WO2018211941A1 - Accumulateur et son procédé de fabrication - Google Patents

Accumulateur et son procédé de fabrication Download PDF

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Publication number
WO2018211941A1
WO2018211941A1 PCT/JP2018/017054 JP2018017054W WO2018211941A1 WO 2018211941 A1 WO2018211941 A1 WO 2018211941A1 JP 2018017054 W JP2018017054 W JP 2018017054W WO 2018211941 A1 WO2018211941 A1 WO 2018211941A1
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WO
WIPO (PCT)
Prior art keywords
secondary battery
electrode assembly
battery according
precursor
exterior body
Prior art date
Application number
PCT/JP2018/017054
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English (en)
Japanese (ja)
Inventor
堀江　拓也
昌史 樋口
雄二 水口
Original Assignee
株式会社村田製作所
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Filing date
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Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2018211941A1 publication Critical patent/WO2018211941A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a secondary battery and a manufacturing method thereof.
  • the secondary battery has a structure in which an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and an electrolyte are enclosed in an exterior body.
  • an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and an electrolyte are enclosed in an exterior body.
  • lithium ions move between the positive electrode and the negative electrode through the electrolyte, and the battery is charged and discharged.
  • the electrode assembly is accommodated in the exterior body, the electrolyte is injected into the exterior body, the inside of the exterior body is sealed, and the secondary battery precursor is obtained, and then the initial charge is performed. It is common.
  • a solid-electrolyte interface coating (hereinafter referred to as “SEI coating”) is formed on the negative electrode surface to prevent decomposition of electrolyte components on the negative electrode surface when used as a secondary battery, It is known to extend the life of batteries.
  • Patent Document 1 discloses a technique for suppressing the influence of gas generated when a secondary battery is used (that is, during repeated charging and discharging) by making the structure of the secondary battery unique. Yes. Specifically, Patent Document 1 discloses that a rectangular battery element obtained by winding or laminating one or more positive electrodes and negative electrodes through a separator is housed in an outer package made of a laminate film, and heat-sealed after injecting a nonaqueous electrolyte. Discloses a secondary battery 510 obtained by hermetically sealing. More specifically, in Patent Document 1, as a structure of a secondary battery as a final product, as shown in FIG.
  • a space that becomes a gas pocket 502 is provided adjacent to a space 501 that houses a battery element.
  • a secondary battery 510 is disclosed.
  • an easily peelable portion 504 having a peel strength lower than that of the surroundings exists in a part of the heat seal portion 503 between both spaces.
  • gas generated by charging and discharging for 500 cycles or more moves to the gas pocket, so that long-term cycle stability is improved.
  • the inventors of the present invention collect the gas generated in the initial charging step by making the structure of the secondary battery precursor unique in the method of manufacturing a secondary battery, thereby preventing charging unevenness due to bubbles. Tried to prevent technology.
  • an electrode assembly 601 including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode and having a rectangular shape in a plan view has a dimension larger than that of the rectangular shape as shown in FIG. 13A.
  • a large exterior body 603 is accommodated, and an electrolyte is injected into the exterior body.
  • the secondary battery precursor 610 obtained by sealing the opening of the exterior body to form the seal portion 604 is initially charged.
  • the secondary battery precursor 610 has a gas pocket 602 that contacts the entire rectangular side of the electrode assembly 601.
  • the secondary battery precursor 610 is disposed such that the gas pocket 602 is positioned above the accommodating portion of the electrode assembly 601 in the vertical direction as shown in FIG. 13B.
  • the gas generated in the initial charging step is collected in the gas pocket 602, and uneven charging due to bubbles is prevented.
  • FIG. 13C after sealing the boundary between the accommodating portion of the electrode assembly 601 in the secondary battery precursor and the gas pocket 602 to form the seal portion 605, the gas pocket 602 is separated.
  • the secondary battery precursor 600 can be obtained.
  • an electrode assembly 701 having a notch in a plan view is accommodated in a rectangular exterior body 703 having a size larger than that of the electrode assembly.
  • the electrode assembly 701 includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode.
  • a seal portion 704a is formed in the exterior body 703 according to the shape of the electrode assembly 701, and a portion corresponding to the notch in the secondary battery is cut.
  • a seal portion 704a may be formed on an exterior body that has been cut in advance so as to correspond to the shape of the electrode assembly 701.
  • the secondary battery precursor 710 normally has a gas pocket 702 at the upper end of the maximum height portion 701 a of the electrode assembly 701 in the secondary battery precursor 710.
  • the height is the height of the electrode assembly 701 in the secondary battery precursor when used in the initial charging step. Since the electrode assembly 701 has a cutout portion, the electrode assembly 701 includes two or more components having different heights, that is, a maximum height portion 701a and a non-maximum height portion 701b.
  • the secondary battery precursor 710 is disposed such that the gas pocket 702 is located above the maximum height portion 701a of the electrode assembly 701 as shown in FIG. 14C.
  • the gas pocket 702 is By separating, the secondary battery 700 is obtained.
  • the gas generated in the maximum height portion 701a of the electrode assembly 701 in the initial charging step is stored in the gas pocket 702 as shown in FIG. 14C. It is collected and charging unevenness due to bubbles is prevented. However, as shown in FIG. 14C, the gas generated in the non-maximum height portion 701b causes a gas pool in the upper portion 720 of the non-maximum height portion 701b. could not be prevented sufficiently.
  • An object of the present invention is to provide a method of manufacturing a secondary battery that can more fully prevent uneven charging due to bubbles in the entire secondary battery even when the secondary battery has a notch.
  • Another object of the present invention is to provide a secondary battery in which uneven charging due to air bubbles is more sufficiently prevented in the entire secondary battery even when the secondary battery has a notch.
  • the present invention Initial charging of a secondary battery precursor including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and having a notch in a plan view and an electrolyte sealed in an exterior body
  • a method of manufacturing a secondary battery including a step of:
  • the present invention relates to a method for manufacturing a secondary battery, in which the initial charging is performed while releasing gas generated in the electrode assembly in at least a notch portion of the electrode assembly in the secondary battery precursor.
  • the present invention also provides An electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode and an electrolyte are enclosed in an exterior body, and a secondary battery having a notch in a plan view,
  • the present invention relates to a secondary battery having a first seal part containing an electrolyte component in at least a part of a side A adjacent to the notch among the sides constituting the outer edge of the secondary battery in plan view.
  • the method for manufacturing a secondary battery of the present invention even if the secondary battery and the electrode assembly included in the secondary battery have a notch, charging unevenness due to bubbles in the entire secondary battery precursor is achieved.
  • the initial charging can be performed while preventing the above problem more sufficiently. For this reason, in the initial charging step, charging unevenness due to bubbles is more sufficiently prevented over the entire surface of the negative electrode surface, so that the SEI film is formed with a more uniform thickness.
  • precipitation of lithium is more sufficiently prevented, so that safety is improved and a decrease in battery capacity is prevented.
  • FIG. 3 is a schematic plan view of a secondary battery for explaining a secondary battery and a missing step for obtaining the secondary battery in the first embodiment of the present invention.
  • FIG. It is a schematic plan view of the secondary battery for demonstrating the missing process for obtaining the secondary battery and the said secondary battery in the 2nd embodiment of this invention. It is a typical top view of the exterior body containing an electrode assembly which shows the accommodation process to the exterior body of the electrode assembly in the manufacturing method of the secondary battery which concerns on the 3rd embodiment of this invention.
  • FIG. It is a schematic plan view of the secondary battery for demonstrating the missing process for obtaining the secondary battery and the said secondary battery in the 3rd embodiment of this invention.
  • FIG. It is a typical top view of the exterior body containing an electrode assembly which shows the accommodation process to the exterior body of the electrode assembly in the manufacturing method of the secondary battery concerning the 4th embodiment of the present invention.
  • FIG. It is a schematic plan view of the secondary battery for demonstrating the missing process for obtaining the secondary battery and the said secondary battery in the 4th embodiment of this invention.
  • FIG. It is a typical top view of the exterior body containing an electrode assembly which shows the accommodation process to the exterior body of the electrode assembly in the manufacturing method of the secondary battery concerning the 5th embodiment of the present invention.
  • FIG. It is a schematic plan view of the secondary battery for demonstrating the missing process for obtaining the secondary battery and the said secondary battery in the 5th embodiment of this invention.
  • FIG. It is a typical top view of the exterior body containing an electrode assembly which shows the accommodation process to the exterior body of the electrode assembly in the manufacturing method of the secondary battery concerning the 6th embodiment of the present invention.
  • FIG. It is a schematic plan view of the secondary battery for demonstrating the missing process for obtaining the secondary battery and the said secondary battery in the 6th embodiment of this invention.
  • FIG. 1 It is a schematic plan view of the secondary battery for demonstrating the missing process for obtaining the secondary battery and the said secondary battery in the 7th embodiment of this invention. It is a typical top view of the exterior body containing an electrode assembly which shows the accommodation process to the exterior body of the electrode assembly in the manufacturing method of the secondary battery concerning the 8th embodiment of the present invention.
  • Secondary battery precursor for explaining a secondary battery precursor, an injection process for obtaining the secondary battery precursor, and an initial charging process using the secondary battery precursor in the eighth embodiment of the present invention FIG.
  • FIG. 1 It is a schematic plan view of the secondary battery for demonstrating the missing process for obtaining the secondary battery and the said secondary battery in the 8th embodiment of this invention.
  • FIG. 1 shows the accommodation process to the exterior body of the electrode assembly in the manufacturing method of the rechargeable battery concerning the 9th embodiment of the present invention.
  • Secondary battery precursor for explaining a secondary battery precursor, an injection process for obtaining the secondary battery precursor, and an initial charging process using the secondary battery precursor in the ninth embodiment of the present invention.
  • FIG. It is a typical top view of a secondary battery for explaining the omission process for obtaining the secondary battery in the 9th embodiment of the present invention, and the secondary battery concerned.
  • FIG. 10 It is a typical top view of the exterior body containing an electrode assembly which shows the accommodation process to the exterior body of the electrode assembly in the manufacturing method of the secondary battery which concerns on the 10th embodiment of this invention.
  • Secondary battery precursor for explaining a secondary battery precursor, an injection process for obtaining the secondary battery precursor, and an initial charging process using the secondary battery precursor in the tenth embodiment of the present invention.
  • FIG. It is a schematic plan view of the secondary battery for demonstrating the missing process for obtaining the secondary battery and the said secondary battery in the 10th embodiment of this invention.
  • tool for demonstrating an example of the restraining method of a secondary battery precursor is shown.
  • FIG. 14 is a schematic plan view of a secondary battery and a gas pocket for explaining a secondary battery using the secondary battery precursor of FIG. 13B and a missing step for obtaining the secondary battery. It is a typical top view of the exterior body containing an electrode assembly which shows another example of the accommodation process to the exterior body of an electrode assembly.
  • 14B is a schematic plan view of the exterior body including the electrode assembly, showing a process of adapting the exterior body to the electrode assembly shape using the exterior body including the electrode assembly of FIG. 14A. 14B for explaining a secondary battery precursor using an outer package including the electrode assembly of FIG. 14B, an injection process for obtaining the secondary battery precursor, and an initial charging process using the secondary battery precursor.
  • It is a schematic plan view of a secondary battery precursor. It is a typical top view of a secondary battery and a gas pocket for demonstrating the missing process for obtaining the secondary battery using the secondary battery precursor of FIG. 14C, and the said secondary battery.
  • the present invention provides a method for manufacturing a secondary battery.
  • the term “secondary battery” refers to a battery that can be repeatedly charged and discharged. Therefore, the “secondary battery” is not excessively bound by the name, and may include, for example, “electric storage device”.
  • the “secondary battery precursor” to be described later refers to an intermediate body or intermediate structure of a secondary battery obtained by enclosing the electrode assembly and the electrolyte in an exterior body before the initial charging step.
  • the “electrode assembly” is an electrode structure including a positive electrode, a negative electrode, and a separator.
  • initial charging is performed while letting the gas generated in the electrode assembly escape at least to the notch of the electrode assembly. That is, the initial charging process is performed while causing at least a portion of the secondary battery precursor corresponding to the notch of the electrode assembly to function as a so-called gas pocket.
  • the gas generated in the electrode assembly in the secondary battery precursor in the initial charging step is collected in the notch.
  • the gas can escape at least to the notch portion of the electrode assembly in the secondary battery precursor.
  • the boundary between the electrode assembly and the electrode assembly is simply sealed (sometimes referred to as “at least the corresponding portion of the secondary battery precursor”).
  • at least the notch corresponding portion of the secondary battery precursor is removed. Since at least the boundary between the electrode assembly and the portion corresponding to the notch portion of the secondary battery precursor includes two sheets constituting the outer package and the electrolyte between the two sheets, it is formed by the seal.
  • the seal portion includes an electrolyte component. Such a seal portion containing an electrolyte component is referred to as a “first seal portion”.
  • an electrode assembly and an electrolyte which will be described later, are enclosed in an exterior body.
  • Encapsulation means that the electrode assembly and electrolyte are sealed after being inserted into the outer package.
  • the secondary battery precursor can be manufactured by a process of accommodating the electrode assembly in the exterior body and a step of injecting the electrolyte into the exterior body.
  • the electrode assembly 1 is housed in the exterior body 3 and the outer edge region of the exterior body 3 is injected with an electrolyte. Leave the inlet for sealing.
  • the seal portion formed by the seal in this step does not contain an electrolyte component, and is different from the above “first seal portion” containing the electrolyte component.
  • Such a seal portion that does not contain an electrolyte component is referred to as a “second seal portion” and is denoted by reference numeral “1a” in the drawing.
  • 1A to 10A include “FIGS. 1A, 2A, 3A,..., And FIG.
  • FIGS. 3C-5C include FIGS. 3C, 4C and 5C.
  • sealing is usually performed on at least three outer peripheral areas of the outer package 3 as shown in FIGS. 1A to 10A when the outer package 3 has a rectangular shape in plan view.
  • the outer package 3 is composed of two separated films, but the two films may be continuous.
  • the electrode assembly 1 includes a positive electrode, a negative electrode, and a separator, and the positive electrode and the negative electrode are alternately arranged via the separator.
  • the two external terminals 5 included in the electrode assembly 1 are usually connected to electrodes (positive electrode or negative electrode) via current collecting leads, and as a result, are led out from the exterior body.
  • the electrode assembly 1 may have a planar laminated structure in which a plurality of electrode units (electrode constituent layers) including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode are laminated in a planar shape.
  • the structure of the electrode assembly is not limited to a planar laminated structure.
  • a winding structure in which an electrode unit (electrode constituent layer) including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode is wound in a roll shape.
  • the electrode assembly may have a so-called stack and folding structure in which a positive electrode, a separator, and a negative electrode are stacked on a long film and then folded.
  • the electrode assembly 1 preferably has a planar laminated structure from the viewpoint of more sufficiently preventing uneven charging due to bubbles in the entire secondary battery precursor.
  • the electrode assembly 1 has a notch 10 in plan view.
  • the plan view is a state when an object (for example, an electrode assembly, a secondary battery precursor or a secondary battery) is placed and viewed from directly above its thickness (height) direction, It is a plan view and agreement.
  • the notch 10 is a portion that can be recognized from the electrode assembly and the secondary battery, and has an initial shape of the electrode assembly and the secondary battery in a plan view (for example, an irregular shape that the electrode assembly and the secondary battery have) Is a portion in which a part of the rectangle is finally lost.
  • the notch 10 is a portion remaining after subtracting the irregular shapes of the electrode assembly and the secondary battery from the minimum rectangular shape.
  • the initial shape before the formation of the notch is usually rectangular.
  • the rectangular shape usually includes a rectangular shape and a square shape.
  • 1A to 10A have a rectangular shape (particularly rectangular shape), but are not particularly limited.
  • a rectangular shape square shape
  • a triangular shape a fan shape
  • a semicircular shape a circular shape, etc. may be sufficient.
  • the electrode assembly 1 When the electrode assembly 1 has the cutout portion 10 in a plan view, the overall shape (different shape) of the electrode assembly 1 is reflected, and the secondary battery 100 as the final product is also shown in FIGS. 1C to 10C. As shown in FIG. 4, the cutout portion 10 is provided in a plan view.
  • the notch 10 is literally a notch, and thus is a portion where nothing exists.
  • 1C to 10C include “FIG. 1C, FIG. 2C, FIG. 3C,..., And FIG. 10C”, and the secondary battery and the secondary battery according to the first to tenth embodiments of the present invention, respectively. It is a typical top view of a secondary battery for explaining the below-mentioned missing process for obtaining a battery.
  • the sealing method in the housing step is not particularly limited as long as the electrolyte does not leak from the formed seal portion.
  • the sealing may be achieved by a heat sealing method.
  • the sealing may be achieved by a laser welding method.
  • the boundary 11 (including 11x and 11y) between the electrode assembly 1 and the cutout portion 10 in the outer package 3 is not sealed, but is shown in FIGS. 7A to 10A.
  • the seal portion formed by the seal in this step is a seal portion 1a that does not contain an electrolyte component. If the entire boundary is sealed, the gas generated in the initial charging process described later cannot be released to the notch 10 and charging unevenness cannot be sufficiently prevented.
  • the following methods (m1) to (m2) are preferred: (M1) When the boundary 11 is defined by a plurality of line segments, as shown in FIGS. 7A to 9A, a method of sealing at least a part of one line segment among the plurality of line segments; or ( m2) A method in which, when the boundary 11 is defined by a plurality of line segments, a part of each of the two line segments among the plurality of line segments is sealed as shown in FIG. 10A.
  • the method (m1) is more preferable. .
  • the method (m1) as shown in FIGS. 7A and 9A, at least a part of one longest line segment 11x is sealed among the plurality of line segments.
  • the method (m1), as shown in FIGS. 7A and 9A at least a part of one longest line segment 11x is sealed, and thereafter
  • the secondary battery precursor obtained through the injecting step is initially charged by arranging the longest line segment 11x so as to be substantially parallel to the vertical direction.
  • the exterior body 3 usually has a rectangular shape in plan view as shown in FIGS. 1A to 10A.
  • the dimensions of the exterior body 3 are the initial shape of the electrode assembly 1 before the formation of the notch (hereinafter simply referred to as “electrode assembly”). It may have dimensions that are substantially the same as the dimensions of the rectangular shape (referred to as “the initial shape of the solid 1”).
  • the dimension of the exterior body 3 is substantially the same as the rectangular dimension as the initial shape of the electrode assembly 1, as shown in FIGS. 1D and 6D. When the width is not considered, the dimensions in both the width direction and the vertical direction are substantially the same.
  • FIGS. 1A, 2A, 6A, 7A, 8A, and 10A the dimensions of the exterior body 3 are the initial shape of the electrode assembly 1 before the formation of the notch (hereinafter simply referred to as “electrode assembly”). It may have dimensions that are substantially the same as the dimensions of the rectangular shape (referred to as “the initial shape of the solid 1”).
  • 1D and 6D are views for explaining an electrode assembly, a cutout portion and a missing portion, and an arrangement thereof in an exterior body including the electrode assembly in the first embodiment and the sixth embodiment of the present invention, respectively. It is a typical plane arrangement view of an exterior body containing an electrode assembly. The outer edge in these figures corresponds to the exterior body.
  • the dimensions of the exterior body 3 may also be larger than the rectangular dimension as the initial shape of the electrode assembly 1, as shown in FIGS. 3A, 4A, 5A and 9A. That the dimension of the exterior body 3 is larger than the rectangular dimension as the initial shape of the electrode assembly 1 is because the dimension in at least one of the width direction and the longitudinal direction is larger. As shown in FIGS. 3D, 4D, 5D, and 9D, in the plan view of the exterior body that includes the electrode assembly, an excess portion 20 is generated in addition to the housing portion 1 and the cutout portion 10 of the electrode assembly. Say. 3D, FIG. 4D, and FIG.
  • 5D respectively show the electrode assembly, the cutout portion, the surplus portion, and the lack in the exterior body including the electrode assembly in the third embodiment, the fourth embodiment, and the fifth embodiment of the present invention. It is a typical plane arrangement view of the exterior body containing an electrode assembly for explaining a portion and those arrangements. The outer edge in these figures corresponds to the exterior body.
  • the missing portion 30 includes the cutout portion corresponding portion 10a and the surplus portion 20 in the outer package 3 and the secondary battery precursor 50, and when the surplus portion does not occur, the missing portion 30 includes only the cutout portion corresponding portion 10a. Also good.
  • the missing part 30 is a part that should be missing in the missing process, and does not constitute a secondary battery as a final product.
  • the missing part 30 is a part that can be recognized from the secondary battery precursor in the manufacturing method of the secondary battery, and in order to obtain the expected shape of the secondary battery (shape of the electrode assembly) in plan view, It is a part that finally loses a part from the shape (for example, rectangular shape) of the battery precursor.
  • the missing part 30 is usually a part that is left by subtracting the irregular shape of the electrode assembly from the shape (for example, rectangular shape) of the secondary battery precursor.
  • the dimension of the exterior body 3 is larger than the rectangular dimension as the initial shape of the electrode assembly 1 from the viewpoint of more sufficiently preventing uneven charging due to bubbles in the entire secondary battery precursor in the initial charging step. It is preferable to have.
  • a surplus portion of the exterior body 3 (hereinafter, simply referred to as “a” is caused by the fact that the dimension of the exterior body 3 is larger than the rectangular dimension as the initial shape of the electrode assembly 1). This is because the “excess portion of the outer package 3” 20) can function as a gas pocket in the initial charging step, like the notch corresponding portion 10a of the secondary battery precursor 50.
  • the arrangement of the electrode assembly 1 in the outer package 3 is a surplus of the outer package 3 from the viewpoint of further prevention of charging unevenness in the initial charging process and more efficient impregnation of the electrolyte into the electrode assembly in the injection process.
  • the arrangement is preferably such that the portion 20 is continuous with the notch corresponding portion 10a of the secondary battery precursor 50 in plan view.
  • the following embodiments n1 and n2 are more preferable, and the embodiment n2 is most preferable. :
  • an electrolyte is injected into the outer package 3 containing the electrode assembly 1 from the injection port, and the outer package 3
  • the injection port can be further sealed to obtain the secondary battery precursor 50. Since the seal portion formed by the seal in this step is positioned at the injection port, it is a seal portion that does not contain an electrolyte component, and is indicated by “1b”. Even if the electrolyte is attached to the inlet, the initial charging step is not performed, and therefore the seal portion formed by the seal in this step is a seal portion that does not contain an electrolyte component.
  • 1B to 10B respectively show the secondary battery precursor, the injection step for obtaining the secondary battery precursor, and the initial stage using the secondary battery precursor in the first to tenth embodiments of the present invention. It is a typical top view of a secondary battery precursor for explaining a charge process.
  • the injection method is not particularly limited as long as the injection of the electrolyte into the outer package and the impregnation of the electrolyte into the electrode assembly are achieved.
  • a method of guiding the electrolyte into the exterior body using a nozzle or the like can be mentioned.
  • the sealing of the inlet is performed while maintaining the inside of the exterior body in a reduced pressure state to form the seal portion 1b. This is because the removal of air from the inside of the exterior body is promoted.
  • the sealing method in the injection process may be the same as the sealing method in the housing process.
  • the atmospheric pressure inside the outer package at the time of sealing is usually in the range of 1 kPa to 20 kPa, preferably in the range of 5 kPa to 12 kPa.
  • the notch corresponding portion 10a that is, the notch corresponding portion 10a when the surplus portion 20 is not formed; or the surplus portion 20 is formed.
  • the two films constituting the outer package 3 are in contact with each other so as to be detachable from each other with or without an electrolyte. Therefore, at least the exterior body 3 is present in the notch corresponding portion 10 a and the surplus portion 20 in the secondary battery precursor 50.
  • the secondary battery precursor 50 may have a step portion in a side view.
  • the step portion is a discontinuous portion of the upper surface that is configured by two upper surfaces having different heights in a side view, and the height of the steps locally changes between the two upper surfaces.
  • the side view is a state when an object (for example, a secondary battery precursor) is placed and viewed from the side in the thickness (height) direction, and is in agreement with the side view.
  • the initial charging step is an initial charging step of the secondary battery precursor performed for the purpose of forming an SEI film on the negative electrode surface, and is also referred to as an initial charging step, a conditioning step, or a formation step.
  • the SEI coating is formed by reducing and decomposing the additive contained in the electrolyte in the present step on the negative electrode surface, and prevents further decomposition of the additive on the negative electrode surface during use as a secondary battery.
  • the SEI coating typically includes one or more materials selected from the group consisting of LiF, Li 2 CO 3 , LiOH, and LiOCOOR (R represents a monovalent organic group such as an alkyl group).
  • initial charging is performed using at least the secondary battery precursor 50 having the notch corresponding portion 10a (preferably the secondary battery precursor 50 having the notch corresponding portion 10a and the surplus portion 20). .
  • initial charging can be performed while letting the gas generated in the electrode assembly in the secondary battery precursor 50 escape to at least the notch corresponding part 10a (preferably the notch corresponding part 10a and the surplus part 20).
  • the initial charging step is performed while at least the notch corresponding portion 10a (preferably the notch corresponding portion 10a and the surplus portion 20) of the secondary battery precursor functions as a so-called gas pocket.
  • the gas generated in the electrode assembly in the initial charging step is collected at least in the notch corresponding portion 10a (preferably the sum of the notch corresponding portion 10a and the surplus portion 20).
  • the gas can be released to at least the notch corresponding portion 10a (preferably the total portion of the notch corresponding portion 10a and the surplus portion 20).
  • the arrangement of the secondary battery precursor 50 is not particularly limited, and initial charging may be performed in a state where the secondary battery precursor 50 is placed on a horizontal plane.
  • the placement is placement with the surface (plane) having the maximum area constituting the appearance of the object (for example, the secondary battery precursor) as the bottom surface.
  • the missing portion 30 at least the notch corresponding portion 10a, preferably the notch corresponding portion 10a and the surplus portion 20
  • the secondary battery precursor 50 is another portion. It is preferable to arrange the secondary battery precursor 50 and perform initial charging so as to be relatively higher than that.
  • the missing portion 30 (at least the notch corresponding portion 10a, preferably the notch corresponding portion 10a and the surplus portion 20) of the secondary battery precursor 50. Will function more fully as a gas pocket. As a result, charging unevenness due to bubbles is more sufficiently prevented over the entire surface of the negative electrode surface.
  • Sides constituting the outer edge of the secondary battery precursor 50 are sides 50a to 50f as shown in FIGS. 1B to 10B (hereinafter, refer to the drawings for the sides) showing the plan views of the secondary battery precursor 50. That is.
  • the side that does not define the missing portion 30 is a side that does not include the side that defines the outer edge of the missing portion 30 among the sides that constitute the outer edge of the secondary battery precursor 50.
  • the sides 50a and 50b include Can be mentioned.
  • the side that includes the side that defines the missing part 30 at a minimum includes the side that defines the outer edge of the missing part 30 among the sides that constitute the outer edge of the secondary battery precursor 50, but the length of the side.
  • the side having the smallest ratio (ratio to the total length of the side) is, for example, the side 50c.
  • the minimum is the minimum among the sides constituting the outer edge of the secondary battery precursor 50.
  • the secondary battery precursor 50 has a side that does not define the missing portion 30 of the missing step as a side constituting the outer edge of the secondary battery precursor 50 in plan view, FIG. 1B to FIG. 3B and FIG. As shown in FIGS. 5B to 10B, the side where the missing portion 30 is not defined is arranged so as to be lower than the other sides.
  • the secondary battery precursor 50 has two or more sides that do not define the missing part 30 of the missing process, further prevention of uneven charging in the initial charging process and application of the electrolyte to the electrode assembly in the injection process From the viewpoint of a balance with more efficient impregnation, as shown in FIGS. 1B to 3B, FIG. 5B, and FIGS.
  • the shortest side among the sides not defining the missing portion 30 is more than the other sides. Is preferably arranged so as to be low. This is because the secondary battery precursor obtained in the above-described injection step is used for the initial charging step as it is in the arrangement (orientation) in the injection step.
  • the secondary battery precursor 50 does not have a side that does not define the missing portion 30 of the missing step as a side constituting the outer edge of the secondary battery precursor 50 in a plan view, as shown in FIG. 4B.
  • the side including the side defining the missing portion 30 at the minimum is arranged so as to be lower than the other sides.
  • arranging one side p constituting the outer edge of the secondary battery precursor 50 to be lower than the other side means that the side p is parallel to the horizontal plane and from the other side. Is positioned at the lowest position, meaning that the secondary battery precursor 50 is at least inclined, preferably upright, and erected.
  • the initial charging is usually preferably performed while restraining the secondary battery precursor. Since the restraint is tightening from the outside by pressure for the secondary battery precursor, in other words, pressurization to the surface of the secondary battery precursor, in a broad sense, “tightening” or “pressurization”. I can also say.
  • the method for constraining the secondary battery precursor is not particularly limited as long as pressurization in the stacking direction (thickness direction) of the electrode assembly in the secondary battery precursor is achieved.
  • FIG. A method using tools is mentioned. Specifically, as shown in FIG. 11, initial charging is performed while restraining the secondary battery precursor 50 by applying a restraining force in the thickness direction z of the electrode in the secondary battery precursor 50 by the restraining jig 200. Do. According to such a method, bubbles are further prevented from adhering to the electrode surface of the secondary battery precursor 50, and the formation of the SEI film having a uniform thickness is promoted.
  • the restraining jig 200 applies a restraining force in the z direction to the one or more secondary battery precursors 50 via the restraining plate 205 between the movable plate 202 and the fixed plate 203 by the rotation of the bolt 201. It is supposed to be.
  • the binding force (that is, the pressure on the surface of the secondary battery precursor) is not particularly limited as long as the gas generated in this step is prevented from adhering to the negative electrode surface, and is usually a pressure higher than atmospheric pressure.
  • the binding force is usually in the range of 0.1 MPa or more and 1.0 MPa or less, and preferably in the range of 0.1 MPa or more and 0.5 MPa or less from the viewpoint of further preventing the gas from adhering to the negative electrode surface. .
  • the secondary battery precursor is preferably maintained at a temperature in the range of 25 ° C. or higher and 100 ° C. or lower, more preferably 35 ° C. or higher and 90 ° C., from the viewpoint of further preventing gas from adhering to the negative electrode surface. It is maintained at a temperature within the following range, more preferably 40 ° C. or more and 85 ° C. or less. Specifically, the ambient (atmosphere) temperature where the secondary battery precursor is arranged in this step may be maintained within the above range.
  • the gas generated in the electrode assembly in the secondary battery precursor 50 is at least a notch portion (notch portion corresponding portion 10a, preferably notch portion corresponding portion 10a and surplus portion 20). )
  • charging may be performed at least once.
  • charge and discharge is performed at least once.
  • One charge / discharge includes one charge and one subsequent discharge. If charging / discharging is performed twice or more, the charging-discharging is repeated the corresponding number of times.
  • the initial charging performed while releasing the generated gas may be performed at least during the first charging, and is preferably performed during all charging and discharging.
  • the charging method may be a constant current charging method or a constant voltage charging method, or a combination thereof. For example, constant voltage charging and constant voltage charging may be repeated during one charge.
  • the charging conditions are not particularly limited as long as the SEI film is formed. From the viewpoint of further improving the uniformity of the thickness of the SEI film, it is preferable to perform constant voltage charging after performing constant current charging. When performing constant voltage charging after performing constant current charging, it is preferable to employ the following charging conditions from the viewpoint of further improving the uniformity of the SEI film thickness.
  • the temperature at the time of charge should just be in the range similar to the temperature of the above-mentioned secondary battery precursor.
  • Constant current charging method Constant current charging is performed until a voltage value of 1 V or more and 6 V or less, particularly 3 V or more and 5 V or less at a constant current value of 0.01 CA or more and 3 CA or less, particularly 0.05 CA or more and 2 CA or less.
  • 1CA is a current value when the rated capacity of the secondary battery is discharged in 1 hour.
  • Constant voltage charging method The constant voltage charging is performed until the voltage value achieved by the constant current charging reaches a predetermined value smaller than the constant current value at the time of constant current charging or until a predetermined time elapses.
  • the discharge method may be a constant current discharge method, a constant voltage discharge method, or a combination thereof.
  • the discharge conditions are not particularly limited as long as the SEI film is formed. From the viewpoint of further improving the uniformity of the thickness of the SEI film, it is preferable to perform constant current discharge. When performing constant current discharge, it is preferable to employ the following discharge conditions from the viewpoint of further improving the uniformity of the SEI film thickness.
  • the temperature at the time of discharge may be in the same range as the temperature of the secondary battery precursor described above, or may be a temperature lower than that at the time of charging.
  • Constant current discharge method Constant current discharge is performed at a constant current value of 0.1 CA or more and 3 CA or less, particularly 0.2 CA or more and 2 CA or less until a voltage value of 1 V or more and 4 V or less, particularly 2 V or more and 3.5 V or less.
  • a missing process is usually performed.
  • the boundary for performing sealing in this step is normally the boundary between the notch corresponding part 10a and the electrode assembly 1 when the missing part 30 is composed of only the notch corresponding part 10a, and the missing part 30 is notched.
  • the portion corresponding portion 10 a and the surplus portion 20 it is a boundary between the total portion and the electrode assembly 1.
  • the seal part containing the electrolyte component is referred to as a “first seal part”, and is denoted by reference numeral “1c” in the drawing.
  • the sealing method in the missing step may be the same as the sealing method in the housing step.
  • the secondary battery 100 is usually obtained by removing at least the notch 10 in the secondary battery precursor 50.
  • the part to be lost in this step is normally the notch corresponding part 10a when the missing part 30 is composed of only the notch corresponding part 10a, and the missing part 30 is from the notch corresponding part 10a and the surplus part 20. Is the sum of those parts.
  • the omission method is not particularly limited as long as electrolyte leakage from the obtained secondary battery 100 does not occur, and examples thereof include a method of cutting with a cutter or the like.
  • An aging process may be performed.
  • the aging process may be performed after the missing process, or after the initial charging process and before the missing process.
  • the aging step and the missing step are performed in this order.
  • the aging process is a process of stabilizing the SEI film by leaving the secondary battery after the initial charging process in an open circuit state.
  • the aging process is also called an aging process.
  • the temperature of the secondary battery is not particularly limited, and may be maintained within a range of 15 ° C. or more and 80 ° C. or less, for example.
  • the secondary battery is preferably maintained at a temperature in the range of 20 ° C. or more and 70 ° C. or less, more preferably 25 ° C. or more and 60 ° C. or less, from the viewpoint of further stabilization of the SEI coating.
  • the temperature can be maintained within the above range by leaving the secondary battery in a space set at a constant temperature.
  • the standing time in the aging step is not particularly limited as long as the stabilization of the SEI film is promoted, and is usually 1 hour or more and 30 days or less, and preferably 5 hours or more and 14 days or less from the viewpoint of further stabilization of the SEI film. More preferably, it is in the range of 10 hours or more and 7 days or less.
  • the secondary battery 100 of the present invention is manufactured by removing the missing portion 30 after sealing in the missing step in the above-described method. Therefore, as shown in FIGS. 1C to 10C, the secondary battery 100 has at least a part of the side A adjacent to the notch 10 in the sides constituting the outer edge of the secondary battery 100 in a plan view.
  • the first seal portion 1c containing an electrolyte component is included. This means that when the secondary battery has a notch, the secondary battery precursor of the secondary battery was subjected to initial charging and then sealed, and at least the notch corresponding part was missing. Therefore, the portion corresponding to the notch portion of the secondary battery precursor functions as a gas pocket in the initial charging step.
  • the side A corresponds to the planar view shape of the notch 10 and may have, for example, a straight line shape, a curved line shape, or a mixed form thereof. It may be.
  • the side A may be formed by two or more continuous sides, and each side may have the above-mentioned form selected independently. Two consecutive straight-form sides may be distinguished by forming an angle between them. The angle is the smaller of the angles formed by the two linear sides. The angle may be greater than 0 ° and less than 180 °, usually 30 ° to 150 °, particularly 60 ° to 120 °. Two consecutive curved edges may be distinguished by forming an inflection point between them.
  • One continuous straight line side and one curved line side may be distinguished from the boundary between the straight line form and the curved line that are clearly distinguished.
  • the secondary battery 100 may have the first seal portion 1c on the entire side A adjacent to the notch portion.
  • the secondary battery 100 may have a first seal portion 1c in a part of the side A adjacent to the notch portion 10.
  • the secondary battery 100 includes, for example, a secondary battery as shown in FIGS. 3C to 5C and 9C. It is preferable to have the 1st seal
  • the side B having the first seal portion 1c of the secondary battery may be at least one side B, usually one side B, of the two sides B continuous with the side A.
  • the side B where the secondary battery has the first seal portion 1c may have the first seal portion 1c as a part thereof, or the first seal portion 1c as a whole (all). Preferably, it has the 1st seal
  • the first seal portion 1c on the side A and the first seal portion on the side B It is preferable that 1c is continuous.
  • the secondary battery 100 may include the first seal portion 1c on one of the sides B that are continuous with the side A.
  • the first seal portion on the side A and the first seal portion on the side B are continuously formed. Preferably it is.
  • the secondary battery 100 has a side that constitutes the outer edge of the secondary battery as shown in FIG. 4C, for example.
  • the first seal portion 1 c on the side C further continuous with the side B.
  • the presence of the first seal portion 1c in the side C indicates the presence of a surplus portion in the secondary battery precursor 50, and the surplus portion functions as a gas pocket, whereby charging unevenness in the initial charging process is more sufficiently prevented.
  • the side C where the secondary battery has the first seal portion 1c may have the first seal portion 1c as a part thereof, or the first seal portion 1c as a whole (all).
  • the secondary battery 100 has the 1st seal
  • the first seal portion 1c on the side B and the first seal portion 1c on the side C are provided. It is preferable that it is continuous.
  • the secondary battery 100 may have the first seal portion 1 c on all of one side C continuous with the side B.
  • the first seal portion on the side B and the first seal portion on the side C are continuous. preferable.
  • the secondary battery 100 normally includes a second part that does not contain an electrolyte component in a part other than the part having the first seal portion 1c among the sides constituting the outer edge of the secondary battery. It has seal parts 1a and 1b.
  • the secondary battery 100 has an outer edge of the secondary battery as shown in FIGS. 7C to 10C from the viewpoint of forming a SEI film having a more uniform thickness based on further improvement of the stability of the electrode assembly in the injection process. It is preferable to have the 2nd seal
  • the side A is defined by a plurality of line segments, for example, as shown in (p1) FIG. 7C to FIG.
  • the seal portion 1a may be included, or (p2) the second seal portion 1a may be provided in a part of each of the two line segments as shown in FIG. 10C. Good.
  • the embodiment (p1) is preferable for the secondary battery 100.
  • the second seal portion 1a is provided on at least a part of one longest line segment among the plurality of line segments. It is more preferable.
  • the first seal portion 1c contains an electrolyte component
  • the second seal portions 1a and 1b do not contain an electrolyte component.
  • the phrase “the first seal portion 1c contains an electrolyte component” means that the electrolyte component is contained and sandwiched between two exterior body sheets constituting the first seal portion 1c.
  • a molten component for a flexible pouch
  • a molten (metal) component for a hard case
  • An electrolyte component is contained therein.
  • the fact that the second seal part 1a, 1b does not contain an electrolyte component means that no electrolyte component is contained between the two exterior body sheets constituting the second seal part 1a, 1b, but strictly contains It does not mean that it is not made, but means that it is relatively hardly contained as compared with the first seal part 1c.
  • the content of the electrolyte component can be confirmed by subjecting the molten component in the seal portion to elemental analysis.
  • the ratio R of the total amount (total number) of atoms for example, Li atom, F atom, P atom and B atom
  • the ratio R in the second seal portions 1a and 1b is usually 1/5 or less, particularly 1/10 or less, of the ratio R in the first seal portion 1c.
  • the positive electrode is composed of at least a positive electrode material layer and a positive electrode current collector (foil), and it is sufficient that the positive electrode material layer is provided on at least one surface of the positive electrode current collector.
  • a positive electrode material layer may be provided on both surfaces of the positive electrode current collector, or a positive electrode material layer may be provided on one surface of the positive electrode current collector.
  • a positive electrode preferable from the viewpoint of further increasing the capacity of the secondary battery is provided with a positive electrode material layer on both surfaces of the positive electrode current collector.
  • the positive electrode material layer contains a positive electrode active material.
  • the negative electrode is composed of at least a negative electrode material layer and a negative electrode current collector (foil), and it is sufficient that the negative electrode material layer is provided on at least one surface of the negative electrode current collector.
  • a negative electrode material layer may be provided on both surfaces of the negative electrode current collector, or a negative electrode material layer may be provided on one surface of the negative electrode current collector.
  • a negative electrode preferable from the viewpoint of further increasing the capacity of the secondary battery is provided with a negative electrode material layer on both surfaces of the negative electrode current collector.
  • the negative electrode material layer contains a negative electrode active material.
  • the positive electrode active material included in the positive electrode material layer and the negative electrode active material included in the negative electrode material layer are materials directly involved in the transfer of electrons in the secondary battery, and are the main materials of the positive and negative electrodes that are responsible for charge / discharge, that is, the battery reaction. is there. More specifically, ions are brought into the electrolyte due to the “positive electrode active material included in the positive electrode material layer” and the “negative electrode active material included in the negative electrode material layer”, and the ions are interposed between the positive electrode and the negative electrode. Then, the electrons are transferred and the electrons are delivered and charged and discharged. As will be described later, the positive electrode material layer and the negative electrode material layer are particularly preferably layers capable of occluding and releasing lithium ions.
  • the secondary battery according to the present invention corresponds to a so-called “lithium ion battery”.
  • the positive electrode active material of the positive electrode material layer is made of, for example, a granular material, and it is preferable that a binder is included in the positive electrode material layer for sufficient contact between the particles and shape retention. Furthermore, it is also preferable that a conductive additive is included in the positive electrode material layer in order to facilitate the transmission of electrons that promote the battery reaction.
  • the negative electrode active material of the negative electrode material layer is made of, for example, a granular material, and it is preferable that a binder is included for sufficient contact and shape retention between the particles, and smooth transmission of electrons that promote the battery reaction. In order to do so, a conductive aid may be included in the negative electrode material layer.
  • the positive electrode material layer and the negative electrode material layer can also be referred to as “positive electrode composite material layer” and “negative electrode composite material layer”, respectively.
  • the positive electrode active material is preferably a material that contributes to occlusion and release of lithium ions.
  • the positive electrode active material is preferably, for example, a lithium-containing composite oxide.
  • the positive electrode active material is preferably a lithium transition metal composite oxide containing lithium and at least one transition metal selected from the group consisting of cobalt, nickel, manganese, and iron. That is, in the positive electrode material layer of the secondary battery according to the present invention, such a lithium transition metal composite oxide is preferably included as a positive electrode active material.
  • the positive electrode active material may be lithium cobaltate, lithium nickelate, lithium manganate, lithium iron phosphate, or a part of those transition metals replaced with another metal. Although such a positive electrode active material may be included as a single species, two or more types may be included in combination.
  • the positive electrode active material contained in the positive electrode material layer is lithium cobalt oxide.
  • the binder that can be included in the positive electrode material layer is not particularly limited, but includes polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene copolymer, and Mention may be made of at least one selected from the group consisting of polytetrafluoroethylene and the like.
  • the conductive auxiliary agent that can be included in the positive electrode material layer is not particularly limited, but carbon black such as thermal black, furnace black, channel black, ketjen black, and acetylene black, graphite, carbon nanotube, and vapor phase growth.
  • the binder of the positive electrode material layer is polyvinylidene fluoride
  • the conductive additive of the positive electrode material layer is carbon black.
  • the binder and conductive additive of the positive electrode material layer are a combination of polyvinylidene fluoride and carbon black.
  • the negative electrode active material is preferably a material that contributes to occlusion and release of lithium ions. From this point of view, the negative electrode active material is preferably, for example, various carbon materials, oxides, or lithium alloys.
  • Examples of various carbon materials of the negative electrode active material include graphite (natural graphite, artificial graphite), hard carbon, soft carbon, diamond-like carbon, and the like.
  • graphite is preferable in that it has high electron conductivity and excellent adhesion to the negative electrode current collector.
  • Examples of the oxide of the negative electrode active material include at least one selected from the group consisting of silicon oxide, tin oxide, indium oxide, zinc oxide, lithium oxide, and the like.
  • the lithium alloy of the negative electrode active material may be any metal that can be alloyed with lithium.
  • Al, Si, Pb, Sn, In, Bi, Ag, Ba, Ca, Hg, Pd, Pt, Te, Zn It may be a binary, ternary or higher alloy of a metal such as La and lithium.
  • a binary, ternary or higher alloy of a metal such as La and lithium.
  • Such an oxide is preferably amorphous in its structural form. This is because deterioration due to non-uniformity such as crystal grain boundaries or defects is less likely to be caused.
  • the negative electrode active material of the negative electrode material layer is artificial graphite.
  • the binder that can be included in the negative electrode material layer is not particularly limited, but is at least one selected from the group consisting of styrene butadiene rubber, polyacrylic acid, polyvinylidene fluoride, polyimide resin, and polyamideimide resin. Can be mentioned.
  • the binder contained in the negative electrode material layer is styrene butadiene rubber.
  • the conductive aid that can be included in the negative electrode material layer is not particularly limited, but carbon black such as thermal black, furnace black, channel black, ketjen black, and acetylene black, graphite, carbon nanotube, and vapor phase growth.
  • Examples thereof include at least one selected from carbon fibers such as carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives.
  • the component resulting from the thickener component for example, carboxymethylcellulose used at the time of battery manufacture may be contained in the negative electrode material layer.
  • the negative electrode active material and the binder in the negative electrode material layer are a combination of artificial graphite and styrene butadiene rubber.
  • the positive electrode current collector and the negative electrode current collector used for the positive electrode and the negative electrode are members that contribute to collecting and supplying electrons generated in the active material due to the battery reaction.
  • a current collector may be a sheet-like metal member and may have a porous or perforated form.
  • the current collector may be a metal foil, a punching metal, a net or an expanded metal.
  • the positive electrode current collector used for the positive electrode is preferably made of a metal foil containing at least one selected from the group consisting of aluminum, stainless steel, nickel and the like, and may be, for example, an aluminum foil.
  • the negative electrode current collector used for the negative electrode is preferably made of a metal foil containing at least one selected from the group consisting of copper, stainless steel, nickel and the like, and may be, for example, a copper foil.
  • the separator is a member provided from the viewpoint of preventing short circuit due to contact between the positive and negative electrodes and holding the electrolyte.
  • the separator can be said to be a member that allows ions to pass while preventing electronic contact between the positive electrode and the negative electrode.
  • the separator is a porous or microporous insulating member and has a film form due to its small thickness.
  • a polyolefin microporous film may be used as the separator.
  • the microporous membrane used as the separator may include, for example, only polyethylene (PE) or only polypropylene (PP) as the polyolefin.
  • the separator may be a laminate composed of “a microporous membrane made of PE” and “a microporous membrane made of PP”.
  • the surface of the separator may be covered with an inorganic particle coat layer and / or an adhesive layer.
  • the surface of the separator may have adhesiveness.
  • Electrolyte helps the movement of metal ions released from the electrodes (positive and negative electrodes).
  • the electrolyte may be a “non-aqueous” electrolyte, such as an organic electrolyte and an organic solvent, or may be a “aqueous” electrolyte containing water.
  • the secondary battery of the present invention is preferably a non-aqueous electrolyte secondary battery in which an electrolyte containing a “non-aqueous” solvent and a solute is used as an electrolyte.
  • the electrolyte may have a form such as liquid or gel (in the present specification, “liquid” non-aqueous electrolyte is also referred to as “non-aqueous electrolyte solution”).
  • a solvent containing at least carbonate is preferable.
  • Such carbonates may be cyclic carbonates and / or chain carbonates.
  • examples of the cyclic carbonates include at least one selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), butylene carbonate (BC), and vinylene carbonate (VC). be able to.
  • examples of the chain carbonates include at least one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), and dipropyl carbonate (DPC).
  • DMC dimethyl carbonate
  • DEC diethyl carbonate
  • EMC ethyl methyl carbonate
  • DPC dipropyl carbonate
  • a combination of cyclic carbonates and chain carbonates is used as the non-aqueous electrolyte, for example, a mixture of ethylene carbonate and diethyl carbonate.
  • Li salts such as LiPF 6 and LiBF 4 are preferably used.
  • Electrolytes particularly non-aqueous electrolytes contain additives such as vinylene carbonate, 1,3-propane sultone, and fluorinated ethylene carbonate.
  • additives such as vinylene carbonate, 1,3-propane sultone, and fluorinated ethylene carbonate.
  • any current collecting lead used in the field of secondary batteries can be used.
  • a current collecting lead may be made of a material capable of achieving electron movement, and is usually made of a conductive material such as aluminum, nickel, iron, copper, and stainless steel.
  • the form of the current collecting lead is not particularly limited, and may be, for example, a linear shape or a plate shape.
  • any external terminal used in the field of secondary batteries can be used.
  • Such an external terminal may be made of a material capable of achieving electron movement, and is usually made of a conductive material such as aluminum, nickel, iron, copper, and stainless steel.
  • the form of the external terminal 5 is not particularly limited, and is usually plate-shaped.
  • the external terminal 5 may be electrically and directly connected to the substrate, or may be electrically and indirectly connected to the substrate via another device.
  • the current collecting lead can also be used as an external terminal.
  • the exterior body is preferably a flexible pouch (soft bag), but may be a hard case (hard housing).
  • the flexible pouch is usually formed from a laminate film, and sealing is achieved by heat-sealing the peripheral edge.
  • the laminate film a film obtained by laminating a metal foil and a polymer film is generally used.
  • a film having a three-layer structure including an outer layer polymer film / metal foil / inner layer polymer film is exemplified.
  • the outer layer polymer film is for preventing damage to the metal foil due to permeation and contact of moisture and the like, and polymers such as polyamide and polyester can be suitably used.
  • the metal foil is for preventing the permeation of moisture and gas, and a foil of copper, aluminum, stainless steel or the like can be suitably used.
  • the inner layer polymer film is for protecting the metal foil from the electrolyte accommodated therein, and for melting and sealing at the time of heat sealing, and polyolefin or acid-modified polyolefin can be suitably used.
  • the thickness of the laminate film is not particularly limited, and is preferably 1 ⁇ m or more and 1 mm or less, for example.
  • the hard case is usually formed from a metal plate, and sealing is achieved by irradiating the peripheral edge with a laser.
  • a metal plate a metal material made of aluminum, nickel, iron, copper, stainless steel or the like is common.
  • the thickness of a metal plate is not specifically limited, For example, 1 micrometer or more and 1 mm or less are preferable.
  • the secondary battery manufactured by the method of the present invention can be used in various fields where power storage is assumed. Although only illustrative, secondary batteries manufactured by the method of the present invention, particularly non-aqueous electrolyte secondary batteries, are used in the electrical / information / communication field (for example, mobile phones, smartphones, smart phones) where mobile devices are used.
  • Mobile devices such as watches, notebook computers, digital cameras, activity meters, arm computers, and electronic paper), home and small industrial applications (eg, power tools, golf carts, home / care / industrial robots) , Large industrial applications (eg, forklifts, elevators, bay harbor cranes), transportation systems (eg, hybrid vehicles, electric cars, buses, trains, electric assist bicycles, electric motorcycles), power system applications (eg, , Various power generation, road conditioner, smart grid, general household installation type storage Areas), IoT areas such system, and can be used for space-deepwater applications (e.g., spacecraft, areas such as submersible).
  • home and small industrial applications eg, power tools, golf carts, home / care / industrial robots
  • Large industrial applications eg, forklifts, elevators, bay harbor cranes
  • transportation systems eg, hybrid vehicles, electric cars, buses, trains, electric assist bicycles, electric motorcycles
  • power system applications eg, Various power generation, road conditioner, smart grid, general household installation type

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Abstract

La présente invention concerne un procédé qui permet de fabriquer un accumulateur, et qui permet d'éviter plus efficacement une charge irrégulière provoquée par des bulles dans l'accumulateur dans son ensemble même lorsque l'accumulateur présente une partie entaillée. Ce procédé de fabrication d'un accumulateur comprend une étape consistant à effectuer une charge initiale d'un précurseur d'accumulateur (50) obtenu par scellement, dans un corps extérieur, d'un électrolyte et d'un ensemble électrode (1) qui présente une partie entaillée dans une vue en plan et qui comprend une électrode positive, une électrode négative, et un séparateur disposé entre l'électrode positive et l'électrode négative. Dans le précurseur d'accumulateur (50), la charge initiale est réalisée pendant qu'un gaz généré dans l'ensemble électrode (1) est éliminé au moins jusqu'à une partie entaillée (10) de l'ensemble électrode (1).
PCT/JP2018/017054 2017-05-19 2018-04-26 Accumulateur et son procédé de fabrication WO2018211941A1 (fr)

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JP2017100110 2017-05-19
JP2017-100110 2017-05-19

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Citations (9)

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JP2016506606A (ja) * 2013-03-04 2016-03-03 エルジー・ケム・リミテッド 欠落部が形成された電池セル及びそれを含む電池パック
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JP2004303589A (ja) * 2003-03-31 2004-10-28 Sanyo Electric Co Ltd ラミネート電池、その製造方法及びラミネート電池製造用ｌ字金型
JP2007184242A (ja) * 2005-12-29 2007-07-19 Samsung Sdi Co Ltd パウチ型リチウム二次電池及びその製造方法
JP2012022992A (ja) * 2010-07-16 2012-02-02 Sony Corp 電池およびその製造方法
JP2014502025A (ja) * 2010-12-02 2014-01-23 エルジー・ケム・リミテッド 遠心力を用いて二次電池を脱気する方法
JP2015518256A (ja) * 2012-05-07 2015-06-25 エルジー ケム． エルティーディ． 非定型構造の電池セル及びそれを含む電池モジュール
JP2016506606A (ja) * 2013-03-04 2016-03-03 エルジー・ケム・リミテッド 欠落部が形成された電池セル及びそれを含む電池パック
JP2016506610A (ja) * 2013-03-22 2016-03-03 エルジー・ケム・リミテッド エネルギー密度が向上した二次電池
JP2015536036A (ja) * 2013-09-26 2015-12-17 エルジー・ケム・リミテッド 電極組立体及び二次電池の製造方法
JP2016009677A (ja) * 2014-06-26 2016-01-18 株式会社カネカ リチウムイオン二次電池及びその製造方法

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