Characteristics and structural change of layered polysilane (Si6H6) anode for lithium ion batteries

被引：32

作者：

Kumai, Yoko ^{[1
]}

Shirai, Soichi ^{[1
]}

Sudo, Eiichi ^{[1
]}

Seki, Juntaro ^{[1
]}

Okamoto, Hirotaka ^{[1
]}

Sugiyama, Yusuke ^{[1
]}

Nakano, Hideyuki ^{[1
]}

机构：

[1] Toyota Cent Res & Dev Labs Inc, Frontier Res Ctr, Aichi 4801192, Japan

来源：

JOURNAL OF POWER SOURCES | 2011年 / 196卷 / 03期

关键词：

Silicon nanosheet; Layered polysilane; Electrode; Lithium ion battery; Raman spectroscopy; HIGH-CAPACITY; SILICON;

D O I：

10.1016/j.jpowsour.2010.08.040

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Layered polysilane (Si(6)H(6)) has a graphite-like structure with higher capacity than crystalline silicon. The rate of increase of the thickness of a layered polysilane electrode after 10 charge-discharge cycles was smaller than that for a Si powder electrode, although the layered polysilane electrode has higher capacity. The structural changes of electrochemically lithiated and delithiated layered polysilane at room temperature were studied using scanning electron microscopy, X-ray diffraction and Raman spectroscopy. Layered polysilane became amorphous by insertion of lithium to 0V, whereas insertion of lithium into crystalline silicon produces Li(15)Si(4). Layered polysilane maintained an amorphous state during lithium insertion and deinsertion, whereas silicon changed between Li(15)Si(4) and amorphous Li(x)Si, which explains the smaller volume change of a layered polysilane electrode compared with a Si powder electrode. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：1503 / 1507

页数：5

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