Effect of Microstructure on the Cycling Behavior of Li-In Alloy Anodes for Solid-State Batteries
Effect of Microstructure on the Cycling Behavior of Li-In Alloy Anodes for Solid-State Batteries
复制标题
DOI：
10.1021/acsenergylett.3c02274
复制
发表时间：
2024-01-26
影响因子：
22
通讯作者：
Pasta，Mauro
中科院分区：
文献类型：
--
作者：
Aspinall，Jack;Chart，Yvonne;Pasta，Mauro
在铟金属和InLi金属间化合物的两相区域中操作的铟锂合金是双电极固态电池中的选择的对电极和参考电极。在充电和放电的高电流密度下，它们提供低极化、良好的可访问容量和良好的循环寿命。通过合成纯相InLi金属间化合物并测量其扩散和机械性能，很明显，电化学性能归因于InLi金属间化合物中测量的快速扩散动力学，DLi 298 K = 5.5 × 10- 7 cm 2s-1。铟金属相基本上是离子阻挡的，因此性能与微结构有关，微结构随着循环而演变。一个简单的两层微结构的基础上建立的基本理解，最大限度地提高性能。尽管铟基合金在商业应用中存在局限性，但所吸取的经验教训可以推广到其他快速导电的锂金属间化合物。
Indium–lithium alloys operating in the two-phase region of indium metal and the InLi intermetallic are the counter and reference electrodes of choice in two-electrode solid-state batteries. At high current densities on both charge and discharge, they offer low polarization, good accessible capacity, and good cycle life. By synthesizing a phase pure InLi intermetallic and measuring its diffusion and mechanical properties, it is clear that the electrochemical performance is attributable to measured fast diffusion kinetics in the InLi intermetallic,DLi298K= 5.5 × 10–7cm2s–1. The indium metal phase is essentially ion-blocking, so the performance is tied to the microstructure, which evolves with cycling. A simple two-layer microstructure is proposed, based on the fundamental understanding established, which maximizes performance. Despite the limitations of indium-based alloys in commercial applications, the lessons learned can be extended to other fast-conducting lithium intermetallics.