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Lithium secondary cell

A lithium secondary battery and discharge capacity technology, which is applied in the direction of secondary battery, lithium storage battery, secondary battery repair/maintenance, etc., can solve the problems of poor charge-discharge cycle characteristics and reduced electrode current collection, and achieve improved charging Effect of discharge cycle characteristics

Inactive Publication Date: 2005-05-25
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, the current collection performance in the electrode is lowered, and the charge-discharge cycle characteristics are deteriorated.

Method used

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  • Lithium secondary cell
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Examples

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Embodiment 2

[0038] Electrodes were produced in the same manner as in Example 1 except that the thickness of the silicon film was 6.7 μm. The discharge capacity per unit area of ​​the electrode is 5.26mAh / cm 2 . Using this electrode as a negative electrode, a lithium secondary battery was fabricated in the same manner as in Example 1.

Embodiment 3

[0040] Electrodes were produced in the same manner as in Example 1 except that the thickness of the silicon thin film was 10 μm. The discharge capacity per unit area of ​​the electrode is 7.86mAh / cm 2 . Using this electrode as a negative electrode, a lithium secondary battery was fabricated in the same manner as in Example 1.

Embodiment 4

[0051] A negative electrode was produced in the same manner as in Example 1, and a positive electrode was produced so that the capacity ratio of positive and negative electrodes relative to the negative electrode was 2. Using these positive and negative electrodes, a lithium secondary battery was produced in the same manner as in Example 1. The discharge capacity per unit area of ​​the positive electrode is 1.95mAh / cm 2 , the discharge capacity per unit area of ​​the negative electrode is 3.93mAh / cm 2 .

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Abstract

The present invention provides a lithium secondary battery comprising a negative electrode (3) in which a negative electrode active material film (3a) is provided on a negative electrode current collector (3b), and a positive electrode containing a positive electrode active material (1a). (1), non-aqueous electrolyte; the negative electrode active material (3a) is a material that absorbs lithium by alloying with lithium, and the ratio of the discharge capacity per unit area of ​​the negative electrode (3) to the discharge capacity per unit area of ​​the positive electrode (1) is 1.5 more than or equal to 3, and the ratio of the thickness of the negative electrode active material (3a) to the arithmetic mean roughness Ra of the surface of the negative electrode current collector (3b) is 50 or less. According to the present invention, in a lithium secondary battery in which a material that stores lithium by alloying with lithium is used as a negative electrode active material, the charge-discharge cycle characteristics are improved.

Description

technical field [0001] The present invention relates to a lithium secondary battery comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, and in particular to a lithium secondary battery using a material that absorbs lithium by alloying with lithium as a negative electrode active material. Background technique [0002] In recent years, as one of new high-output and high-energy-density secondary batteries, lithium secondary batteries that charge and discharge lithium ions by moving lithium ions between a positive electrode and a negative electrode using a non-aqueous electrolyte have been used. [0003] As an electrode for such a lithium secondary battery, an electrode using a material alloyed with lithium as a negative electrode active material is being studied. As a material alloyed with lithium, for example, silicon is being studied. However, when a material alloyed with lithium, such as silicon, occludes and releases lithium, the volume of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/38H01M4/64H01M10/05H01M10/052H01M10/42
CPCH01M4/131H01M4/134H01M4/1391H01M4/1395H01M4/386H01M4/525H01M10/052H01M2004/021H01M2010/4292Y02E60/10H01M4/02H01M10/05
Inventor 吉田智一鉾谷伸宏神野丸男樽井久树
Owner SANYO ELECTRIC CO LTD