CN115663109A - Battery cathode and electrochemical device comprising same - Google Patents
Battery cathode and electrochemical device comprising same Download PDFInfo
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- CN115663109A CN115663109A CN202211429212.2A CN202211429212A CN115663109A CN 115663109 A CN115663109 A CN 115663109A CN 202211429212 A CN202211429212 A CN 202211429212A CN 115663109 A CN115663109 A CN 115663109A
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- negative electrode
- active coating
- anode
- battery
- current collector
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Images
Classifications
-
- 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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to a battery negative electrode, which comprises a negative electrode current collector and negative electrode active coatings coated on two sides of the negative electrode current collector, and is characterized in that the negative electrode active coatings comprise a first negative electrode active coating arranged on the negative electrode current collector in a main body area and a second negative electrode active coating arranged on the edge of the main body area, wherein the first negative electrode active coating has a lithium intercalation potential different from that of the second negative electrode active coating. The invention also relates to an electrochemical device comprising a battery anode according to the invention.
Description
Technical Field
The present application relates to the field of batteries, and in particular, to a battery anode and an electrochemical device including the same.
Background
In recent years, with rapid progress of industrial technologies, various portable electronic devices such as mobile phones, notebooks, wearable devices, and the like have emerged; meanwhile, due to the increasing concern of human beings on the storage environment, electric vehicles and various energy storage power stations also enter a rapid development period. These rapidly growing industries all require high performance rechargeable batteries as energy storage devices.
In the existing various energy storage technologies, lithium ion batteries are widely popularized and used due to the advantages of excellent energy density, long cycle service life, low self-discharge, no memory effect and the like.
In the prior art, a lithium ion battery generally comprises a positive electrode and a negative electrode coated with positive and negative electrode active materials, an electronically insulated porous diaphragm arranged between the positive electrode and the negative electrode, and an organic electrolyte filled in pores of the positive electrode, the negative electrode and the diaphragm. In the manufacturing process of the lithium ion battery, an anode, a diaphragm and a cathode sequentially form an electrode assembly in a winding or laminating mode, then the electrode assembly is placed in a battery cell shell, an organic electrolyte is injected into the battery cell shell, then the battery cell is sealed, and the lithium ion battery is formed after charging.
For such a lithium ion battery, the positive and negative electrode active materials are each composed of a material having lithium ion intercalation and deintercalation ability. Common positive active materials include Lithium Cobaltate (LCO), lithium Manganate (LMO), lithium iron phosphate (LFP), and ternary materials (NCM); common negative active materials include graphite, silicon-based materials such as SiOx, silicon carbon composites, and Lithium Titanate (LTO).
Because the graphite negative electrode and the silicon-based material negative electrode have extremely low lithium intercalation potential and higher theoretical specific capacity (graphite 375mAh/g and silicon 4200 mAh/g), the lithium ion battery with the graphite negative electrode or the silicon-based material negative electrode has higher voltage, capacitance and energy density, thereby being commercially used in a large range.
However, when graphite or a silicon-based material is used as the negative electrode, lithium is easily separated and metallic lithium dendrites are generated due to a very low intercalation potential of lithium ions in the negative electrode (3.05V compared to a standard hydrogen electrode) and a very high activity of metallic lithium, and the metallic lithium dendrites penetrate through the separator to form a short circuit between the positive electrode and the negative electrode, thereby causing a great safety hazard.
In order to avoid the above-mentioned risk of lithium deposition, various measures are required in the prior art, such as configuring the negative electrode to have a width and a length in the width and length directions larger than those of the positive electrode, the alignment between the positive electrode and the negative electrode must be precisely secured, the capacity per unit area of the negative electrode must be larger than that of the positive electrode, the positive electrode active coating region must never face the negative electrode photo-foil region, and the like.
Meanwhile, the lithium ion battery in the prior art is generally formed by coating slurry on two sides of a current collector foil by using a precision extrusion coater, drying and rolling. Therefore, the areal density of the coating in the edge region is not easily controlled, and depending on the slurry properties, there may be cases where the areal density of the coating in the edge region is higher or lower than in the middle portion. In order to avoid the risk of lithium precipitation, the electrode plate needs to be used after the edge of the electrode plate is cut off, so that huge waste is generated.
In view of the above problems in the prior art, there is a need in the art to develop a new negative electrode or lithium ion battery to solve the above problems.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a battery anode including an anode current collector and anode active coatings coated on both sides of the anode current collector, characterized in that the anode active coatings include a first anode active coating disposed on a main region of the anode current collector and a second anode active coating disposed on an edge region of the main region, wherein the first anode active coating has a different lithium intercalation potential from the second anode active coating.
By means of the battery cathode provided by the invention, lithium deposition or lithium precipitation at the edge of a pole piece can be avoided while higher energy density is kept, and the safety and reliability of an electrochemical device are further improved.
In the context of the present invention, the negative electrode current collector is in a shape having a length, a width and a thickness, wherein the dimensions of the "length" and the "width" of the negative electrode current collector are significantly larger than the "thickness" and the dimension of the "length" is larger than the dimension of the "width".
In the context of the present invention, the "body region" of the negative electrode current collector refers to a region on the negative electrode current collector within a range defined by the length and width of the negative electrode current collector, where the length of the body region does not exceed the length of the negative electrode current collector, and the width of the body region does not exceed the width of the negative electrode current collector.
In the context of the present invention, an "edge region" of a body region refers to a region near an edge of the body region in the length direction and/or an edge in the width direction.
According to one embodiment of the invention, the "edge regions" of the body region may be distributed at each edge of the body region, for example, when the body region is rectangular, the edge regions are distributed at four edges of the body region. According to another embodiment of the invention, the dimension of the edge region in the length direction of the body region is more than 0% to 10%, such as 1% to 10% or 1% to 5% of the length of the body region. According to a further embodiment of the invention, the dimension of the edge region in the width direction of the body region is more than 0% to 10%, such as 1% to 10% or 1% to 5% of the width of the body region.
According to one embodiment of the present invention, the body region has substantially the same length and width as the negative electrode current collector.
According to one embodiment of the invention, a first negative active coating is provided in a body region and a second negative active coating is provided at an edge of the body region, wherein the second negative active coating at least partially surrounds the first negative active coating in a plane constituted by a length and a width of a negative current collector.
According to an embodiment of the present invention, the second negative electrode active coating layer surrounds the first negative electrode active coating layer only in a length direction in a plane constituted by a length and a width of the negative electrode current collector.
According to an embodiment of the present invention, the second negative electrode active coating layer surrounds the first negative electrode active coating layer only in a width direction in a plane constituted by a length and a width of the negative electrode current collector.
According to an embodiment of the present invention, the second negative electrode active coating layer integrally surrounds the first negative electrode active coating layer in a plane constituted by a length and a width of the negative electrode current collector.
According to an embodiment of the present invention, the second anode active coating is directly coated on both sides of the anode current collector in the edge region, and it is also contemplated that the first anode active coating is directly coated on both sides of the anode current collector in the edge region and the second anode active coating is coated on the surface of the first anode active coating at the edge region of the body region.
According to an embodiment of the present invention, the edge region may exceed the length of the negative electrode collector in the length direction in a plane formed by the length and the width of the negative electrode collector, and it is also contemplated that the edge region may exceed the width of the negative electrode collector in the width direction.
According to one embodiment of the invention, the total thickness of the coating in the edge region is greater than the coating thickness in the bulk region, or the total thickness of the coating in the edge region is equal to the coating thickness in the bulk region, or the total thickness of the coating in the edge region is less than the coating thickness in the bulk region.
According to an embodiment of the present invention, the first negative electrode active coating layer has a lower lithium intercalation potential than the second negative electrode active coating layer.
According to one embodiment of the present invention, the first negative active coating layer includes a first active material having a lithium intercalation potential of less than 0.5V (vs. Li/Li +).
According to one embodiment of the present invention, the second anode active coating layer comprises more than 10 wt%, preferably 50-100 wt% of a second active material having a lithium insertion potential higher than 0.5V (vs. Li/Li +).
According to one embodiment of the invention, the first active material may be those having a lithium intercalation potential below 0.5V (vs. Li/Li +), such as graphite (lithium intercalation potential of about 0.1V vs. Li/Li) + ) Silicon-based materials (Li/Li at about 0.2V vs. Li potential) + )。
According to one embodiment of the invention, the first negative material comprises any one or a combination of two or more selected from the group consisting of: natural graphite, artificial graphite, graphene, carbon nanotubes, porous carbon materials, soft carbon and hard carbon; silicon-based materials such as silicon, silicon oxide SiOx; a silicon carbon composite material; tin-based materials such as tin, tin oxide SnOx; a tin-carbon composite material; boron-based materials, and the like.
According to one embodiment of the invention, the second active material may be those having a lithium insertion potential higher than 0.5V (vs. Li/Li +), such as a bismuth-based material (lithium insertion potential of about 0.7V vs. Li/Li) + ) Phosphorus-based materials (intercalation potential of about 0.7V Vs. Li/Li) + )、Li 2 TiSiO 5 (lithium insertion potential is about 0.9V Vs. Li/Li) + )、Li 4 Ti 5 O 12 (lithium intercalation potential about 1.5V Vs. Li/Li) + )、LiTi 2 (PO 4 ) 3 (lithium intercalation potential about 2.5V Vs. Li/Li + ) And the like.
According to an embodiment of the present invention, the second negative material includes any one or a combination of two or more selected from the group consisting of: lithium titanate Li 4 Ti 5 O 12 (LTO), titanium silicate salts such as Li 2 TiSiO 5 Titanium phosphates, e.g. Li 3 Ti 2 (PO 4 ) 3 Niobium-based oxides such as TiNb 2 O 7 ,NiNb 2 O 7 ,WNb 2 O 8 ,V 4 Nb 18 O 55 Layered sulfides, e.g. LiTiS 2 ,LiVS 2 Phosphorus-based materials, bismuth-based materials, and the like.
When the negative electrode adopts an active material with low lithium intercalation potential, the formed lithium ion battery has higher open-circuit voltage and thus higher energy density, however, because the lithium intercalation potential is lower, when lithium ions cannot be timely intercalated at the lower potential, lithium ions are separated out from the surface of the negative electrode and form lithium dendrites, thereby generating potential safety hazards. When the lithium ion battery is used under the condition of low temperature, the lithium ion battery is rapidly charged, the capacity matching of the positive electrode and the negative electrode has defects, particularly when the control of the alignment degree between the positive electrode and the negative electrode at the edge part of the pole piece and the neck part area of the pole lug is not accurate enough or dislocation occurs in the assembling and using processes, the potential safety hazard can obviously reduce the safety and reliability of the lithium ion battery.
When the negative electrode adopts an active material with a higher lithium intercalation potential, lithium ions are intercalated into the negative electrode active material at the higher potential, and the lithium ion battery formed by the active material has higher safety because the precipitation potential of the metal lithium is not reached, so that the safety problem caused by the metal lithium dendrite is not needed to be worried. However, when the potential of the negative electrode is high, the lithium ion battery formed by the method generally has a low open circuit voltage, so that the energy density of the battery is low, and the use of the battery is limited.
In the embodiment according to the present invention, the negative active material having a low lithium intercalation potential is still used for the main region of the negative electrode, but the negative active material having a high lithium intercalation potential is used for the edge region of the main region and the neck region of the tab. In this case, when the positive and negative electrodes are slightly misaligned so that the alignment is not well secured or the acceptance of the negative electrode is exceeded due to the uniformity of the coating surface density at the edge of the positive electrode, in the embodiment according to the present invention, since the edge region of the positive electrode corresponds to the second negative electrode active coating of the negative electrode having a higher lithium intercalation potential, there is no risk of lithium deposition or lithium dendrite.
According to one embodiment of the invention, the main region of the negative electrode is still provided with a first negative active coating with a lower lithium insertion potential, so that a higher energy density can be provided, while the edge region of the main region and the neck region of the battery tab are provided with a second negative active coating with a higher lithium insertion potential. Despite the low contribution capacity, the second active coating still has the function of lithium ion intercalation/deintercalation, and simultaneously can avoid lithium deposition or lithium precipitation at the edge of the pole piece due to the high lithium intercalation potential. Therefore, by means of the battery cathode according to the present invention, the safety reliability of the lithium ion battery can be improved without sacrificing the energy density of the battery.
According to one embodiment of the present invention, the second negative active coating layer covers at least one edge of the negative current collector.
According to one embodiment of the present invention, the second negative active coating layer covers a neck region of a tab of the negative current collector.
The "tab" described in the context of the present invention is present in a manner conventional in the art and has a neck region in a manner known in the art.
The invention also relates to an electrochemical device, comprising a battery positive electrode, a battery negative electrode according to the invention and a separator arranged between the battery positive electrode and the battery negative electrode, wherein the battery positive electrode comprises a positive electrode collector and a positive electrode active coating applied thereto, wherein the width of the positive electrode active coating is not more than 105%, for example in the range of 95% to 105%, in particular in the range of 100% to 105%, of the width of the negative electrode active coating, and/or the length of the positive electrode active coating is not more than 105%, for example in the range of 95% to 105%, in particular in the range of 100% to 105%, of the length of the negative electrode active coating.
According to an embodiment of the present invention, in the electrochemical device according to the present invention, the width of the positive active coating layer may be substantially equal to the width of the negative active coating layer, for example, the width of the positive active coating layer is 95% to 105%, particularly 98% to 102%, preferably 99% to 101% of the width of the negative active coating layer, and it is particularly contemplated that in the electrochemical device according to the present invention, the width of the positive active coating layer is 100% to 105%, particularly 100% to 102%, preferably 100% to 101% of the width of the negative active coating layer.
According to an embodiment of the present invention, in the electrochemical device according to the present invention, the length of the positive active coating layer is equal to the length of the negative active coating layer.
According to an embodiment of the present invention, in the electrochemical device according to the present invention, the width of the positive active coating layer is equal to the width of the negative active coating layer.
According to an embodiment of the present invention, in the electrochemical device according to the present invention, the length of the positive electrode active coating layer is less than the length of the negative electrode active coating layer, and preferably the length of the positive electrode active coating layer is 95% to 100%, and particularly 98% to 100% of the length of the negative electrode active coating layer.
According to an embodiment of the present invention, in the electrochemical device according to the present invention, the width of the positive electrode active coating layer is smaller than the width of the negative electrode active coating layer, and preferably the width of the positive electrode active coating layer is 95% to 100%, and particularly 98% to 100% of the width of the negative electrode active coating layer.
According to an embodiment of the present invention, in the electrochemical device according to the present invention, the edge region of the positive electrode active coating layer is opposed to the edge region of the negative electrode main body region according to the present invention, so that the wind direction of lithium deposition can be avoided even in the case where the positive electrode and the negative electrode are slightly misaligned.
According to one embodiment of the invention, the electrochemical device according to the invention is a battery.
Without being bound by the theory of the prior art, in the battery according to the present invention, the positive electrode does not have to have a smaller dimension in the length direction and the width direction than the negative electrode, and the relative positions of the positive electrode and the negative electrode are not limited by the degree of alignment in the prior art.
According to one embodiment of the invention, the battery according to the invention is formed by winding, alternatively or additionally, the battery according to the invention is formed by lamination.
According to one embodiment of the invention, the battery according to the invention is constructed in the shape of a hard shell square or cylinder.
According to one embodiment of the invention, the battery according to the invention is constructed by means of an aluminum plastic film package.
Brief Description of Drawings
In order that the above objects, features and advantages of the present invention can be more readily understood, a detailed description of preferred embodiments of the present invention will be made with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments disclosed below.
Fig. 1A schematically illustrates a top view of a battery anode according to an embodiment of the present invention;
fig. 1B schematically illustrates a side view of a battery anode according to an embodiment of the present invention;
fig. 2 schematically shows a top view of a battery anode according to another embodiment of the present invention;
figure 3A schematically illustrates a side view of a lamination assembly in accordance with one embodiment of the invention;
figure 3B schematically shows a perspective view of the lamination assembly according to figure 3A;
fig. 4 schematically illustrates a top view of a battery anode according to another embodiment of the present invention;
fig. 5 schematically shows a perspective view of a wound battery according to an embodiment of the present invention.
List of reference numerals
110. Pole ear
120. First negative active coating
130MD direction in the edge region
Second negative active coating layer in edge region in 140TD direction
150 second anode active coating in the neck region of the tab
Dimension of Wm second anode active coating layer in MD direction
Size of Wt second anode active coating in TD direction
Size of second negative active coating in neck region of Wn tab
160. Negative current collector
210. Negative current collector
220. First negative active coating
Second negative active coating in 230MD
Second negative active coating in 240TD direction
310. Diaphragm
320. Negative electrode according to the invention
321. Negative current collector
322. First negative active coating
323. Second negative active coating
330. Positive electrode
331. Positive current collector
332. Positive active coating
410. Negative current collector
420. First negative active coating
430MD second negative active coating in edge region
Second negative active coating layer in edge region in 440TD direction
450. Pole ear
460. Insulating gummed paper
510. Positive electrode
520. Diaphragm
530. Negative electrode
531. First negative active coating
532MD edge region second negative active coating
Second negative active coating in edge region in 533TD direction
Detailed Description
The above and other objects, components and advantages will become apparent from the following more detailed description of particular embodiments, as illustrated and exemplified in the accompanying drawings, in which like reference numbers, designations and the like refer to like components, components or features of particular embodiments.
The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described herein are illustrative and are provided to provide a basic understanding of the present application. The embodiments of the present application should not be construed as limiting the present application. All other embodiments obtained by a person skilled in the art based on the technical solutions provided in the present application and the given embodiments belong to the scope of protection of the present application.
Unless otherwise indicated, terms used in the present application have well-known meanings that are commonly understood by those skilled in the art. Unless otherwise indicated, the numerical values of the parameters mentioned in the present application can be measured by various measurement methods commonly used in the art (for example, the test can be performed according to the methods given in the examples of the present application).
A list of items to which the term "at least one of," "at least one of," or other similar term is connected may imply any combination of the listed items. For example, if items a and B are listed, the phrase "at least one of a or B" means a only; only B; or A and B. In another example, if items A, B and C are listed, the phrase "at least one of A, B or C" means a only a; or only B; only C; a and B (excluding C); a and C (excluding B); b and C (excluding A); or A, B and all of C. Item A may comprise a single component or multiple components. Item B can comprise a single component or multiple components. Item C may comprise a single component or multiple components.
Positive electrode
According to some embodiments of the invention, the positive electrode comprises a positive current collector and a positive pole piece, wherein the positive pole piece is formed by applying a positive slurry onto the positive current collector in a known manner, said positive slurry comprising a positive active material including, but not limited to: lithium cobaltate (LiCoO) 2 ) Lithium Nickel Cobalt Manganese (NCM) ternary material, lithium iron phosphate (LiFePO) 4 ) Or lithium manganate (LiMn) 2 O 4 )。
According to some embodiments of the invention, the positive electrode slurry further comprises a binder, and optionally a conductive material. The binder improves the binding of the positive electrode active material particles to each other, and also improves the binding of the positive electrode slurry to the current collector. In some embodiments, the binder comprises: polyvinyl alcohol, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide containing polymers, polyvinyl pyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene 1,1-difluoroethylene, polyethylene, polypropylene, styrene butadiene rubber, acrylated styrene butadiene rubber, epoxy or nylon, and the like.
According to some embodiments of the invention, the conductive material includes, but is not limited to: carbon-based materials, metal-based materials, conductive polymers, and mixtures thereof. In some embodiments, the carbon-based material is selected from natural graphite, artificial graphite, carbon black, acetylene black, ketjen black, carbon fiber, or any combination thereof. In some embodiments, the metal-based material is selected from metal powder, metal fiber, copper, nickel, aluminum, or silver. In some embodiments, the conductive polymer is a polyphenylene derivative.
According to some embodiments of the invention, the positive electrode current collector includes, but is not limited to: aluminum foil.
Negative electrode
According to some embodiments of the invention, the negative electrode comprises a negative electrode current collector and a negative electrode tab, wherein the negative electrode tab is formed by applying a negative electrode slurry on the negative electrode current collector in a known manner. According to some embodiments of the invention, a battery anode according to the invention is provided with a first anode active coating and a second anode active coating, the first anode active coating having a lower intercalation potential than the second anode active coating.
According to some embodiments of the invention, the negative electrode slurry may further comprise a binder comprising one or more of polyvinylidene fluoride, copolymers of vinylidene fluoride-hexafluoropropylene, polyamides, polyacrylonitriles, polyacrylates, polyacrylic acids, polyacrylates, sodium carboxymethylcellulose, polyvinylpyrrolidone, polyvinyl ethers, polymethyl methacrylates, polytetrafluoroethylene, and polyhexafluoropropylene, styrene butadiene rubber, acrylates, and epoxies.
According to some embodiments of the present invention, the negative electrode may further include a conductive coating between the negative electrode tab and the negative electrode current collector, the conductive coating including one or more of a conductive agent such as carbon fiber, ketjen black, acetylene black, carbon nanotubes, and graphene. In some embodiments, the negative electrode current collector may include at least one of a copper foil, an aluminum foil, a nickel foil, or a carbon-based current collector.
Electrochemical device
According to some embodiments of the invention, the electrochemical device according to the invention includes, but is not limited to: electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, power storage systems, and the like. In order to meet the demand of the electrochemical device for high power and high energy density of the lithium ion battery, a battery pack or a battery module may be used.
According to some embodiments of the invention, the electrochemical device may be a tablet computer, a mobile phone, a notebook computer, or the like. The electrochemical device is generally required to be light and thin, and a lithium ion battery can be used as a power source.
According to some embodiments of the invention, the electrochemical device comprises a battery anode according to the invention.
Example 1
Fig. 1A shows a negative electrode according to the invention for a laminated lithium ion battery, which consists of a negative electrode current collector and a negative electrode active coating applied on both sides of the negative electrode current collector, wherein the negative electrode active coating comprises a first negative electrode active coating 120 arranged on the main area of the negative electrode current collector and second negative electrode active coatings 130, 140 arranged on the edge areas of the main area, wherein in the embodiment shown in the left drawing of fig. 1A the second negative electrode active coatings are arranged in the edge areas in the MD direction and the TD direction, and in the embodiment shown in the right drawing of fig. 1A the second negative electrode active coatings are arranged only in the edge areas in the MD direction.
The MD direction represents a coating direction of a coater for applying the above coating layer, and the TD direction represents a direction perpendicular to the MD direction. In fig. 1A, the MD direction is the longitudinal direction and the TD direction is the width direction.
In addition, a second anode active coating 150 may be applied to a neck region of the tab, which is used to connect the anode and the tab.
Also shown in fig. 1A are the width Wm of the second anode active coating in the MD direction, the width Wt of the second anode active coating in the TD direction, and the width Wn of the second anode active coating in the neck region of the tab. In order to minimize the influence on the energy density of the battery, wm is set at 0.1mm to 10mm, preferably 1mm to 5mm, wt is set at 0.1mm to 10mm, preferably 1mm to 5mm, and Wn is set at 0.1mm to 10mm, preferably 1mm to 5mm.
Fig. 1B schematically shows a side view of a battery anode according to one embodiment of the present invention, and within the scope of the present invention, the second anode active coating may be provided in various ways in the edge region, for example, only the first anode active coating 120 in the central bulk region of the anode current collector 160 and only the second anode active coating 130 in the edge region of the bulk region, in which case the second anode active coating at least partially surrounds the first anode active coating, as shown in mode 1. Alternatively or additionally, it is also possible to arrange the second anode active coating above the first anode active coating in the edge region, in which case the second anode active coating covers the first anode active coating in the edge region, as shown in version 2. It is also conceivable for the second anode active coating to partially cover the first anode active coating in the edge region, as shown in modes 1, 3 and 4. Alternatively or additionally, the end surface of the second negative active coating may be flush with the end surface of the negative current collector in manner 1 or 2, or may also be formed into a smooth transition shape in manner 4. Further, the edge area may be beyond the range of the negative electrode collector on the plane formed by the length and width of the negative electrode collector, as shown in mode 3.
Example 2
Fig. 2 schematically shows a top view of a battery anode according to another embodiment of the present invention, and in particular, fig. 2 shows a state of the battery anode before cutting.
In the production of the negative electrode according to the present invention, a plurality of first negative electrode active coatings 220 are coated on the negative electrode current collector 210 in a coating direction (MD) by means of a known coating method, wherein in the MD direction, the edges of each first negative electrode active coating are provided with the second active coating 230, thereby forming a plurality of first negative electrode active coatings as shown in the lower diagram in fig. 2.
Then, as shown in the upper diagram of fig. 2, on each of the first anode active coating layers 220, a second anode active coating layer 240 of a certain width is coated at certain intervals in a direction (TD) perpendicular to the coating direction by means of gap coating.
Example 3
Fig. 3A schematically shows a side view of a laminated stack assembly according to an embodiment of the present invention, in which a plurality of positive electrodes 330, a separator 310, and a negative electrode 320 according to the present invention are sequentially stacked to form the laminated stack assembly, wherein the positive electrodes are obtained in a manner known in the art and consist of a positive electrode current collector 331 and a positive electrode active coating 332 coated on both sides thereof. Here, the negative electrode 320 according to the present invention is composed of a negative electrode collector 321 and a negative electrode active coating 321 coated on both sides of the negative electrode collector, the negative electrode active coating being composed of a first negative electrode active coating 322 located in a main region of the center of the pole piece and a second active coating 323 located in an edge region of the main region.
As shown in the right drawing in fig. 3A, the two negative electrodes 320 at the outermost side of the lamination assembly according to the present invention may be composed of a negative electrode collector 321 and a negative electrode active coating 321 coated on a single side of the negative electrode collector, whereby both sides of the lamination assembly are configured as negative electrode collectors, so that the energy density may be further improved.
Fig. 3B schematically shows a perspective view of the lamination assembly according to fig. 3A, wherein the positive electrode, the separator and the negative electrode are stacked in sequence to form the lamination assembly. The lithium ion battery with high safety and reliability can be formed by assembling, baking, injecting, sealing, chemical forming and other processes by the technology known in the art.
Example 4
Fig. 4 schematically shows a top view of a negative electrode for a rolled lithium battery according to the present invention, which consists of a negative electrode current collector 410 and a negative electrode active coating coated on both sides thereof. The negative active coating is composed of a first negative active coating 420 located in the main area of the center of the pole piece and a second active coating disposed around the periphery of the first negative active coating, the second negative active coating being disposed in an edge area 430 in the MD direction and an edge area 440 in the TD direction. Wherein the width of the second anode active coating layer 430 arranged in the MD direction is Wm, and the width of the second active coating layer 440 arranged in the TD direction is Wt. A negative electrode tab 450 is welded on the smooth foil area of the negative electrode current collector 410, and insulating gummed paper 460 is pasted on the surface of the welding area.
The width of the second anode active coating layer in the MD direction (coating direction) is defined as Wm, the width of the second active coating layer in the direction perpendicular to the coating direction TD is defined as Wt (i.e., the head-to-tail portion of the second anode active coating layer), and the width of the second active coating layer in the neck region of the tab is defined as Wn. Wherein Wm may be set to 0.1-10mm, preferably 1-5mm; wt may be set to 0.1-10mm, preferably 1-5mm; wn may be set to 0.1-10mm, preferably 1-5mm.
Example 5
Fig. 5 schematically shows a perspective view of a wound battery according to an embodiment of the present invention, in which a jelly roll assembly formed by winding a positive electrode 510, a negative electrode 530 according to the present invention, and a separator 520 is contained in a battery case, the negative active coating layer of the negative electrode 530 according to the present invention is composed of a first negative active coating layer 531 in a main region at the center of the electrode sheet and second active coating layers 532 and 533 disposed around the periphery of the first negative active coating layer, wherein the second active coating layer 532 is disposed in a coating direction MD and the second active coating layer 533 is disposed in a direction TD perpendicular to the coating direction in an edge region of the main region.
By arranging the negative electrode active coating with high lithium intercalation potential at the edge of the negative electrode, the risk of lithium deposition or lithium dendrite caused by poor alignment of the positive electrode and the negative electrode, dislocation of the positive electrode and the negative electrode or uneven density of the edge surface of the positive electrode coating is greatly reduced according to the embodiment of the invention.
While various modifications have been described herein with reference to specific embodiments thereof, it should be understood that this description is by way of illustration only and should not be construed to limit the scope of any claimed invention. Accordingly, the scope and content of any claimed invention should be limited only by the terms of the appended claims, in their current form or form as modified during prosecution, or as otherwise amended during prosecution. Furthermore, it is to be understood that, unless otherwise specified, features of any particular embodiment discussed herein may be combined with one or more features of any one or more embodiments otherwise discussed or contemplated herein. Those skilled in the art will recognize that certain modifications and changes may be made to the described embodiments without departing from the spirit and scope of the present application, as described in the appended claims.
Claims (10)
1. A battery negative electrode comprising a negative electrode current collector and negative electrode active coatings coated on both sides of the negative electrode current collector, wherein the negative electrode active coatings comprise a first negative electrode active coating disposed on a main region of the negative electrode current collector and a second negative electrode active coating disposed on an edge of the main region, wherein the first negative electrode active coating has a different lithium intercalation potential than the second negative electrode active coating.
2. The battery anode of claim 1, wherein the first anode active coating has a lower intercalation potential than the second anode active coating.
3. The battery anode of claim 1 or 2, wherein the first anode active coating comprises a first active material having less than 0.5V (vs + ) The intercalation potential of (a).
4. The battery anode of claim 1 or 2, characterized in that the second anode active coating comprises more than 10 wt. -%, preferably 50-100 wt. -% of a second active material having higher than 0.5V (vs + ) The intercalation potential of (a).
5. The battery anode of claim 3, wherein the first active material comprises any one or a combination of two or more selected from the group consisting of: natural graphite, artificial graphite, graphene, carbon nanotubes, porous carbon materials, soft carbon and hard carbon; silicon-based materials such as silicon, silicon oxide SiOx; a silicon carbon composite material; tin-based materials such as tin, tin oxide SnOx; a tin-carbon composite material; a boron-based material.
6. The battery anode of claim 4, wherein the second active material comprises any one or a combination of two or more selected from the group consisting of: lithium titanate, titanium silicate, titanium phosphate, niobium-based oxide, layered sulfide, phosphorus-based material and bismuth-based material.
7. The battery anode of claim 1 or 2, wherein the second anode active coating covers at least one edge of the anode current collector.
8. The battery anode of claim 1 or 2, wherein the second anode active coating covers a neck region of a tab of the anode current collector.
9. An electrochemical device comprising a battery positive electrode, a battery negative electrode according to any one of claims 1 to 8, and a separator disposed between the battery positive electrode and the battery negative electrode,
wherein the battery anode comprises an anode current collector and an anode active coating coated on the anode current collector,
wherein the width of the positive active coating is not more than 105% of the width of the negative active coating, such as in the range of 95% to 105%, in particular in the range of 100% to 105%, and/or the length of the positive active coating is not more than 105% of the length of the negative active coating, such as in the range of 95% to 105%, in particular in the range of 100% to 105%.
10. The electrochemical device according to claim 9, wherein a length and a width of the positive electrode active coating layer are equal to or less than a length and a width of the negative electrode active coating layer, respectively.
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| CN202211429212.2A CN115663109A (en) | 2022-11-15 | 2022-11-15 | Battery cathode and electrochemical device comprising same |
| PCT/CN2023/131285 WO2024104291A1 (en) | 2022-11-15 | 2023-11-13 | Battery anode and electrochemical apparatus comprising battery anode |
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| CN202211429212.2A CN115663109A (en) | 2022-11-15 | 2022-11-15 | Battery cathode and electrochemical device comprising same |
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| WO (1) | WO2024104291A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117038860A (en) * | 2023-10-10 | 2023-11-10 | 宁德时代新能源科技股份有限公司 | Cathode plate, electrode assembly, battery and electric equipment |
| WO2024104291A1 (en) * | 2022-11-15 | 2024-05-23 | 蔚来电池科技(安徽)有限公司 | Battery anode and electrochemical apparatus comprising battery anode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112952051A (en) * | 2019-12-11 | 2021-06-11 | 广州汽车集团股份有限公司 | Negative pole piece, preparation method of negative pole piece, lithium ion hard-package battery cell, lithium ion battery package and application of lithium ion hard-package battery cell |
| KR20210105254A (en) * | 2020-02-18 | 2021-08-26 | 삼성에스디아이 주식회사 | Anode and All Solid secondary battery comprising anode |
| CN113707842A (en) * | 2021-08-30 | 2021-11-26 | 维沃移动通信有限公司 | Electrode pole piece, manufacturing method thereof and battery cell |
| CN114242930A (en) * | 2022-01-07 | 2022-03-25 | 珠海冠宇电池股份有限公司 | Pole piece and battery |
| CN114628630A (en) * | 2022-03-21 | 2022-06-14 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN115663109A (en) * | 2022-11-15 | 2023-01-31 | 蔚来电池科技(安徽)有限公司 | Battery cathode and electrochemical device comprising same |
-
2022
- 2022-11-15 CN CN202211429212.2A patent/CN115663109A/en active Pending
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024104291A1 (en) * | 2022-11-15 | 2024-05-23 | 蔚来电池科技(安徽)有限公司 | Battery anode and electrochemical apparatus comprising battery anode |
| CN117038860A (en) * | 2023-10-10 | 2023-11-10 | 宁德时代新能源科技股份有限公司 | Cathode plate, electrode assembly, battery and electric equipment |
| CN117038860B (en) * | 2023-10-10 | 2024-04-05 | 宁德时代新能源科技股份有限公司 | Cathode plate, electrode assembly, battery and electric equipment |
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