美国马里兰大学Chunsheng Wang团队报道了溶剂化鞘层重组使二价金属电池具有快速的界面电荷传输动力学。相关研究成果于2021年10月8日发表于国际顶尖学术期刊《科学》。

可充电镁钙金属电池(RMBs和RCBs)由于镁和钙的高地壳丰度和容量而成为锂离子电池的有前途的替代品。然而，它们受到缓慢的动力学和寄生反应的困扰。

研究人员发现了一系列甲氧基乙胺螯合剂，通过溶剂化鞘层重组极大地促进了界面电荷传输动力学，并抑制了阴极和金属阳极上的副反应，从而使RMB和RCB全电池实现稳定且高度可逆的循环，能量密度分别为412和471w h/kg。

该工作为二价金属电池提供了一种通用的电解液设计策略。

附：英文原文

Title: Solvation sheath reorganization enables divalent metal batteries with fast interfacial charge transfer kinetics

Author: Singyuk Hou, Xiao Ji, Karen Gaskell, Peng-fei Wang, Luning Wang, Jijian Xu, Ruimin Sun, Oleg Borodin, Chunsheng Wang

Issue&Volume: 2021-10-08

Abstract: Rechargeable magnesium and calcium metal batteries (RMBs and RCBs) are promising alternatives to lithium-ion batteries because of the high crustal abundance and capacity of magnesium and calcium. Yet, they are plagued by sluggish kinetics and parasitic reactions. We found a family of methoxyethyl-amine chelants that greatly promote interfacial charge transfer kinetics and suppress side reactions on both the cathode and metal anode through solvation sheath reorganization, thus enabling stable and highly reversible cycling of the RMB and RCB full cells with energy densities of 412 and 471 watt-hours per kilogram, respectively. This work provides a versatile electrolyte design strategy for divalent metal batteries.

DOI: abg3954

Source: https://www.science.org/doi/10.1126/science.abg3954