化学
卤化物
快离子导体
电化学
电化学窗口
离子电导率
电解质
固溶体
共晶体系
离子键合
无机化学
离子
锂(药物)
结晶学
分析化学(期刊)
物理化学
电极
微观结构
医学
有机化学
内分泌学
色谱法
作者
Jianwen Liang,Xiaona Li,Shuo Wang,Keegan R. Adair,Weihan Li,Yang Zhao,Changhong Wang,Yongfeng Hu,Li Zhang,Shangqian Zhao,Shigang Lu,Huan Huang,Ruying Li,Yifei Mo,Xueliang Sun
摘要
The enabling of high energy density of all-solid-state lithium batteries (ASSLBs) requires the development of highly Li+-conductive solid-state electrolytes (SSEs) with good chemical and electrochemical stability. Recently, halide SSEs based on different material design principles have opened new opportunities for ASSLBs. Here, we discovered a series of LixScCl3+x SSEs (x = 2.5, 3, 3.5, and 4) based on the cubic close-packed anion sublattice with room-temperature ionic conductivities up to 3 × 10–3 S cm–1. Owing to the low eutectic temperature between LiCl and ScCl3, LixScCl3+x SSEs can be synthesized by a simple co-melting strategy. Preferred orientation is observed for all the samples. The influence of the value of x in LixScCl3+x on the structure and Li+ diffusivity were systematically explored. With increasing x value, higher Li+, lower vacancy concentration, and less blocking effects from Sc ions are achieved, enabling the ability to tune the Li+ migration. The electrochemical performance shows that Li3ScCl6 possesses a wide electrochemical window of 0.9–4.3 V vs Li+/Li, stable electrochemical plating/stripping of Li for over 2500 h, as well as good compatibility with LiCoO2. LiCoO2/Li3ScCl6/In ASSLB exhibits a reversible capacity of 104.5 mAh g–1 with good cycle life retention for 160 cycles. The observed changes in the ionic conductivity and tuning of the site occupations provide an additional approach toward the design of better SSEs.
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