All-solid-state lithium-ion batteries (ASSBs) have garnered attention for their high energy density and superior safety. However, their commercialization remains challenging due to the lack of solid-state electrolytes (SSEs) with both high ionic conductivity and stable interfaces. To date, only a few SSEs have achieved ionic conductivities exceeding 10 mS/cm at room temperature.
Recently, a research team led by Prof. WU Zhongshuai and Assoc. Prof. SHI Haodong from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS) developed a high ionic conductivity sulfide-based solid electrolytes, enhancing the performance of ASSBs. The study was published in ACS Energy Letters .
Researchers developed the novel electrolyte, Li 20/3 (GeSiSb) 1/3 S 5 I (LGSSSI), by employing a multi-cation (Ge, Si, Sb) doping and substitution strategy. The electrolyte exhibited exceptional ionic conductivity, attributed to its low lithium-ion migration activation energy (0.17 eV). After cold pressing, LGSSSI achieved an ionic conductivity of 12.7 mS/cm, which further increased to 32.2 mS/cm after hot pressing.
Integrated with LGSSSI, ASSBs achieved high cycling stability under ultra-high cathode mass loading (100 mg/cm 2 ) and across a wide temperature range (-20°C to 60°C). In addition, LGSSSI demonstrated excellent interfacial compatibility with various cathode and anode materials, including LiNi 0.8 Mn 0.1 Co 0.1 O 2 , LiCoO 2 cathodes, lithium-indium alloy, and silicon-carbon composite anodes.
"Our study lays a foundation for achieving ASSBs with wide temperature adaptability, high cathode loading, and long cycle life," said Prof. WU.
ACS Energy Letters
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A Superionic Conductor Lithium Argyrodite Sulfide of Li7–x(GeSi)(1–x)/2SbxS5I toward All-Solid-State Lithium-Ion Batteries
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