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

作者：Zhu Cheng, Hui Pan, Fan Li, Chun Ying Duan, Hang Liu, Hanyun Zhong, Chuanchao Sheng, Guangjin Hou, Ping He, Haoshen Zhou · 发表于：Nature Communications · 年份：2022 · DOI：10.1038/s41467-021-27728-0 · 被引用次数：110 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced battery technologies research

Abstract Rechargeable Li-I 2 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 I 2 cathode, which would lead to a harmful shuttle effect. All-solid-state Li-I 2 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-I 2 battery is demonstrated and shows a long-term life of over 9000 cycles at 1C with a capacity retention of 84.1%.