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Nonaqueous electrolyte secondary battery and method for producing the same

A non-aqueous electrolyte, secondary battery technology, applied in secondary battery manufacturing, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve problems such as buckling that cannot be avoided, and achieve buckling suppression and excellent cycle life characteristics. Effect

Inactive Publication Date: 2009-11-04
PANASONIC CORP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] However, when the battery is housed in a rectangular battery case with the electrode group wound into a flat shape, even if the above-mentioned negative electrode active material or negative electrode current collector is provided with the function of relaxing stress, the length of the electrode group in the longitudinal direction Flat parts sometimes cannot avoid buckling

Method used

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  • Nonaqueous electrolyte secondary battery and method for producing the same
  • Nonaqueous electrolyte secondary battery and method for producing the same
  • Nonaqueous electrolyte secondary battery and method for producing the same

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Embodiment

[0075] Hereinafter, examples of the present invention are given to further illustrate the constitution and effect of the present invention, but the present invention is not limited by these examples.

[0076] Make according to the following essentials figure 1 The non-aqueous electrolyte secondary battery shown, and the cycle life characteristics were evaluated.

[0077] (1) Production of negative plate

[0078] A graphite crucible and an electron gun filled with metal Si (purity: 99.999%, manufactured by Furuuchi Chemical Co., Ltd., blank) were installed in a vacuum evaporation apparatus. Electrodeposited copper foil (manufactured by Furukawa Salkittofoil Co., Ltd., thickness 20 μm) as current collector 4 is introduced from a roll into the vacuum evaporation device at a constant speed (5 cm / min), and Oxygen gas with a purity of 99.7% (manufactured by Nippon Oxygen Co., Ltd.) was supplied from the nozzle to the surface of the current collector 4 at a flow rate of 80 sccm, an...

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Abstract

The present invention provides a negative active material which can also inhibit the buckling cuased by expansion and shrinkage of the negative active material, in a nonaqueous electrolyte secondary battery with flat electrode group by winding, even the negative active material uses high content material, a nonaqueous electrolyte secondary battery with good long service life property, and a method for manufacturing thereof. The nonaqureous electrolyte secondary battery includes an electrode group in which a positive electrode plate (3) including a positive electrode active material (2) formed on a positive electrode current collector (1) and a negative electrode plate (6) including a negative electrode active material (5) formed on a negative electrode current collector (4) are wound with a separator interposed therebetween, and a tensile elongation rate of the positive electrode plate (3) is larger than a tensile elongation rate of the negative electrode plate (6).

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery using a high-capacity material such as silicon as a negative electrode active material and a method for manufacturing the same. Background technique [0002] At present, the practical capacity of graphite commonly used as the negative electrode active material of non-aqueous electrolyte secondary batteries has reached about 350 mAh / g, which is quite close to the theoretical capacity (372 mAh / g) of graphite. Therefore, in order to realize a high-capacity battery capable of satisfying the high functionality of mobile devices and the like, a negative electrode active material with a larger capacity is required. [0003] Therefore, silicon (Si) or tin (Sn), or compounds thereof are attracting attention as high-capacity materials. These elements can electrochemically intercalate and deintercalate lithium ions, enabling very high-capacity charge and discharge compared to graphite. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/38H01M4/02H01M4/04H01M4/36H01M2/02H01M4/13H01M4/139H01M10/0587
CPCH01M10/0431Y02E60/122H01M4/1395H01M4/134H01M4/0404H01M10/0587Y10T29/49108Y02E60/10Y02P70/50
Inventor 木下昌洋宇贺治正弥村冈芳幸
Owner PANASONIC CORP
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