JP2013025999A - Nonaqueous secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a nonaqueous secondary battery which is arranged so as to suppress the occurrence of the variation in the distance between electrodes owing to the deviation in a direction in a lamination plane of an electrode laminate and to the expansion in a laminating direction, and which has good cycle characteristics.SOLUTION: The nonaqueous secondary battery 10 comprises: an electrode laminate 11 formed by more than one sheet-like positive electrodes and more than one sheet-like negative electrodes 112, which are layered alternately with more than one separators interposed therebetween; and first and second adhesive tapes 17 and 18 which are stuck to the electrode laminate along a loop-like path including an upper base 112a and a lower base 112b perpendicular to a laminating direction of the electrode laminate. The first adhesive tape 17 and the second adhesive tape 18 are located on two opposing sides with respect to a center portion of the electrode laminate 11 in a plane direction of the upper base 112a and the lower base 112b.

Description

  The present invention relates to a stacked non-aqueous secondary battery.

  Non-aqueous secondary batteries are desired to have high output and long-term reliability in applications such as industrial equipment or in-vehicle use. A stacked non-aqueous secondary battery in which a sheet-like positive electrode and a negative electrode are stacked is easy to collect current when it is increased in size, and is often used in batteries for the above applications.

  In a stacked non-aqueous secondary battery, irreversible deformation occurs due to a change in the volume of the electrode accompanying charge / discharge, a decomposition gas of the electrolyte, or the like. The occurrence of non-uniform deformation in the laminated surface causes variations in the distance between the electrodes and causes a rapid capacity reduction.

  Patent Document 1 discloses a sheet-like lithium secondary battery in which a tape is wound around the outer periphery of a laminated structure and fixed, and the tape does not contact the side surface of the laminated structure, and there is a gap between the side surface and the tape. A formed sheet-like lithium secondary battery is disclosed.

  In Patent Document 2, auxiliary sheets are arranged on both end surfaces in the stacking direction of the electrode laminate, and at least two slip prevention tapes are pasted on these auxiliary sheets so as to straddle the electrode laminate. An attached stacked lithium ion battery is disclosed.

JP 2002-198098 A JP 2008-91099 A

  In the sheet-like lithium secondary battery disclosed in Patent Document 1, a bent plate is provided on the side surface of the laminated structure so that the side surface does not contact the tape. Accordingly, the volume of the active material is reduced, and the volume capacity density of the entire battery is lowered. Also, with this configuration, the deviation in the in-plane direction cannot be sufficiently suppressed.

  Moreover, in the laminated lithium ion battery disclosed in Patent Document 2, the deviation in the in-plane direction of the laminated surface is suppressed by the deviation preventing tape. However, the occurrence of variations in the distance between the positive and negative electrodes due to the swelling in the stacking direction cannot be suppressed.

  The object of the present invention is to suppress the variation in the distance between the electrodes due to the displacement in the in-plane direction of the electrode laminate and the swelling in the lamination direction, and is excellent in capacity maintenance characteristics (cycle characteristics) associated with repeated charge and discharge. Another object is to obtain a configuration of a non-aqueous secondary battery.

  The configuration of the nonaqueous secondary battery disclosed in the present invention includes: an electrode laminate in which a plurality of sheet-like positive electrodes and a plurality of sheet-like negative electrodes are alternately laminated via a plurality of separators; And a first adhesive tape and a second adhesive tape attached along a loop-shaped path including an upper bottom surface and a lower bottom surface perpendicular to the stacking direction. Said 1st adhesive tape and said 2nd adhesive tape are arrange | positioned on both sides of the center of the said electrode laminated body in the said upper bottom face and the said lower bottom face inner surface direction.

  In addition, another configuration of the non-aqueous secondary battery disclosed in the present invention includes: an electrode laminate in which a plurality of sheet-like positive electrodes and a plurality of sheet-like negative electrodes are alternately laminated via a plurality of separators; And a first adhesive tape and a second adhesive tape attached along a loop path including an upper bottom surface and a lower bottom surface perpendicular to the stacking direction of the electrode laminate. The first adhesive tape and the second adhesive tape intersect each other.

  According to said structure, a deformation | transformation of the said electrode laminated body is restrict | limited by said 1st and 2nd adhesive tape. Specifically, first, the first and second adhesive tapes suppress the parallel movement in the in-plane direction of the sheet-like electrode constituting the electrode laminate, that is, the deviation in the in-plane direction of the laminate. Furthermore, when the first and second adhesive tapes are affixed along the loop-shaped path, movement in the laminating direction of the sheet-like electrodes constituting the electrode laminate in the affixed portion, that is, the Swelling of the electrode stack can also be suppressed.

  Further, the first adhesive tape and the second adhesive tape are disposed around the center of the electrode laminate in the inward direction of the upper bottom surface and the lower bottom surface, so that an axis passing through the center is arranged. Movement and deformation can be suppressed. That is, it is possible to suppress deviation due to rotation in the lamination plane and deviation due to warpage in the lamination direction.

  Further, by causing the first pressure-sensitive adhesive tape and the second pressure-sensitive adhesive tape to cross each other, parallel movement in the in-plane direction of the sheet-like electrode constituting the electrode laminate is restricted from two directions. Furthermore, deformation with the two directions as axes can be suppressed at the same time, and swelling and warping can be more firmly suppressed.

  According to the present invention, the configuration of a non-aqueous secondary battery excellent in cycle characteristics can be obtained by suppressing the occurrence of variations in the distance between the electrodes due to the displacement in the in-plane direction of the electrode laminate and the swelling in the lamination direction. It is done.

FIG. 1 is a diagram schematically showing a schematic configuration of the nonaqueous secondary battery according to the first embodiment of the present invention. 2 is a cross-sectional view taken along line II-II in FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is an extracted view of the electrode laminate of the nonaqueous secondary battery according to the first embodiment of the present invention. FIG. 5 is a diagram showing an extracted electrode stack of a non-aqueous secondary battery according to a modification of the first embodiment of the present invention. FIG. 6 is a diagram showing an extracted electrode stack of a nonaqueous secondary battery according to the second embodiment of the present invention. FIG. 7 is an extracted view of the electrode laminate of the nonaqueous secondary battery according to the third embodiment of the present invention. FIG. 8 is a diagram showing an electrode laminate extracted from a conventional non-aqueous secondary battery. FIG. 9 is a diagram showing an electrode laminate extracted from a conventional non-aqueous secondary battery, and schematically showing a state in which the distance between the electrodes is shifted. FIG. 10 is a graph showing changes in battery capacity with respect to charge / discharge cycles.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[First embodiment]
[Overall configuration]
FIG. 1 is a diagram schematically showing a schematic configuration of a nonaqueous secondary battery 10 according to the first embodiment of the present invention. The nonaqueous secondary battery 10 includes an electrode laminate 11, a laminate sheath 12, a positive electrode tab 13, a negative electrode tab 14, a positive electrode lead 15, a negative electrode lead 16, and two adhesive tapes 17 and 18.

  The nonaqueous secondary battery 10 has a substantially rectangular flat shape when viewed from the front, and a positive electrode tab 13 and a negative electrode tab 14 extend from one side thereof. In addition, this structure is an illustration, Comprising: The non-aqueous secondary battery 10 can take arbitrary shapes, and you may extend the positive electrode tab 13 and the negative electrode tab 14 from a different edge | side.

  The electrode laminate 11 is accommodated in a laminate sheath 12 together with an electrolyte solution (not shown). Two adhesive tapes 17 and 18 are affixed around the electrode laminate 11. Details of the adhesive tapes 17 and 18 will be described later.

  2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. The electrode laminate 11 includes a plurality of sheet-like positive electrodes 111, a plurality of sheet-like negative electrodes 112, and a plurality of separators 113.

  As shown in FIGS. 2 and 3, the electrode laminate 11 is formed by laminating a plurality of sheet-like positive electrodes 111 and a plurality of sheet-like negative electrodes 112 with a separator 113 interposed therebetween. 2 and 3 exemplify a configuration in which two sheet-like positive electrodes 111 and three sheet-like negative electrodes 112 are laminated, the number of laminated sheets is arbitrary. Each of the two sheet-like positive electrodes 111 is coupled to the positive electrode tab 13 drawn out of the laminate sheath 12 via the positive electrode lead 15. Similarly, each of the three sheet-like negative electrodes 112 is connected to the negative electrode tab 14 drawn out of the laminate sheath 12 through the negative electrode lead 16.

  Although the detailed configuration of the sheet-like positive electrode 111 is not shown, the sheet-like positive electrode 111 includes a current collector and a positive electrode mixture layer formed on both surfaces thereof.

  As the current collector of the positive electrode, a foil such as aluminum or titanium, a plain woven wire net, an expanded metal, a lath net, or a punching metal can be used. The positive electrode tab 13 and the positive electrode lead 15 may be the same type.

  The positive electrode mixture layer is prepared by mixing an active material, a conductive additive, and a binder in an organic solvent to prepare a slurry, and applying and drying this to a current collector, followed by pressure molding or the like. Produced. As the positive electrode active material, lithium manganate, lithium nickel composite oxide, lithium cobalt composite oxide, lithium nickel cobalt composite oxide, vanadium oxide, molybdenum oxide, or the like can be used. As the conductive additive for the positive electrode, graphite, carbon black, acetylene black or the like can be used, but it is preferable to use carbon black as a main component. As the positive electrode binder, polyimide, polyamideimide, polyamide binder, polytetrafluoroethylene (PTFE) dispersion, PTFE powder, rubber binder, polyvinylidene fluoride (PVDF), or the like can be used, but PVDF is used. Is preferred.

  Although the detailed structure of the sheet-like negative electrode 112 is not illustrated, the sheet-like negative electrode 112 includes a current collector and a negative electrode mixture layer formed on one surface or both surfaces thereof.

  As the current collector for the negative electrode, foils of copper, nickel, stainless steel, etc., plain woven wire mesh, expanded metal, lath mesh, punching metal, or the like can be used. The same kind of negative electrode tab 14 and negative electrode lead 16 can be used.

  The negative electrode mixture layer is prepared by mixing an active material and a binder in pure water to prepare a slurry, applying and drying the slurry on a current collector, and then performing pressure molding or the like. As the negative electrode active material, natural graphite, mesophase carbon, amorphous carbon, or the like can be used. As the negative electrode binder, cellulose binders such as carboxymethyl cellulose (CMC) and hydroxypropyl cellulose (HPC), and rubber binders such as styrene butadiene rubber (SBR) and acrylic can be used alone or in combination.

  In addition, an ethylene vinyl acetate copolymer, a polyolefin copolymer, a polyamide copolymer, or the like is applied to the end face of the sheet-like negative electrode 112 in order to insulate it from the laminate sheath 12.

  As the separator 113, a microporous film or a nonwoven fabric such as polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or polyphenyl sulfide (PPS) can be used. .

As the electrolytic solution, a solution in which a lithium salt is dissolved in an organic solvent is used. Organic solvents include vinylene carbonate (VC), propylene carbonate (PC), ethylene carbonate (EC), butylene carbonate (BC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (MEC), and γ From butyrolactone or the like, one kind or a mixture of two or more kinds can be used. As the lithium salt, LiPF ₆ , LiBF ₄ , LiN (CF ₃ SO ₂ ) _2, or the like can be used.

  As the laminate exterior 12, an aluminum laminate sheet or the like can be used. The laminate exterior 12 is sealed using a heat sealing resin or the like.

  As is clear from the above, in the present embodiment, the case where the nonaqueous secondary battery 10 is a laminate type lithium ion secondary battery is illustrated. The present invention is particularly useful when the non-aqueous secondary battery 10 is this type of battery. However, this does not limit the application of the present invention, and can be applied to various nonaqueous secondary batteries within the scope of the invention.

[Configuration of adhesive tape]
Next, with reference to FIG. 4, the structure regarding the adhesive tapes 17 and 18 is demonstrated. FIG. 4 is an extracted view of the electrode laminate 11 of the nonaqueous secondary battery 10 according to the first embodiment of the present invention.

  As described above, the electrode laminate 11 is formed by laminating a plurality of sheet-like positive electrodes 111 and a plurality of sheet-like negative electrodes 112 with a separator 113 interposed therebetween. In this embodiment, the sheet-like positive electrode 111, the plurality of sheet-like negative electrodes 112, and the separator 113 all have a vertically long rectangular shape when viewed from the front. The electrode laminate 11 in which these layers are laminated forms a rectangular parallelepiped having two sheet-like negative electrodes on the outermost side in the laminating direction as upper and lower bottom surfaces, respectively. Hereinafter, these surfaces are referred to as an upper bottom surface 112a and a lower bottom surface 112b.

  Two adhesive tapes 17 and 18 are attached to the entire circumference along a loop-shaped path including the upper bottom surface 112a and the lower bottom surface 112b.

  The adhesive tapes 17 and 18 respectively cover the periphery of the upper end and the lower end of the electrode laminate 11 when viewed from the front. More specifically, the adhesive tape 17 covers the upper end side of the upper bottom surface 112a of the electrode laminate 11 when viewed from the front. Then, the upper bottom side of the lower bottom surface 112b is covered across the stacking direction. The pressure-sensitive adhesive tape 18 covers a side facing the side formed by the pressure-sensitive adhesive tape 17 in the rectangular parallelepiped formed by the electrode laminate 11. That is, the adhesive tape 18 covers the lower end of the upper bottom surface 112a as viewed from the front. Then, the lower bottom surface 112b of the lower bottom surface 112b is covered with the lower end side across the stacking direction.

  Furthermore, the adhesive tape 17 protrudes to the upper part of the upper bottom surface 112a and the lower bottom surface 112b in front view and covers the side surface of the electrode laminate 11 in front view. Similarly, the adhesive tape 18 protrudes to the lower part of the upper bottom surface 112a and the lower bottom surface 112b in the front view and covers the side surface of the electrode laminate 11 in the lower part of the front view.

  In addition, as the adhesive tapes 17 and 18, what is excellent in electrical insulation and heat resistance, and has tolerance with respect to electrolyte solution is used. For example, polypropylene (PP) tape, polyimide tape, or fluorine tape.

  According to the configuration of the nonaqueous secondary battery 10 according to the present embodiment, the deformation of the electrode laminate 11 is limited by the adhesive tapes 17 and 18. Specifically, first, the adhesive tapes 17 and 18 suppress the parallel movement in the in-plane direction of the sheet-like electrode constituting the electrode laminate 11, that is, the deviation in the in-plane direction of the laminate. Furthermore, the adhesive tapes 17 and 18 are attached to the entire circumference along a loop-shaped path including the upper bottom surface 112a and the lower bottom surface 112b, so that the sheet-like shape that constitutes the electrode laminate 11 in the attached portion. Movement of the electrodes in the stacking direction, that is, swelling of the electrode stack 11 can also be suppressed.

  Moreover, since the adhesive tapes 17 and 18 respectively cover the periphery of the upper end and the lower end of the electrode laminate 11 when viewed from the front, deviation due to rotation within the lamination plane and deviation due to warpage in the lamination direction can be suppressed.

  Furthermore, since the adhesive tapes 17 and 18 respectively cover the upper side surface and the lower side surface of the electrode laminate 11 when viewed from the front, the vertical displacement can be suppressed.

[Modification of First Embodiment]
FIG. 5 is an extracted view of the electrode laminate 11 of the nonaqueous secondary battery 10a according to the modification of the first embodiment of the present invention.

  Similarly to the nonaqueous secondary battery 10 according to the first embodiment, the nonaqueous secondary battery 10a includes two adhesive tapes 17a and 18a in a loop-shaped path including an upper bottom surface 112a and a lower bottom surface 112b. Along the entire circumference. On the other hand, unlike the non-aqueous secondary battery 10, the adhesive tapes 17 a and 18 a are not about the upper end and the lower end of the electrode laminate 11, but about a quarter from the upper end and about a quarter from the lower end, respectively. Is arranged. The adhesive tapes 17 a and 18 a are attached in parallel to each other through the left and right side surfaces of the electrode laminate 11 when viewed from the front.

  Also by the structure of the nonaqueous secondary battery 10a concerning this modification, both the shift | offset | difference to the lamination surface direction and the swelling to a lamination direction can be suppressed.

  In this modification, the adhesive tapes 17a and 18a are arranged at a point about 1/4 from the upper end and about 1/4 from the lower end of the electrode laminate 11, respectively. However, as long as the adhesive tapes 17a and 18a are disposed across the center of the electrode laminate 11 in the in-plane direction of the upper bottom surface 112a and the lower bottom surface 112b, the placement locations are arbitrary. Moreover, you may arrange | position through the up-and-down side surface instead of the side surface of the electrode laminated body 11 in front view, and it does not need to be mutually parallel. If the adhesive tapes 17a and 18a are arranged across the center, movement and deformation around an axis passing through the center can be suppressed. That is, it is possible to suppress displacement due to rotation in the lamination plane and deviation due to warpage in the lamination direction.

[Second Embodiment]
FIG. 6 is a view showing the electrode laminate 11 extracted from the nonaqueous secondary battery 20 according to the second embodiment of the present invention.

  The nonaqueous secondary battery 20 further includes an adhesive tape 19 different from the adhesive tapes 17 and 18 in addition to the configuration provided in the nonaqueous secondary battery 10. The adhesive tape 19 is also attached to the electrode laminate 11 along a loop path including the upper bottom surface 112a and the lower bottom surface 112b. The pressure-sensitive adhesive tape 19 is attached to the pressure-sensitive adhesive tapes 17 and 18 so as to pass through substantially the center of the upper bottom surface 112a and the lower bottom surface 112b when viewed from the front.

  According to the configuration of the nonaqueous secondary battery 20 according to the present embodiment, swelling in the stacking direction can be more securely suppressed.

  Note that the non-aqueous secondary battery 20 may include more adhesive tapes. If the sticking area of the adhesive tape is increased, the deformation of the electrode laminate 11 is further suppressed. On the other hand, since the penetration of the electrolyte solution into the electrode laminate 11 is hindered when the adhesive tape sticking area increases, the ratio of the sticking tape sticking area is 50% or less with respect to the surface area of the electrode laminate 11. Preferably, it is 30% or less.

[Third embodiment]
FIG. 7 is an extracted view of the electrode laminate 11 of the nonaqueous secondary battery 30 according to the third embodiment of the present invention.

  As with the non-aqueous secondary battery 10, the non-aqueous secondary battery 30 has two adhesive tapes 17b and 18b attached to the entire circumference along a loop-shaped path including the upper bottom surface 112a and the lower bottom surface 112b. Has been. The adhesive tape 17b is affixed so as to pass through approximately the center of the upper bottom surface 112a and the lower bottom surface 112b when viewed from the front. The adhesive tape 18b is affixed so as to pass through substantially the center of the upper bottom surface 112a and the lower bottom surface 112b when viewed from the front. The adhesive tape 17b and the adhesive tape 18b are orthogonal to each other.

  According to the configuration of the non-aqueous secondary battery 30 according to the present embodiment, the parallel movement in the in-plane direction of the sheet-like electrode constituting the electrode laminate 11 is restricted from two directions. Furthermore, deformation with the two directions as axes can be suppressed at the same time, and swelling and warping can be more firmly suppressed.

  Here, for comparison with the non-aqueous secondary batteries 10 to 30 according to the present invention, the non-aqueous secondary battery 40 according to the conventional configuration will be described. FIG. 8 is a diagram showing the electrode stack 11 extracted from the conventional non-aqueous secondary battery 40.

  In the nonaqueous secondary battery 40, adhesive tapes 17 ′ to 19 ′ are attached to the electrode laminate 11. The adhesive tapes 17 'to 19' are affixed at positions similar to the adhesive tapes 17 to 19 of the nonaqueous secondary battery 20 (see FIG. 6) according to the second embodiment of the present invention. It is not affixed to the entire circumference of the loop-shaped path including 112a and the lower bottom surface 112b. Further, the upper side surface and the lower side surface of the electrode laminate 11 are not covered.

  Specifically, the adhesive tape 17 ′ is affixed around the upper end of the electrode stack 11 when viewed from the front, but is adhered only to the vicinity of the left and right side surfaces when viewed from the front, and does not cover the entire circumference. Similarly, the adhesive tape 18 'is affixed to the periphery of the lower end of the electrode stack 11 when viewed from the front, but is applied only to the vicinity of the left and right side surfaces when viewed from the front and does not cover the entire circumference. Further, the adhesive tape 19 ′ is pasted so as to pass through substantially the center of the upper bottom surface 112a and the lower bottom surface 112b when viewed from the front, but is adhered only to the vicinity of the upper and lower side surfaces of the electrode laminate 11 in the front view. Is not covered.

  FIG. 9 is a diagram showing the electrode stack 11 extracted from the conventional non-aqueous secondary battery 40, and schematically showing a state in which the distance between the electrodes is shifted. In the nonaqueous secondary battery 40, the adhesive tapes 17 'to 19' are not attached to the entire circumference of the loop-shaped path including the upper bottom surface 112a and the lower bottom surface 112b. Therefore, as shown in FIG. 8, even if the deviation in the lamination plane can be suppressed, the swelling in the lamination direction cannot be sufficiently suppressed.

  Hereinafter, based on an Example, this invention is demonstrated more concretely. In addition, this Example does not limit this invention.

94 parts by weight of LiMn ₂ O ₄ as the active material of the positive electrode, 3 parts by weight of carbon black as the conductive auxiliary agent, and 3 parts by weight of PVDF as the binder were mixed uniformly using N-methyl-2-pyrrolidone as a solvent. Then, a slurry of the positive electrode mixture layer was produced.

  And this slurry was apply | coated to both surfaces of the collector which consists of aluminum foil with a thickness of 15 micrometers, and after drying at 110 +/- 10 degreeC, it pressure-molded so that the positive mix layer might become a predetermined density. Thereafter, the positive electrode mixture layer was cut so as to have a width of 109 mm and a length of 197 mm to obtain a sheet-like positive electrode.

  A mixture of 97.8 parts by weight of graphite powder as an active material for the negative electrode and a mixture of 1.2 parts by weight of CMC and 1 part by weight of SBR as a binder to be uniform in pure water. A layer slurry was prepared.

  And this slurry was apply | coated on both surfaces of the collector which consists of a 10-micrometer-thick copper foil, and after drying at 110 +/- 10 degreeC, it pressure-molded so that the negative mix layer might become a predetermined density. Thereafter, the negative electrode mixture layer was cut so as to have a width of 117 mm and a length of 205 mm to obtain a sheet-like negative electrode. The melted polyolefin copolymer was applied to this sheet-like negative electrode so that the width from the end face was 1 to 1.5 mm.

  As a separator, a sheet having a two-layer structure composed of a PE microporous film and a PET nonwoven fabric was cut into a width of 117 mm and a length of 210 mm.

  Fifteen sheet-like positive electrodes and 16 sheet-like negative electrodes were alternately stacked with a separator in between, and fixed with PP tape. A positive electrode tab was connected to the sheet-like positive electrode, and a negative electrode tab was connected to the sheet-like negative electrode via a positive electrode lead and a negative electrode lead, respectively. Then, it was accommodated in a laminate exterior made of an aluminum laminate sheet and having an outer width of 150 mm and a length of 250 mm. After injecting 1 ml of the electrolyte, the laminate exterior was sealed with a heat-sealing resin to produce a non-aqueous secondary battery.

[Example 1]
The configuration of the first embodiment (FIG. 4) was adopted as a fixing method using PP tape.

[Example 2]
As a fixing method using the PP tape, the configuration of the second embodiment (FIG. 6) was adopted.

[Comparative example]
A conventional configuration (FIG. 8) was adopted as a fixing method using PP tape.

  For the purpose of confirming deterioration due to charging / discharging, a cycle test in which charging and discharging are repeated was performed on each non-aqueous secondary battery. The charging voltage was 4.35V.

  FIG. 10 is a graph showing changes in battery capacity with respect to charge / discharge cycles. As shown in FIG. 9, in the comparative example, the capacity suddenly decreased from around 300 cycles, and became 60% or less of the initial capacity around 400 cycles. On the other hand, in Example 1, a rapid capacity decrease was not seen up to the vicinity of 800 cycles. In Example 2, no capacity reduction was observed up to 1100 cycles.

Furthermore, after charging / discharging each battery 400 times on the same conditions, it decomposed | disassembled in the charge condition and observed the surface of the negative electrode. In the comparative example, a compound that was partially blackened with the precipitation of metallic luster Li was observed. On the other hand, Example 1 and Example 2 showed the gloss of gold-colored C ₆ Li on the entire surface, and it was confirmed that no non-uniform reaction occurred.

  The present invention is applicable to a stacked non-aqueous secondary battery.

10, 10a, 20, 30, 40 Non-aqueous secondary battery, 11 electrode laminate, 12 laminate exterior, 13 positive electrode tab, 14 negative electrode tab, 15 positive electrode lead, 16 negative electrode lead, 17-19 adhesive tape 111 sheet-like positive electrode, 112 sheet negative electrode, 113 separator

Claims (5)

An electrode laminate in which a plurality of sheet-like positive electrodes and a plurality of sheet-like negative electrodes are alternately laminated via a plurality of separators;
Attached along a loop-shaped path including an upper bottom surface and a lower bottom surface perpendicular to the stacking direction of the electrode laminate, and first and second adhesive tapes,
The non-aqueous secondary battery in which the first adhesive tape and the second adhesive tape are arranged across the center of the electrode laminate in the inward direction of the upper bottom surface and the lower bottom surface. The non-aqueous secondary battery according to claim 1,
The first pressure-sensitive adhesive tape is in contact with one side forming the upper bottom surface of the electrode laminate and one side of the lower bottom surface facing the side.
The second adhesive tape is a non-aqueous secondary battery in contact with a side opposite to a side in contact with the first adhesive tape. The non-aqueous secondary battery according to claim 1 or 2,
A third adhesive tape attached along a loop-shaped path including the upper bottom surface and the lower bottom surface, further comprising:
The third adhesive tape is a non-aqueous secondary battery that intersects with the first and second adhesive tapes. An electrode laminate in which a plurality of sheet-like positive electrodes and a plurality of sheet-like negative electrodes are alternately laminated via a plurality of separators;
Attached along a loop-shaped path including an upper bottom surface and a lower bottom surface perpendicular to the stacking direction of the electrode laminate, and first and second adhesive tapes,
The non-aqueous secondary battery in which the first adhesive tape and the second adhesive tape intersect. The non-aqueous secondary battery according to any one of claims 1 to 4,
The non-aqueous secondary battery in which the main material forming the active material of the sheet-like positive electrode is a composite oxide containing Li, and 50% or more of the metal excluding Li of the composite oxide is Ni.

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