Silicon/Wolfram Carbide@Graphene composite: enhancing conductivity and structure stability in amorphous-silicon for high lithium storage performance

标题

Silicon/Wolfram Carbide@Graphene composite: enhancing conductivity and structure stability in amorphous-silicon for high lithium storage performance

作者

作者:Sun, W (Sun, Wei)^[1,2 ]; Hu, RZ (Hu, Renzong)^[1,2 ]; Liu, H (Liu, Hui)^[1,2 ]; Zhang, HY (Zhang, Hanying)^[1,2 ]; Liu, JW (Liu, Jiangwen)^[1,2 ]; Yang, LC (Yang, Lichun)^[1,2 ]; Wang, HH (Wang, Haihui)^[3 ]; Zhu, M (Zhu, Min)^[1,2 ]

期刊信息

摘要

Improving the electron conductivity and lithiated structure stability for Si anodes can result in high stable capacity in cells. A Silicon/Wolfram Carbide@Graphene (SW@G) composite anode is designed and produced by a simple two-step ball milling the mixture of coarse-grained Si with good conductive wolfram carbide (WC) and graphite. The SW@G composite consists of multiple-scale WC particles, which are uniformly distributed in amorphous Si matrices, and wrapped by graphene nanosheets (GNs) on the outside. Owing to the unique concrete-like core-shell structure, the wrapping of GNs on the Si improves the conductivity and structural stability of the composite. The inner WC particles which tightly connect the Si and graphene act as the cornerstone to resist large volumetric expansion of Si during charge/discharge, and in particular serve as the high-speed channels of electrons as well as provide more interface paths for Li+ to accelerate their transfer inside the Si. These contribute to the excellent electrochemical properties of SW@G composite anode, including high volumetric capacity (three times higher than that of graphite), superior rate capability, and long-life stable cycleability. The synthetic method developed in this work paves the way for large-scale manufacturing of high performance Li storage anodes using commercially available materials and technologies. (C) 2016 Elsevier Ltd. All rights reserved.

关键词

作者关键词:Lithium ion batteries; Anode; Amorphous silicon; Wolfram carbide; Ball milling

作者信息

作者信息

通讯作者地址:Hu, RZ (通讯作者)

S China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Guangdong, Peoples R China.   增强组织信息的名称     South China University of Technology

通讯作者地址:Hu, RZ (通讯作者)

Aus China Joint Lab Energy & Environm Mat, Guangzhou 510641, Guangdong, Peoples R China.

地址:

	[ 1 ] S China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Guangdong, Peoples R China   增强组织信息的名称     South China University of Technology
	[ 2 ] Aus China Joint Lab Energy & Environm Mat, Guangzhou 510641, Guangdong, Peoples R China
	[ 3 ] S China Univ Technol, Sch Chem & Chem Engn, Guangzhou 510641, Guangdong, Peoples R China   增强组织信息的名称     South China University of Technology

电子邮件地址:msrenzonghu@scut.edu.cn

出版商

PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND

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