In-situ growth of silicon nanowires on graphite by molten salt electrolysis for high performance lithium-ion batteries

被引：11

作者：

Yu, Zhanglong ^{[1
]}

Fang, Sheng ^{[1
]}

Wang, Ning ^{[1
]}

Shi, Bimeng ^{[1
]}

Hu, Yicheng ^{[1
]}

Shi, Zhixia ^{[2
,4
]}

Shi, Dong ^{[1
]}

Yang, Juanyu ^{[1
,3
,4
]}

机构：

[1] China Automot Battery Res Inst Co Ltd, Beijing 100088, Peoples R China

[2] GRINM Resources & Environm Tech Co Ltd, Beijing 100088, Peoples R China

[3] Natl Engn Res Ctr Rare Earth Mat, Beijing 100088, Peoples R China

[4] Gen Res Inst Nonferrous Met, Beijing 100088, Peoples R China

来源：

MATERIALS LETTERS | 2020年 / 273卷

关键词：

Silicon nanowires; Nanocomposites; Molten salt electrolysis; Lithium-ion batteries; Energy storage and conversion; Metallurgy; ELECTROCHEMICAL REDUCTION; ANODE; DIOXIDE;

D O I：

10.1016/j.matlet.2020.127946

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Application of silicon is limited by the great volume change during lithium insertion/extraction process, which causes a rapid capacity reduction in lithium-ion batteries. In this study, silicon nanowires were in-situ grown on graphite surface by molten salt electrolysis. Meanwhile, silicon carbides were formed and serving as the connections between silicon and graphite. After being coated by carbon, the prepared silicon nanowires/graphite@carbon composite with an initial capacity of about 674.4 mAh/g demonstrates a capacity retention of 90.04% after 100 cycles (at 0.5C) in coin-type cell tests. This study offers an effective method to prepare high performance silicon-based material for lithium-ion batteries. (C) 2020 Elsevier B.V. All rights reserved.

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