期刊
JOURNAL OF POWER SOURCES
卷 348, 期 -, 页码 302-310出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2017.03.020
关键词
Micro Si; Nanoscale primary particles; High tap density; High capacity; Lithium-ion batteries
资金
- Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government Ministry of Trade, Industry and Energy [20154010200840]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea [20152000000650]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20154010200840, 20152000000650] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Silicon (Si)-based materials have attracted significant research as an outstanding candidate for the anode material of lithium-ion batteries. However, the tremendous volume change and poor electron conductivity of bulk silicon result in inferior capacity retention and low Coulombic efficiency. Designing special Si with,high energy density and good stability in a bulk electrode remains a significant challenge. In this work, we introduce an ingenious strategy to modify micro silicon by designing a porous structure, constructing nanoparticle blocks, and introducing carbon nanotubes as wedges. A disproportion reaction, coupled with a chemical etching process and a ball-milling reaction, are applied to generate the desired material. The as-prepared micro silicon material features porosity, small primary particles, and effective CNT-wedging, which combine to endow the resultant anode with a high reversible specific capacity of up to 2028.6 mAh g(-1) after 100 cycles and excellent rate capability. The superior electrochemical performance is attributed to the unique architecture and optimized composition. (C) 2017 Elsevier B.V. All rights reserved.
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