Binding of carbon coated nano-silicon in graphene sheets by wet ball-milling and pyrolysis as high performance anodes for lithium-ion batteries

标题

Binding of carbon coated nano-silicon in graphene sheets by wet ball-milling and pyrolysis as high performance anodes for lithium-ion batteries

作者

作者:Sun, W (Sun, Wei)^[1 ]; Hu, RZ (Hu, Renzong)^[1 ]; Zhang, M (Zhang, Miao)^[1 ]; Liu, JW (Liu, Jiangwen)^[1 ]; Zhu, M (Zhu, Min)^[1 ]

期刊信息

摘要

A novel approach has been developed to prepare silicon@carbon/graphene sheets (Si@C/G) composite with a unique structure, in which carbon coated Si nanoparticles are uniformly dispersed in a matrix of graphene sheets, to enhance the cycleability and electronic conductivity of Si-based anodes for Li-ion batteries. In this study, Si nanoparticles and expanded graphite (EG) are treated by combining high-energy wet ball-milling in sucrose solution with subsequent pyrolysis treatment to produce this Si@C/G composite. To achieve better overall electrochemical performance, the carbon content of the composites is also studied systematically. The as-designed Si-30@C-40/G(30) (Si:C:G = 30:40:30, by weight) composite exhibits a high Li-storage capacity of 1259 mAh g(-1) at a current density of 0.2 A g(-1) in the first cycle. Further, a stable cycleability with 99.1/88.2% capacity retention from initial reversible charge capacity can be achieved over 100/300 cycles, showing great promise for batteries applications. This good electrochemical performance can be attributed to the uniform coating and binding effect of pyrolytic carbon as well as the network of graphene sheets, which increase the electronic conductivity and Li+ diffusion in the composite, and effectively accommodated the volume change of Si nanoparticles during the Li+ alloying and dealloying processes. (C) 2016 Elsevier B.V. All rights reserved.

关键词

作者关键词:Lithium ion batteries; Silicon anode; Graphene sheets; Wet ball-milling

作者信息

作者信息

通讯作者地址:Zhu, M (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

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

电子邮件地址:memzhu@scut.edu.cn

出版商

ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS

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