Achieving long cycle life for all-solid-state rechargeable Li-I2 battery by a confined dissolution strategy

Zhu Cheng, Hui Pan, Fan Li, Chun Duan, Hang Liu, Hanyun Zhong, Chuanchao Sheng, Guangjin Hou, Ping He () and Haoshen Zhou ()
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Zhu Cheng: Nanjing University
Hui Pan: Nanjing University
Fan Li: Dalian National Lab for Clean Energy, State Key Laboratory of Catalysis, Dalian Institute of Chemical physics, Chinese Academy of Sciences
Chun Duan: Nanjing University
Hang Liu: Nanjing University
Hanyun Zhong: Nanjing University
Chuanchao Sheng: Nanjing University
Guangjin Hou: Dalian National Lab for Clean Energy, State Key Laboratory of Catalysis, Dalian Institute of Chemical physics, Chinese Academy of Sciences
Ping He: Nanjing University
Haoshen Zhou: Nanjing University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Rechargeable Li-I2 battery has attracted considerable attentions due to its high theoretical capacity, low cost and environment-friendliness. Dissolution of polyiodides are required to facilitate the electrochemical redox reaction of the I2 cathode, which would lead to a harmful shuttle effect. All-solid-state Li-I2 battery totally avoids the polyiodides shuttle in a liquid system. However, the insoluble discharge product at the conventional solid interface results in a sluggish electrochemical reaction and poor rechargeability. In this work, by adopting a well-designed hybrid electrolyte composed of a dispersion layer and a blocking layer, we successfully promote a new polyiodides chemistry and localize the polyiodides dissolution within a limited space near the cathode. Owing to this confined dissolution strategy, a rechargeable and highly reversible all-solid-state Li-I2 battery is demonstrated and shows a long-term life of over 9000 cycles at 1C with a capacity retention of 84.1%.

Date: 2022
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DOI: 10.1038/s41467-021-27728-0

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