期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 42, 页码 23501-23506出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b05970
关键词
anode; silicon; Coulombic efficiency; interface stability; lithium-ion battery
资金
- National Key Project on Basic Research [2013CB934000, 2015CB251104]
- National International Science and Technology Cooperation Project [2012DFG61480]
- China-Germany Electric Vehicle Project [2011AA11A290]
- China-US Electric Vehicle Project [2010DFA72760]
- Beijing Natural Science Foundation [2120001]
- Tsinghua University independent research program [20111081039]
Silicon has been considered as a promising anode material for the next generation of lithium-ion batteries due to its high specific capacity. Its huge volume expansion during the alloying reaction with lithium spoils the stability of the interface between electrode and electrolyte, resulting in capacity degradation. Herein, we synthesized a novel hollow structured silicon material with interior space for accumulating the volume change during the lithiation. The as-prepared material shows excellent cycling stability, with a reversible capacity of similar to 1650 m Ah g(-1) after 100 cycles, corresponding to 92% retention. The electrochemical impedance spectroscopy and differential scanning calorimetry were carried out to monitor the growth of SEI film, and the results confirm the stable solid electrolyte interphase film on the surface of hollow structured silicon.
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