1. Formation, lithium storage properties, and mechanism of nanoporous germanium fabricated by dealloying.
- Author
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Wang, Shengzhen, Ma, Wensheng, Yang, Wanfeng, Bai, Qingguo, Gao, Hui, Peng, Zhangquan, and Zhang, Zhonghua
- Subjects
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GERMANIUM , *ELECTRIC batteries , *LITHIATION , *LITHIUM-ion batteries , *X-ray diffraction , *ANODES - Abstract
Germanium (Ge) has become a promising anode material for lithium-ion batteries (LIBs) due to its high theoretical capacity and decent electron/ion conductivity, but it exhibits inferior lifespan caused by dramatic volume variations during the (de)lithiation process. Herein, hierarchically, nanoporous Ge (np-Ge) was fabricated by the combination of selective phase corrosion with chemical dealloying. As an anode for LIBs, the np-Ge electrode exhibits marvelous cycling stability with capacity retentions of 1060.0 mA h g−1 at 0.2 A g−1 and 767.1 mA h g−1 at 1 A g−1 after 100 cycles. Moreover, the electrode shows excellent rate capability with a capacity retention of 844.2 mA h g−1 at 5 A g−1. Noticeably, the (de)lithiation mechanisms of np-Ge and porous Si–Ge (p-Si6Ge4) were unveiled by operando X-ray diffraction. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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