Atomic-scale combination of germanium-zinc nanofibers for structural and electrochemical evolution
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- Atomic-scale combination of germanium-zinc nanofibers for structural and electrochemical evolution
- Song, Gyujin; Cheong, Jun Young; Kim, Chanhoon; Luo, Langli; Hwang, Chihyun; Choi, Sungho; Ryu, Jaegeon; Kim, Sungho; Song, Woo-Jin; Song, Hyun-Kon; Wang, Chongmin; Kim, Il-Doo; Park, Soojin
- Issue Date
- NATURE PUBLISHING GROUP
- NATURE COMMUNICATIONS, v.10, pp.2364
- Alloys are recently receiving considerable attention in the community of rechargeable batteries as possible alternatives to carbonaceous negative electrodes; however, challenges remain for the practical utilization of these materials. Herein, we report the synthesis of germanium-zinc alloy nanofibers through electrospinning and a subsequent calcination step. Evidenced by in situ transmission electron microscopy and electrochemical impedance spectroscopy characterizations, this one-dimensional design possesses unique structures. Both germanium and zinc atoms are homogenously distributed allowing for outstanding electronic conductivity and high available capacity for lithium storage. The as-prepared materials present high rate capability (capacity of similar to 50% at 20 C compared to that at 0.2 C-rate) and cycle retention (73% at 3.0 C-rate) with a retaining capacity of 546 mAh g(-1) even after 1000 cycles. When assembled in a full cell, high energy density can be maintained during 400 cycles, which indicates that the current material has the potential to be used in a large-scale energy storage system.
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