期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 1, 期 47, 页码 15068-15075出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta13616g
关键词
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资金
- National Natural Science Foundation of China
- Chinese Academy of Sciences (CAS)
- Shenzhen Municipal Special Fund for the Development of Strategic Emerging Industries [JCYJ 20120831152211489]
A nanostructured silicon/porous carbon spherical composite was prepared by a simple hydrothermal method using glucose as a carbon source and Pluronic F127 as a soft template/pore forming agent in the presence of silicon nanoparticles, and a subsequent carbonization process. In this composite, silicon nanoparticles were individually and separately coated with a porous carbon shell with a thickness of 15-20 nm and a pore size of 3-5 nm. The composite electrode exhibited excellent cycling stability and rate capability, delivering a stable capacity of 1607 mA h g(-1) at a current density of 0.4 A g(-1) after 100 cycles, and a reversible capacity of 1050 mA h g(-1) even at a high current density of 10 A g(-1). Detailed analysis of cyclic voltammetry and electrochemical impedance spectroscopy revealed that the composite showed favorable electrochemical kinetics due to the nano-sized porous carbon shell, which facilitated the formation of a solid electrolyte interface film and the transportation of Li ions and electrons, and decreased the charge transfer resistance, thus significantly improving the electrochemical performance compared with the bare nano-Si electrode.
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