In Situ Polymerization of Ionic Liquid with Tunable Phase Separation for Highly Reversible and Ultralong Cycle Life Zn-Ion Battery

作者：Si Zheng, Licheng Wei, Zhaoyu Zhang, Jiageng Pan, Jiangfeng He, Liang Gao, Cheng Chao Li · 发表于：Nano Letters · 年份：2022 · DOI：10.1021/acs.nanolett.2c03421 · 被引用次数：72 · 研究领域：Advanced battery technologies research、Perovskite Materials and Applications、Advanced Battery Materials and Technologies

Severe Zn dendrite growth and side reactions greatly limit the application of aqueous zinc-ion batteries. Herein, we design a layer of polyionic liquid (PCAVImBr) film with a tunable pore size and charge density on the Zn anode to endow homogenized distribution of an electronic field, acerated Zn 2+ permeation, and inhabitation of water entry. Such an optimal combination is achieved via a polymerization induced phase separation strategy, where the enhanced cross-linking density arrests the phase separation in a shallow depth and vice versa. Furthermore, the [email protected] electrode has good plating/stripping reversibility, which retains a 99.6% CE efficiency after 3000 cycles. The symmetric cells can achieve a cycle life of more than 2400 h at different current densities. It is worth mentioning that the NVO// [email protected] full cell can still reach a 91.2% capacity retention after nearly 4000 cycles at a high current of 10 A g –1, and provides new insights for the future research of zinc-ion battery anodes.