Silicon/graphene based nanocomposite anode: large-scale production and stable high capacity for lithium ion batteries

标题

Silicon/graphene based nanocomposite anode: large-scale production and stable high capacity for lithium ion batteries

作者

作者:Hu, RZ (Hu, Renzong)^[1 ]; Sun, W (Sun, Wei)^[1 ]; Chen, YL (Chen, Yulong)^[1 ]; Zeng, MQ (Zeng, Meiqin)^[1 ]; Zhu, M (Zhu, Min)^[1 ]

期刊信息

摘要

A Si/graphene nanocomposite, with nano-Si particles tightly wrapped and connected by graphene nanosheets, was prepared on a large scale by using discharge-plasma-assisted milling (P-milling). The nanocomposite with 50 wt% Si demonstrated high capacity, good cycleability, and an excellent high-rate capability as a lithium storage anode, which delivered a discharge capacity of 866 mA h g(-1) and a coulombic efficiency above 99.0% after 200 cycles under a current density of 0.4 mA cm(-2). The capacity loss above 200 cycles was only similar to 0.07% per cycle for 0.02-2 V. The practical relevance of this anode was further confirmed by a full coin-type cell with a LiMn2O4 cathode, which could cycle with stable capacities at practical working voltages between 3.2 and 4.2 V. Moreover, micro-Si mixed with WC and graphite was also treated by P-milling to form a "core-shell-shell" Si-WC/graphene nanocomposite with better cycleablity. These superior electrochemical properties were attributed to the highly enhanced structural stability and conductivity of the nanocomposite electrodes due to the complete coating of the micro/nano-Si particles by graphene nanosheets. The present Si/graphene based nanocomposite may have good potential for large-scale applications because of the cost-effective and easy scalability of its synthesis by P-milling processes.

关键词

KeyWords Plus:SILICON-GRAPHITE COMPOSITES; NANO-SI COMPOSITE; RECHARGEABLE BATTERIES; NEGATIVE ELECTRODES; PURE METALS; PERFORMANCE; GRAPHENE; ALLOY; INSERTION; REDUCTION

作者信息

作者信息

通讯作者地址:Zhu, M (通讯作者)

S China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510640, Peoples R China.   增强组织信息的名称     South China University of Technology

地址:

[ 1 ] S China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510640, 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

ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND

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