Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 101, Issue -, Pages 68-72Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2019.02.016
Keywords
Potassium-ion batteries; Chemical dealloying; Nanoporous materials; Germanium anodes
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Funding
- National Natural Science Foundation of China [51602219]
- Tianjin Youth Thousand Talents Program
- Tianjin Municipal Science and Technology Commission [17JCYBJC42000]
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We present here for the first time the electrochemical behavior of germanium anodes in potassium-ion batteries (KIBs). Nanoporous germanium (np-Ge) samples were fabricated by the chemical-dealloying method using Al as the sacrificial metal. Galvanostatic tests identified the reversible potassiation of the np-Ge anodes and the optimal sample with tuned porosities and ligaments demonstrated stable capacities of similar to 120 mAh g(-1) over 400 cycles. Further analysis of the np-Ge electrode revealed amorphous K-Ge alloys were formed upon discharge. This study suggest germanium can be a potential anode in KIBs, but the structural tailoring is critical to overcome the kinetics problems of the large K-ions.
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