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Lithium secondary battery

A lithium secondary battery, porous layer technology, applied in secondary batteries, lithium storage batteries, battery electrodes, etc., can solve problems such as micro-short circuit and reduced Coulombic efficiency, and achieve the effects of improved safety, improved diaphragm strength, and high capacity

Inactive Publication Date: 2007-09-26
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This expansion and contraction of the negative active material has many adverse effects on the reliability and electrical characteristics of the battery
[0004] For example, when Si is used as an anode active material in a battery, a micro-short circuit may occur during charging / discharging, resulting in a decrease in the Coulombic efficiency at the initial stage

Method used

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  • Lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] (1) Preparation of negative electrode active material

[0082] 2.5 kg of Ti-Si alloy (mixing weight ratio Ti:Si=37:63) obtained by the melting method and 300 kg of stainless steel balls with a diameter of 1 inch were placed in a vibrating ball mill (available from Chuo Kakohki Industries, Ltd. FV-30) stainless steel container. The container is then covered, which has an internal volume of 95 liters. After the container was evacuated, argon was introduced into the container until it reached 1 atmosphere. Subsequently, the amplitude of the vibrating ball mill was set to 8 mm and the rotation speed of the drive motor was set to 1200 rpm, and mechanical alloying was performed for 72 hours to obtain composite particles a1 containing Ti and Si.

[0083] In addition, Co-Si alloy (Co:Si=41:59), Ni-Si alloy (Ni:Si=41:59), Fe-Si alloy (Fe:Si=39:61) were used under the same conditions. , Ti-Si alloy (Ti:Si=9:91) and Cu-Si alloy (Cu:Si=20:80) to prepare composite particles a2 containin...

Embodiment 1

[0120] Using an 18 μm thick porous polyethylene sheet, a 20 μm thick separator s6 including a laminate of an aramid layer and a polyethylene layer was prepared in the same manner as in Example 1. The content of the aramid layer in the separator s6 is 5 parts by weight per 100 parts by weight of the polyethylene layer. Using the separator s6 and the negative electrode A8, the battery 15 was prepared in the same manner as in Example 1.

Embodiment 2

[0122] An 8 μm thick Si film was formed on each side of the current collector including an 18 μm thick electrolytic copper foil by RF sputtering. In particular, the current collector is fixed to the drum in the vacuum chamber of the RF magnetron sputtering device, and the vacuum chamber is evacuated to 8×10 -4 Pa or less. While introducing argon gas at a flow rate of 50 sccm from the inlet, sputtering was performed. The RF power is 350W.

[0123] Using the negative electrode including the Si thin film thus prepared and the separator s6, the battery 16 was prepared in the same manner as in Example 1.

[0124] Using the negative electrode including the Si thin film thus prepared and the separator s1, the battery 17 was prepared in the same manner as in Example 1.

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Abstract

Disclosed is a high-capacity lithium secondary battery having excellent safety wherein expansion of a negative electrode active material during charging is suppressed and the ratio of a heat-resistant resin contained in a separator is higher than the conventional batteries. Specifically disclosed is a lithium secondary battery wherein compound particles containing at least one metal element selected from the group consisting of Si, Sn, Al and Zn are used as a negative electrode active material, a separator comprises a first porous layer composed of a polyolefin and a second porous layer composed of a heat-resistant resin, and 10-60 parts by weight of the second porous layer is contained per 100 parts by weight of the first porous layer.

Description

Technical field [0001] The present invention relates to a lithium secondary battery, and more specifically, to a negative electrode active material and a separator of a lithium secondary battery. Background technique [0002] Nickel-cadmium storage batteries and nickel-metal hydride storage batteries have been mainly used as power sources for driving AV equipment, notebook personal computers, and portable communication equipment. However, in recent years, these electronic devices have become wireless and more portable, and therefore, there is a need for secondary batteries with higher energy density. This need has led to the development of lithium secondary batteries that are compact and lightweight, capable of rapid charging, and have higher energy density. [0003] In order to obtain higher energy density, for example, various materials used as positive electrode active materials and negative electrode active materials have been studied. Graphite carbon mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M2/16H01M4/02H01M4/38H01M4/58B22F1/12H01M4/134H01M4/52H01M4/525H01M4/587H01M10/052H01M10/36H01M50/414
CPCY02T10/7011B22F2998/00H01M10/052H01M4/58H01M4/42H01M4/525H01M4/463H01M4/38C22C1/0491H01M4/587C22C32/0084H01M4/134H01M2004/027H01M10/4235C04B2235/428Y02E60/122C04B2235/404H01M2/1673H01M2/1653C04B35/532C04B35/58092B22F1/0003H01M4/364H01M4/386H01M4/387Y02E60/10H01M50/46Y02P70/50H01M50/414B22F1/12C22C1/047B22F1/07B22F2009/043B22F9/002H01M4/583B82Y30/00H01M50/489H01M50/417H01M50/449Y02T10/70
Inventor 武泽秀治笠松真治
Owner PANASONIC CORP
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