期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 2, 期 34, 页码 13859-13867出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta02246g
关键词
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资金
- National Natural Science Foundation [21001082, 21273161, 21101117]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning [2013-13]
- Shanghai Innovation program [13ZZ026]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars of SEM
- Key Laboratory for Ultrafine Materials of Ministry of Education
- East China University of Science and Technology
- Fundamental Research Funds for the Central Universities
The silicon material is the most promising candidate for developing new-generation lithium-ion batteries with high energy and power output. However, there remains a significant challenge due to poor electrical conductivity and pulverization of the silicon based anode during cycles. Aiming to solve these problems, in this work we fabricate a novel 3D composite architecture made of a Si@SiOx core-shell nanowire array grown on a 3D graphitic foam (Si CNW-3D GF) substrate by a well-designed multiple-step approach. The prepared Si CNW-3D GF composite shows the integrated advantages for high-performance lithium ion batteries, including its light weight, open macroporosity, high conductivity, high Si NW loading, excellent flexibility as well as SiOx buffer layers. As a result, the Si CNW-3D GF composite exhibits excellent performance such as high reversible lithium storage capacity (3603 mA h g(-1) at a current density of 840 mA g(-1)), excellent cycling performance (up to 100 cycles) and superior rate capability (2299 mA h g(-1) at 4200 mA g(-1) and 1206 mA h g(-1) at 8400 mA g(-1)), which is 2 times that of the Si CNW electrode where Si CNWs were grown directly on a stainless steel current collector without the presence of 3D GF.
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