Journal
ACS ENERGY LETTERS
Volume 3, Issue 3, Pages 540-541Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b00037
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Funding
- Global Frontier R&D Programme on the Center for Hybrid Interface Materials (HIM) [2013M3A6B1078875]
- Ministry of Science, ICT & Future Planning
- Human Resources Development programme of a Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry and Energy of the Korean government [20154010200840]
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Based on the reversible conversion reactions, K2Sx (S <= x <= 6) ->(discharge) K2S3 ->(charge) K2S5, discharge charge the proposed K-S battery delivered a high discharge capacity of similar to 400 mAh g(-1) at 0.1 C -rate with stable cycle retention (94% after 20 cycles) and good rate capability up to 2 C -rate. In addition, instead of an explosive and highly reactive potassium metal electrode, a full cell consisting of an electrochemically potassium -impregnated hard carbon and the K2Sx (5 <= x <= 6) catholyte was constructed to demonstrate the feasibility of a safe K S battery system free of metallic potassium.
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