期刊
JOURNAL OF POWER SOURCES
卷 342, 期 -, 页码 521-528出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.12.091
关键词
Lithium-ion battery; Germanium anode; Double carbon protection; Strong adhesion; Dopamine
资金
- National Science Foundation of China [51432010, JCKY20161308010]
- Science and Technology Commission of Shanghai Municipality [14JC1493000, 15DZ2281200]
Germanium is considered as a promising anode material for lithium ion batteries (LIBs) due to its high capacity. However, owing to the huge volume variation during cycling, the batteries based on germanium anodes usually show poor cyclability and inferior rate capability. Herein, we demonstrated a novel strategy to uniformly anchor the core-shell structured germanium@carbon (Ge@C) on the reduced graphene oxide (rGO) nanosheets by the strong adhesion of dopamine. In the resulting Ge@C/rGO hybrid, the amorphous carbon layer and rGO nanosheets can effectively reduce the agglomeration of germanium and provide buffer matrix for the volume change in electrochemical lithium reactions. When used as anode materials for LIBs, Ge@C/rGO hybrids deliver a reversible capacity of 1074.4 mA h g(-1) at 2C after 600 cycles (with capacity retention of 96.5%) and high rate capability of 436 mA h g-1 at 20C after 200 cycles. The encouraging electrochemical performance clearly demonstrates that Ge@C/rGO hybrids could be a potential anode material with high capacity, excellent rate capability, and good cycling stability for LIBs. (C) 2016 Elsevier B.V. All rights reserved.
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