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Laminated battery

A stacked structure and battery technology, applied in the direction of batteries, secondary batteries, battery electrodes, etc., can solve the problems of reduced durability, performance degradation, current fluctuations, etc., and achieve the effects of improving durability, preventing performance degradation, and reducing differences

Inactive Publication Date: 2016-08-17
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, it was found that the electric current between the electrodes of stacked three or more unit cell layers may fluctuate, which may cause early performance degradation and reduce durability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0195] 1. Fabrication of positive electrode A

[0196] Mix Li(Ni 0.8 co 0.1 al 0.1 )O 2 (average particle diameter: 10 μm), acetylene black as a conductive additive, and polyvinylidene fluoride (PVDF) as a binder to obtain a positive electrode slurry.

[0197] Coating was performed while adjusting the viscosity of the slurry using NMP (N-methyl-2-pyrrolidone), so that the amount of active material per unit area coated on both surfaces of the Al foil as the positive electrode current collector Become a surface 16mg / cm 2 . After sufficient drying, the thickness of the positive electrode (the total thickness of the positive electrode current collector+the positive electrode active material layer (both surfaces)) was adjusted using a roll pressing machine. Here, the thickness of the positive electrode A was 120 μm.

[0198] 2. Fabrication of Negative Electrode A to Negative Electrode C

[0199] Mix negative electrode active material and polyvinylidene fluoride (PVDF) as bi...

Embodiment 2

[0223] 1. Preparation of positive electrode B to positive electrode D

[0224] Li (Ni x co y Al z )O 2 (average particle diameter: 10 μm), acetylene black as a conductive additive, and polyvinylidene fluoride (PVDF) as a binder to obtain a positive electrode slurry.

[0225] Coating was performed while adjusting the viscosity of the slurry using NMP (N-methyl-2-pyrrolidone), so that the amount of active material per unit area coated on both surfaces of the Al foil as the positive electrode current collector Become a surface 15.5mg / cm 2 . After sufficient drying, the thickness of the positive electrode (the total thickness of the positive electrode current collector+the positive electrode active material layer (both surfaces)) was adjusted using a roll pressing machine. Here, the thicknesses of the positive electrodes B to D are all 117 μm.

[0226] [table 3]

[0227] The positive electrode active material Li(Ni x co y Al z )O 2 composition ratio

[0228]

[022...

Embodiment 3

[0244] 1. Fabrication of positive electrode E

[0245] Li (Ni 0.8 co 0.1 Al 0.1 )O 2 (average particle diameter: 10 μm), acetylene black as a conductive additive, and polyvinylidene fluoride (PVDF) as a binder to obtain a positive electrode slurry.

[0246] Coating was performed while adjusting the viscosity of the slurry using NMP (N-methyl-2-pyrrolidone), so that the amount of active material per unit area coated on both surfaces of the Al foil as the positive electrode current collector Become a surface 16mg / cm 2 . After sufficient drying, the thickness of the positive electrode (the total thickness of the positive electrode current collector+the positive electrode active material layer (both surfaces)) was adjusted using a roll pressing machine. Here, the thicknesses of the positive electrodes E were all 120 μm.

[0247] 2. Production of Negative Electrode E ~ Negative Electrode G

[0248] Negative electrode slurry was obtained by mixing natural graphite (average p...

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Abstract

An object of the present invention is to provide a stacked battery capable of suppressing output unevenness of cell layers on the inside and outside of the stacking direction in the stacked battery and improving durability. A laminated structure battery having a laminated structure in which three or more single cell layers are stacked, the single cell layer has at least a positive electrode, a negative electrode, and an electrolyte layer, and the positive electrode and the negative electrode are opposed to each other through the electrolyte layer, This laminated structure battery is characterized in that at least one of the ratio of the positive electrode charge capacity to the negative electrode charge capacity (charge A / C ratio) and the ratio of the positive electrode discharge capacity to the negative electrode discharge capacity (discharge A / C ratio) of each cell layer is One satisfies the central part in the stacking direction> the end parts in the stacking direction.

Description

technical field [0001] The present invention relates to a laminated structure battery as one type of electrical equipment that operates externally by electrochemically interacting with electrons and ions. Specifically, it relates to a stacked structure battery typified by a stacked type (stacked structure) lithium ion secondary battery or the like. Background technique [0002] In recent years, there has been an urgent need to reduce the amount of carbon dioxide in response to air pollution and global warming. In the automotive industry, there is great anticipation for the reduction of carbon dioxide emissions brought about by the introduction of electric vehicles (EV) and hybrid electric vehicles (HEV). To grasp the key to the practical use of these electric vehicles and hybrid electric vehicles The development of secondary batteries is actively advancing. [0003] Secondary batteries for driving motors are required to have extremely high output characteristics and high e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/04H01M4/02H01M4/13H01M4/58H01M10/052H01M10/0585
CPCH01M6/46H01M10/0585H01M2010/4292H01M2220/20H01M10/0413H01M10/0525Y02E60/10Y02P70/50H01M4/58H01M4/5805H01M4/5825
Inventor 平井珠生小原健儿
Owner NISSAN MOTOR CO LTD
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