Chemistry Design Towards a Stable Sulfide-Based Superionic Conductor Li4Cu8Ge 3S12
[1];
- Center for High Pressure Science & Technology Advanced Research, Shanghai (China)
- Northern Illinois Univ., DeKalb, IL (United States)
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont IL 60439 USA
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Peking Univ., Beijing (China). State Key Lab. of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering
- Peking Univ., Beijing (China). State Key Lab. of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering; Chinese Academy of Sciences (CAS), Shanghai (China). CAS Key Lab. of Materials for Energy Conversion, Shanghai Inst. of Ceramics
Sulfide-based superionic conductors with high ionic conductivity have been explored as candidates for solid-state Li batteries. However, moisture hypersensitivity has made their manufacture complicated and costly and also impeded applications in batteries. Now, a sulfide-based superionic conductor Li4Cu8Ge 3S12 with superior stability was developed based on the hard/soft acid–base theory. The compound is stable in both moist air and aqueous LiOH aqueous solution. The electrochemical stability window was up to 1.5 V. An ionic conductivity of 0.9×10-4 S cm with low activation energy of 0.33 eV was achieved without any optimization. The material features a rigid Cu-Ge-S open framework that increases its stability. Meanwhile, the weak bonding between Li+ and the framework promotes ionic conductivity. This work provides a structural configuration in which weak Li bonding in the rigid framework promotes an environment for highly conductive and stable solid-state electrolytes.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China (NSFC); China Scholarship Council; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
- Grant/Contract Number:
- AC02-06CH11357; U1530402; Y93GJ11101
- OSTI ID:
- 1515841
- Alternate ID(s):
- OSTI ID: 1509750
- Journal Information:
- Angewandte Chemie (International Edition), Vol. 58, Issue 23; ISSN 1433-7851
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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