哈尔滨工业大学黄燕团队定制了具有质子保持器特征的水锌金属电池聚合物-无机双层SEI。相关研究成果发表在2025年1月15日出版的国际学术期刊《德国应用化学》。

水性锌离子电池中的传统SEI主要作为物理屏障来防止HER，HER在高电流密度下容易因锌沉积不均匀而导致结构劣化。

该文中，研究人员提出了一种通过苯胺调制电解质对具有质子保持器特征的聚合物无机双层SEI进行原位结构设计。具有高刚度和强度的内部ZnF₂有效地抑制了Zn枝晶。外层PANI调节电流分布，延迟树突生长的时间。PANI中的=N-能够可逆地保持质子，从而抑制HER。

通过这种双层SEI，锌阳极在40mA cm^-2和40mAh cm^-2下实现了令人印象深刻的126小时循环寿命（DOD=70.8%），解决了单层无机SEI在这些条件下无法循环的瓶颈。具有双层SEI的Zn||NaVO袋式电池具有1.2Ah的高容量和350h的循环寿命，容量保持率为78%。在-30°C下，电池的容量为335毫安时，循环寿命为507小时，容量保持率为72%。

研究结果为具有量身定制的结构和功能的SEI设计提供了深刻的见解，为下一代先进电池铺平了道路。

附：英文原文

Title: Tailored Polymer-Inorganic Bilayer SEI with Proton Holder Feature for Aqueous Zn Metal Batteries

Author: Mangwei Cui, Lidong Yu, Jin Hu, Sisi He, Chunyi Zhi, Yan Huang

Issue&Volume: 2025-01-15

Abstract: Conventional SEI in aqueous Zn-ion batteries mainly acts as a physical barrier to prevent HER, which is prone to structural deterioration stemming from uneven Zn deposition at high current densities. Herein, we propose an in-situ structural design of polymer-inorganic bilayer SEI with a proton holder feature by aniline-modulated electrolytes. The inner ZnF2 with high stiffness and strength effectively suppresses Zn dendrites. And the outer PANI regulates the current distribution and delays the Sand's time of dendrites growth. The =N- in PANI is capable of reversible proton holder, thereby inhibiting HER. With this bilayer SEI, the Zn anode achieves an impressive cycle life of 126 h under 40 mA cm-2 & 40 mAh cm-2 (DOD=70.8%), solving the bottleneck of single-layer inorganic SEI that could not be cycled under these conditions. The Zn||NaVO pouch battery with bilayer SEI exhibits a high capacity of 1.2 Ah and a cycle life of 350 h with 78% capacity retention. At -30°C, the battery delivers a capacity of 335 mAh and a cycle life of 507 h with 72% capacity retention. Our findings offer profound insights into the design of SEI with tailored structure and functionality, paving the way for the next generation of advanced batteries.

DOI: 10.1002/anie.202423531

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202423531