Atomic-scale combination of germanium-zinc nanofibers for structural and electrochemical evolution

Gyujin Song, Jun Young Cheong, Chanhoon Kim, Langli Luo, Chihyun Hwang, Sungho Choi, Jaegeon Ryu, Sungho Kim, Woo-Jin Song, Hyun-Kon Song, Chongmin Wang (), Il-Doo Kim () and Soojin Park ()
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Gyujin Song: Ulsan National Institute of Science and Technology (UNIST)
Jun Young Cheong: Korea Advanced Institute of Science and Technology
Chanhoon Kim: Korea Institute of Industrial Technology
Langli Luo: Pacific Northwest National Laboratory
Chihyun Hwang: Ulsan National Institute of Science and Technology (UNIST)
Sungho Choi: Pohang University of Science and Technology (POSTECH)
Jaegeon Ryu: Pohang University of Science and Technology (POSTECH)
Sungho Kim: Ulsan National Institute of Science and Technology (UNIST)
Woo-Jin Song: Pohang University of Science and Technology (POSTECH)
Hyun-Kon Song: Ulsan National Institute of Science and Technology (UNIST)
Chongmin Wang: Pacific Northwest National Laboratory
Il-Doo Kim: Korea Advanced Institute of Science and Technology
Soojin Park: Pohang University of Science and Technology (POSTECH)

Nature Communications, 2019, vol. 10, issue 1, 1-11

Abstract: Abstract 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 ~ 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.

Date: 2019
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DOI: 10.1038/s41467-019-10305-x

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