Novel silicon-tungsten oxide-carbon composite as advanced negative electrode for lithium-ion batteries

被引：9

作者：

Kim, Hyun-seung ^{[1
,2
]}

Kim, Jongjung ^{[1
,2
]}

Lee, Jae Gil ^{[1
,2
]}

Ryu, Ji Heon ^{[3
]}

Kim, Jaekwang ^{[4
]}

Oh, Seung M. ^{[1
,2
]}

Yoon, Songhun ^{[4
]}

机构：

[1] Seoul Natl Univ, Chem & Biol Engn, Seoul 151744, South Korea

[2] Seoul Natl Univ, WCU Program Chem Convergence Energy & Environm C2, Seoul 151744, South Korea

[3] Korea Polytech Univ, Grad Sch Knowledge Based Technol & Energy, 2121 Jeongwang Dong, Siheung Si 429793, Gyeonggi Do, South Korea

[4] Chung Ang Univ, Sch Integrat Engn, 221 Heukseok Dong, Seoul 156756, South Korea

来源：

SOLID STATE IONICS | 2018年 / 314卷

基金：

新加坡国家研究基金会;

关键词：

Alloying reaction; Negative electrode; Conversion reaction; Tungsten oxide; Chemical synthesis; SECONDARY BATTERIES; ANODES; CHEMISTRY; CHALLENGES; LITHIATION; NANOWIRE; FAILURE; POWDER; SIZE;

D O I：

10.1016/j.ssi.2017.11.013

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：

A cheap Si powder byproduct from solar cell production was applied as a negative electrode for lithium-ion batteries. To improve the cycle and rate performances, the as-obtained Si powder was composited with tungsten oxide and coated with carbon, in sequence. After preparing the composite material, its electrochemical performance is evaluated, which exhibits a high reversible capacity of 975 mA h g(-1) with improved cycleability. Especially, the rate capability is significantly improved to 390 mA h g(-1) under 1000 mA g(-1) applied current. This advanced electrochemical performance is attributed to the matrix effect of the formed Li2O and W metal with carbon coating, as identified using ex-situ X-ray diffraction experiments, and associated with the low polarization resistance observed in the galvanostatic charge intermittent technique.

引用

页码：41 / 45

页数：5

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