Cheng Zhu, Pan Hui, Li Fan, Duan Chun, Liu Hang, Zhong Hanyun, Sheng Chuanchao, Hou Guangjin, He Ping, Zhou Haoshen
Center of Energy Storage Materials & Technology, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China.
Dalian National Lab for Clean Energy, State Key Laboratory of Catalysis, Dalian Institute of Chemical physics, Chinese Academy of Sciences, Dalian, 116023, P. R. China.
Nat Commun. 2022 Jan 10;13(1):125. doi: 10.1038/s41467-021-27728-0.
Rechargeable Li-I 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 cathode, which would lead to a harmful shuttle effect. All-solid-state Li-I 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 battery is demonstrated and shows a long-term life of over 9000 cycles at 1C with a capacity retention of 84.1%.
可充电锂碘电池因其高理论容量、低成本和环境友好性而备受关注。碘阴极的电化学氧化还原反应需要多碘化物溶解，这会导致有害的穿梭效应。全固态锂碘电池完全避免了液体体系中的多碘化物穿梭。然而，传统固体界面处不溶性放电产物会导致电化学反应迟缓且充电性能差。在这项工作中，通过采用由分散层和阻挡层组成的精心设计的混合电解质，我们成功地促进了一种新的多碘化物化学过程，并将多碘化物溶解局限在阴极附近的有限空间内。由于这种受限溶解策略，展示了一种可充电且高度可逆的全固态锂碘电池，在1C下循环寿命超过9000次，容量保持率为84.1%。
