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Method for manufacturing nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, which is applied in the direction of non-aqueous electrolyte storage battery, secondary battery manufacturing, non-aqueous electrolyte, etc., and can solve problems such as cracks in the positive electrode composite material layer

Pending Publication Date: 2021-09-14
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, in a non-aqueous electrolyte secondary battery including a wound electrode body in which a positive electrode plate and a negative electrode plate are wound through a separator, when the positive electrode plate is increased in packing density, there is a problem that cracks are generated in the positive electrode composite material layer.

Method used

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  • Method for manufacturing nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery
  • Method for manufacturing nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery
  • Method for manufacturing nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Li as the positive active material 1.054 Ni 0.199 co 0.597 mn 0.199 Zr 0.005 o 2, 5% by mass of carbon black relative to the positive electrode active material, and 2% by mass of polyvinylidene fluoride (PVdF) relative to the positive electrode active material were mixed, and N-methyl-2-pyrrolidone (NMP) was added , and stirred using a mixer (manufactured by PRIMIX Corporation, T.K.T.K.HIVIS MIX) to prepare a positive electrode composite material slurry. This slurry was coated on an aluminum foil having a thickness of 15 μm as a positive electrode core, dried, and compressed with a roll. In this way, a positive electrode plate having a thickness of 140 μm in which positive electrode composite material layers were formed on both surfaces of the positive electrode core was produced.

[0055] Graphite covered with low-crystalline carbon as the negative electrode active material, styrene butadiene rubber (SBR) that is 1% by mass relative to the negative electrode acti...

Embodiment 2～3

[0061] For Example 2 and Example 3, the amount of the binding material contained in the positive electrode composite material slurry is changed to be 3% by mass relative to the positive electrode active material and 4% by mass relative to the positive electrode active material, thereby adjusting the positive electrode Except for the hardness of the composite material layer, the positive electrode winding test and the evaluation of the wound electrode body were performed in the same manner as in Example 1. The softness indices of Example 2 and Example 3 based on the positive electrode winding test were 17 and 15, respectively.

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Abstract

The nonaqueous electrolyte secondary battery according to one embodiment of the present invention includes a flat wound electrode body in which a positive plate and a negative plate are wound via a separator and is characterized in that the positive plate has a positive core and a positive mixed material layer that is formed on both sides of the positive core, the positive mixed material layer includes a lithium metal composite oxide represented by general formula Li1+xMaO2+b (in the formula, x, a, and b satisfy the conditions x+a=1, -0.2<x <= 0.2, and -0.1<=b<=0.1, and M includes Ni and Co and at least one element selected from the group consisting of Mn and Al), and the positive plate has a flexibility index of 15 to 19. Such a positive plate is capable of having a high packing density while suppressing cracks in the positive mixed material layer and buckling of the positive plate and the negative plate.

Description

technical field [0001] The present disclosure relates to a method of manufacturing a nonaqueous electrolyte secondary battery and the nonaqueous electrolyte secondary battery. Background technique [0002] In recent years, the demand for higher capacity of non-aqueous electrolyte secondary batteries used in vehicles such as electric vehicles has increased, and there has been a need to introduce more active materials into the limited space in the battery to achieve higher packing density of the electrode plate. In particular, in a non-aqueous electrolyte secondary battery including a wound electrode body in which a positive electrode plate and a negative electrode plate are wound through a separator, when the positive electrode plate is increased in packing density, there is a problem that cracks are generated in the positive electrode composite material layer. . On the other hand, in the wound electrode body, it is known that under certain conditions, a phenomenon called bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/505H01M4/525H01M10/052H01M10/0587
CPCH01M10/0587H01M10/052H01M4/505H01M4/525H01M4/131Y02E60/10Y02P70/50H01M4/623H01M2004/021H01M2300/0017H01M10/0431H01M10/0525H01M2004/028
Inventor 赤穗笃俊曲佳文田村和明西田晶
Owner SANYO ELECTRIC CO LTD
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