Li0.625Al0.125H0.25Cl0.75O0.25 Superionic Conductor with Disordered Rock-Salt Structure

被引：4

作者：

Zhang, Qian ^{[1
,2
]}

Arnold, William ^{[2
]}

Hood, Zachary D. ^{[3
]}

Li, Yang ^{[2
]}

DeWees, Rachel ^{[2
]}

Chi, Miaofang ^{[4
]}

Chen, Zhiwen ^{[1
]}

Chen, Yan ^{[5
]}

Wang, Hui ^{[2
]}

机构：

[1] Shanghai Univ, Sch Environm & Chem Engn, Shanghai 200444, Peoples R China

[2] Univ Louisville, Conn Ctr Renewable Energy Res, Mech Engn Dept, Louisville, KY 40292 USA

[3] Argonne Natl Lab, Appl Mat Div, Lemont, IL 60439 USA

[4] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, POB 2009, Oak Ridge, TN 37831 USA

[5] Oak Ridge Natl Lab, Neutron Scattering Div, POB 2009, Oak Ridge, TN 37831 USA

来源：

ACS APPLIED ENERGY MATERIALS | 2021年 / 4卷 / 08期

关键词：

solid electrolyte; rock-salt structure; disordered; ionic conductivity; Li metal; GARNET SOLID-ELECTROLYTE; IONIC-CONDUCTIVITY; LITHIUM; TRANSPORT; MECHANISMS; PATHWAYS;

D O I：

10.1021/acsaem.1c01011

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Solid-state Li-ion conductors are of broad interest in electrochemical energy storage, especially in solid-state Li batteries that serve as a promising alternative for the next-generation safe and high-energy-density batteries. Exploring solid-state superionic conductors is significant for the development of solid-state Li batteries with high performance. Herein, we report a disordered rock-salt (A(1)B(1))-structured solid electrolyte (Li0.625Al0.125H0.25)(Cl0.75O0.25) (abbr. LAHCO) that was synthesized using Li2OHCl and LiAlCl4 as precursors. Neutron diffraction reveals that Li, Al, and H atoms occupy the A sites and O and Cl atoms occupy the B sites in the A(1)B(1) structure for pure LAHCO. The LAHCO compound with excess LiAlCl4 shows the highest Li+ ionic conductivity of similar to 10(-4) S cm(-1) at room temperature due to the disordering induced by configurational entropy as well as the entropy of mixing. Moreover, LAHCO-LiAlCl4 solid electrolyte exhibits a stable polarization voltage under a current density of 5-50 mu A cm(-2) in Li symmetric cells. This work not only explicates the importance of Li-ion conductors with a rock-salt structure but also contributes toward the development of solid-state Li-ion conductors for broad applications.

引用

页码：7674 / 7680

页数：7