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Slurries obtained using binder for cell electrodes, electrodes obtained using slurries, and lithium-ion secondary cell obtained using electrodes

A secondary battery and battery electrode technology, which is applied to battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of non-bonding and reduced charge-discharge cycle characteristics of lithium-ion secondary batteries, etc.

Inactive Publication Date: 2013-10-23
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of a slurry with a reduced amount of binder in order to increase the capacity of the battery does not allow good bonding between the active materials and the active material and the current collector, and the charge-discharge cycle characteristics of the lithium-ion secondary battery deteriorate. The problem

Method used

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  • Slurries obtained using binder for cell electrodes, electrodes obtained using slurries, and lithium-ion secondary cell obtained using electrodes

Examples

Experimental program
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Effect test

Embodiment 1）

[0074] Production of the positive electrode will be described. 90% by mass LiCoO 2 , 5% by mass of acetylene black as a conductive additive, and 5% by mass of polyvinylidene fluoride as a binder were mixed, N-methylpyrrolidone was added to the mixture, and further mixed to prepare a positive electrode slurry. The positive electrode slurry was coated on an aluminum foil with a thickness of 20 μm as a current collector so that the thickness after rolling treatment was 160 μm, dried at 120° C. for 5 minutes, and pressed to obtain a positive electrode.

[0075] The preparation of the negative electrode will be described. Mix the following: 100 parts by mass of graphite, 1 part by mass of acetylene black as a conductive additive, 1.25 parts by mass of an emulsion polymer composed of styrene-acrylate copolymer (manufactured by Showa Denko Co., Ltd., OLZ-6833-1, styrene / acrylate = 50 / 50 (mass ratio), non-volatile matter 40.0%, viscosity 20mPa s, pH 7.0, Tg (glass transition tempera...

Embodiment 2）

[0080] Except having adjusted the pH of the slurry to the value shown in Table 1 by changing the quantity of the formic acid which is a pH adjustment compound, it carried out similarly to Example 1, and obtained the slurry for lithium ion secondary battery electrodes. The evaluation results are shown in Table 1.

Embodiment 3～4）

[0082] Change the binder amount relative to the amount of active material in the negative electrode, and adjust the pH of the slurry to the value shown in Table 1 by changing the amount of formic acid as the pH adjusting compound, except that it is the same as in Example 1 To obtain the slurry for lithium ion secondary battery electrodes. The evaluation results are shown in Table 1.

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Abstract

Provided are: slurries for a lithium-ion secondary cell electrode having an excellent binding performance between active materials and between the active materials and a current collector; electrodes in which the slurries are used; and a lithium-ion secondary cell in which the electrodes are used, the lithium-ion secondary cell having both a high initial discharge capacity and superior charge-discharge cycle characteristics at high temperatures. The present invention relates to slurries for a lithium-ion secondary cell electrode, the slurries being obtained using a binder for a cell electrode and an active material and having a pH of 3.0-6.0. Preferably, the binder for a cell electrode is contained at 0.2-4.0 mass% in relation to the active material.

Description

technical field [0001] The present invention relates to a slurry for a lithium ion secondary battery electrode, an electrode for a lithium ion secondary battery obtained by using the slurry, and a lithium ion secondary battery obtained by using the electrode, and the characteristics of the slurry for a lithium ion secondary battery electrode Because it is obtained by using a binder for battery electrodes and an active material, the pH of the slurry is 3.0 to 6.0. Background technique [0002] The market for lithium-ion secondary batteries is gradually expanding with the popularity of notebook computers, mobile phones, power tools, electronic and communication equipment. In addition, recently, from the viewpoint of environmental problems, the demand for lithium secondary batteries for electric vehicles and hybrid vehicles has also increased, and among them, lithium secondary batteries with higher output, higher capacity, and higher energy density are required. [0003] Lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/13H01M4/62
CPCY02E60/12H01M4/13H01M4/622H01M10/0525H01M4/139Y02E60/10H01M4/62H01M4/621
Inventor 花崎充深濑一成伊藤大悟
Owner SHOWA DENKO KK
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