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Electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery having same

A non-aqueous electrolyte and secondary battery technology, applied in non-aqueous electrolyte battery electrodes, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of inability to obtain high discharge capacity, and difficulty in intercalation and deintercalation of lithium ions. Achieve the effect of improving lithium ion acceptance and good output and input characteristics

Inactive Publication Date: 2012-02-22
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Patent Document 3 states that if a carbon material is used together with lithium titanium oxide in one battery, intercalation and deintercalation of lithium ions from the carbon material become difficult to occur, and a high discharge capacity cannot be obtained.

Method used

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  • Electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery having same
  • Electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery having same
  • Electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery having same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (production of negative electrode)

[0065] (i) The first negative electrode mixture paste

[0066] Artificial graphite (average particle diameter of 10 μm, BET specific surface area of ​​3 m) as the first active material 2 / g) 3kg, BM-400B (a dispersion of modified styrene-butadiene rubber with a solid content of 40% by weight) produced by Japan Zeon Co., Ltd. 200g, 50g of carboxymethylcellulose (CMC) and an appropriate amount of The water was stirred together by a double-arm kneader, and the first negative electrode mixture paste containing graphite was prepared. The first negative electrode mixture paste was coated on both sides of a negative electrode current collector made of copper foil with a thickness of 10 μm, dried, and rolled so that the total thickness was 50 μm to form a first layer. That is, the thickness (T1) of the first layer is set to 20 μm on each side of the copper foil, and the density of the first layer is set to 1.3 g / cm 3 .

[0067] (ii) The ...

Embodiment 2

[0086] Except that the thickness T1 of the first layer and the thickness T2 of the second layer were set to 300 μm and 4 μm, respectively, a negative electrode was produced in the same manner as in Example 1, and a cylindrical nonaqueous electrolyte secondary battery was further produced and evaluated. .

Embodiment 3

[0088] Except that the thickness T1 of the first layer and the thickness T2 of the second layer were set to 200 μm and 4 μm, respectively, a negative electrode was produced in the same manner as in Example 1, and a cylindrical nonaqueous electrolyte secondary battery was further produced and evaluated. .

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Abstract

Disclosed is an electrode for nonaqueous electrolyte secondary batteries which is equipped with an active material layer containing a sheet-shaped collector, and a first layer and second layer deposited in order on the surface thereof. The first layer contains a carbon material which reversibly absorbs or desorbs lithium ions at a first voltage. The second layer contains a transition metal oxide which reversibly absorbs or desorbs lithium ions at a second voltage higher than the first voltage. The difference between the first voltage and the second voltage is at least 0.1V, and the ratio (T1 / T2) of the thickness (T1) of the first layer and the thickness (T2) of the second layer is 0.33-75.

Description

technical field [0001] The present invention relates to an electrode for a nonaqueous electrolyte secondary battery. Specifically, it relates to an electrode for a nonaqueous electrolyte secondary battery containing a plurality of active materials having different potentials for intercalating and deintercalating lithium ions. Background technique [0002] In recent years, the demand for non-aqueous electrolyte secondary batteries has been expanding as a driving power source for portable electronic devices, hybrid vehicles, electric vehicles, and the like. A nonaqueous electrolyte secondary battery represented by a lithium ion battery is lightweight, and has high electromotive force and high energy density. [0003] A positive electrode of a lithium ion battery contains, for example, a lithium-containing composite oxide as a positive electrode active material. The negative electrode contains, for example, a carbon material as a negative electrode active material. Among carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/131H01M4/133H01M4/485H01M10/0525
CPCH01M4/131H01M4/133H01M4/136H01M4/485H01M4/5825H01M10/0525H01M10/0587H01M2004/021Y02E60/10H01M4/13H01M4/48H01M4/583H01M10/05Y02T10/70
Inventor 名仓健祐
Owner PANASONIC CORP