Lithium secondary battery and method for producing same

A lithium battery and recharging technology, used in secondary batteries, electrode manufacturing, lithium storage batteries, etc., can solve the problems of powdering, reducing electrode current collection capacity, shedding, etc. Effect

Inactive Publication Date: 2007-11-07
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case of using a lithium alloy material such as silicon as a negative electrode active material, since the volume of the active material expands or contracts when storing or releasing lithium, the active material is pulverized or released from the current collector during charge and discharge. fall off
This reduces the current collection capacity of the electrode and thus degrades the charge-discharge cycle performance characteristics, which has become a problem

Method used

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  • Lithium secondary battery and method for producing same
  • Lithium secondary battery and method for producing same
  • Lithium secondary battery and method for producing same

Examples

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Embodiment Construction

[0098] The invention is illustrated in more detail below by way of examples. The following examples are provided merely to illustrate the practice of the invention and are not intended to limit it. Appropriate changes and modifications can be made without departing from the scope of the present invention.

[0099] (Experiment 1)

[0100] (manufacture of negative electrode)

[0101] Copper is electrolytically deposited on the surface of a heat-resistant rolled copper alloy foil consisting of a zirconium-copper alloy (0.015-0.03 wt.% zirconium content) to provide a roughened, heat-resistant copper alloy foil (having an arithmetic average roughness Ra of 0.25 μm, and a thickness of 31 μm) was used as a current collector. A thin film of amorphous silicon was deposited onto the current collector using the sputtering setup shown in FIG. 5 .

[0102] As shown in FIG. 5, a rotating cylindrical substrate holder 2 is housed in the chamber 1. As shown in FIG. The current collector i...

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Abstract

A lithium secondary battery comprising a negative electrode composed of a collector on which an amorphous silicon thin film or an amorphous thin film mainly containing silicon is deposited, a positive electrode, and a nonaqueous electrolyte is characterized in that carbon dioxide is dissolved in the nonaqueous electrolyte.

Description

technical field [0001] The present invention relates to a rechargeable lithium battery and a manufacturing method thereof. Background technique [0002] As a new type of high-power and high-energy-density rechargeable battery, rechargeable lithium batteries have recently been applied, which pass lithium ions in a non-aqueous electrolyte solution between the positive electrode and the negative electrode Migration for charging and discharging. [0003] For such a rechargeable lithium battery, a negative electrode using a lithium alloy material such as silicon as a negative active material has been studied. However, in the case of using a lithium alloy material such as silicon as a negative electrode active material, since the volume of the active material expands or contracts when storing or releasing lithium, the active material is pulverized or released from the current collector during charge and discharge. fall off. This lowers the current collection capacity of the ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M4/02H01M4/04H01M4/38H01M4/64H01M4/66H01M4/134H01M10/052H01M10/0567H01M10/0568H01M10/0585H01M10/42
CPCH01M4/525H01M4/661H01M10/0567H01M10/0569H01M4/131H01M10/0568H01M10/052H01M4/134Y02E60/122Y02E60/10Y02P70/50
Inventor 地藤大造田村宜之鉾谷伸宏南博之八木弘雅神野丸男佐山胜信加藤善雄松田茂树
Owner SANYO ELECTRIC CO LTD
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