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Electrode for non-aqueous electrolyte secondary battery, manufacturing method therefor, and non-aqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in non-aqueous electrolyte battery electrodes, electrode manufacturing, battery electrodes, etc., can solve the problem of insufficient filling rate of the mixture layer, and achieve the effect of excellent charge and discharge capacity

Inactive Publication Date: 2010-08-25
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the manufacturing process of the positive electrode and the negative electrode, the film of the mixture paste is generally compressed (rolled), but the filling rate of the mixture layer is not sufficient

Method used

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  • Electrode for non-aqueous electrolyte secondary battery, manufacturing method therefor, and non-aqueous electrolyte secondary battery
  • Electrode for non-aqueous electrolyte secondary battery, manufacturing method therefor, and non-aqueous electrolyte secondary battery
  • Electrode for non-aqueous electrolyte secondary battery, manufacturing method therefor, and non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] (a) Preparation of positive electrode

[0108] "Cellseed N (trade name)" (lithium nickelate, LiNiO 2 ) 3 kg, 1 kg of "#1320 (trade name)" (NMP solution containing 12% by weight of PVDF) manufactured by Kureha Co., Ltd. as a positive electrode binder, 90 g of acetylene black as a conductive material, and an appropriate amount of NMP as a solvent ( N-methyl-2-pyrrolidone) is stirred with a double-arm type kneading machine, and is modulated into a positive electrode mixture paste.

[0109] The first active material particles had an average particle diameter (D50) of 11 μm and an average circularity of 0.97, and the compressive breaking strength of particles having a particle diameter of 11 μm and a circularity of 0.97 was 77 MPa.

[0110] The positive electrode mixture paste was applied to both sides of a 15-μm-thick aluminum foil as a positive electrode current collector except for the junction of the positive electrode lead, and dried to form a film. Then, the film was...

Embodiment 2

[0126] In order to increase the mechanical strength of the first active material particles, heating in an air atmosphere was performed at a temperature of 750° C. for 50 hours. As a result, the first active material particles had an average particle diameter of 11 μm and an average circularity of 0.99, and the compressive breaking strength of particles having a particle diameter of 11 μm and a circularity of 0.97 was 94 MPa. Furthermore, the interval between the rollers during compression was set to 70 μm to adjust the compressive stress, and control {(D 0 -D 1 ) / D 0}×100 is 20%. Except for this, a lithium ion secondary battery was produced in the same manner as in Example 1.

Embodiment 3

[0128] Set the interval between the rollers during compression to 20 μm to adjust the compressive stress, and control {(D 0 -D 1 ) / D 0}×100 is 40%. Except for this, a lithium ion secondary battery was produced in the same manner as in Example 2.

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Abstract

Provided are an electrode for a non-aqueous electrolyte secondary battery and the manufacturing method therefor, wherein the electrode includes a collector and a mixture layer formed on the surface of the collector. The mixture layer includes an active material and a binder. The active material includes roughly spherical first active material particles and non-spherical second active material particles. The second active material particles are pulverized first active material particles and fill the gaps between the first active material particles. An electrode for a non-aqueous electrolyte secondary battery with a larger filling ratio of the mixture layer than a conventional electrode is obtained.

Description

technical field [0001] The present invention relates to an electrode for a nonaqueous electrolyte secondary battery and a nonaqueous electrolyte secondary battery. More specifically, it relates to an improvement of a mixture layer contained in an electrode for a nonaqueous electrolyte secondary battery. Background technique [0002] Nonaqueous electrolyte secondary batteries including lithium ion secondary batteries are widely used as power sources for portable devices such as computers, mobile phones, digital cameras, and video cameras. Non-aqueous electrolyte secondary batteries have a high energy density, but development of non-aqueous electrolyte secondary batteries with higher energy density is underway as, for example, a driving power source for electric vehicles in consideration of environmental issues and resource issues. [0003] The non-aqueous electrolyte secondary battery has: a positive electrode comprising a positive electrode collector and a positive electrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/04H01M4/36H01M4/52H01M4/13H01M4/131H01M4/139
CPCY02E60/122H01M4/139H01M4/131H01M4/525H01M2004/021Y02E60/10
Inventor 冈村一广南野哲郎
Owner PANASONIC CORP