Thiotetrelates Li
2ZnXS
4 (X = Si, Ge, and Sn) As Potential Li-Ion Solid-State Electrolytes.
ACS APPLIED MATERIALS & INTERFACES 2022;
14:9203-9211. [PMID:
35133149 DOI:
10.1021/acsami.1c24206]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
A novel inorganic solid-state electrolyte (ISSE) with high ionic conductivity is a crucial part of all-solid-state lithium-ion (Li-ion) batteries (ASSLBs). Herein, we first report on Li2ZnXS4 (LZXS, X = Si, Ge, and Sn) semiconductor-based ISSEs, crystallizing in the corner-sharing tetrahedron orthorhombic space group, to provide valuable insights into the structure, defect chemistry, phase stability, electrochemical stability, H2O/CO2 chemical stability, and Li-ion conduction mechanisms. A key feature for the Li-ion transport and low migration barrier is the interconnected and corner-shared [LiS4] units along the a-axis, which allows Li-ion transport via empty or occupied tetrahedron sites. A major finding is the first indication that Li-ion migration in Li2ZnSiS4 (LZSiS) has lower energy barriers (∼0.24 eV) compared to Li2ZnGeS4 (LZGS) and Li2ZnSnS4 (LZSnS), whether through vacancy migration or interstitial migration. However, LZGS and LZSnS exhibit greater H2O/CO2 stability compared to LZSiS. The novel framework of LZXS with relatively low Li-ion migration barriers and moderate electrochemical stability could benefit the ASSLB communities.
Collapse