晶界
电导率
快离子导体
离子电导率
电解质
扩散
化学物理
材料科学
活化能
放松(心理学)
离子键合
化学
分析化学(期刊)
热力学
离子
结晶学
物理化学
微观结构
物理
电极
社会心理学
色谱法
心理学
有机化学
作者
Swapna Ganapathy,Chuang Yu,Ernst R. H. van Eck,Marnix Wagemaker
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2019-04-15
卷期号:4 (5): 1092-1097
被引量:45
标识
DOI:10.1021/acsenergylett.9b00610
摘要
The development of high-performance all-solid-state batteries relies on charge transport in solid electrolytes, where transport across grain boundaries often limits their bulk conductivity. The argyrodite Li6PS5X (X = Cl, Br) solid electrolyte has a high conductivity; however, macroscopic diffusion in this material involves complex jump processes, which leads to an underestimation of the activation energy. Using a comprehensive frequency- and temperature-dependent analysis of the spin–lattice relaxation rates, a complete estimation of Li self-diffusion is demonstrated. Another experimental challenge is quantifying the impact of grain boundaries on the total bulk conductivity. Li6PS5Cl and Li6PS5Br have identical crystalline structures, but with 6Li MAS NMR, their resonance peaks have different chemical shifts. Exploiting this with two-dimensional 6Li–6Li exchange NMR on a mixture of Li6PS5Br and Li6PS5Cl, we observe Li exchange between particles of these two materials across grain boundaries, allowing direct and unambiguous quantification of this often limiting process in solid-state electrolytes.
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