Energy Storage Science and Technology ›› 2025, Vol. 14 ›› Issue (6): 2193-2199.doi: 10.19799/j.cnki.2095-4239.2024.1203

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Thermal stability of key materials in Li10GeP12S2-based all-solid-state batteries

Wenjie ZHANG1(), Dongsheng REN2, Yu WU1(), Xinyu RUI2(), Xiang LIU3(), Xuning FENG2(), Languang LU2()   

  1. 1.School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
    2.School of Vehicle and Mobility, Tsinghua University, Beijing 100084, China
    3.School of Materials Science and Engineering, Beihang University, Beijing 100191, China
  • Received:2024-12-18 Revised:2024-12-31 Online:2025-06-28 Published:2025-06-27
  • Contact: Yu WU, Xinyu RUI, Xiang LIU, Xuning FENG, Languang LU E-mail:792442831@qq.com;wuyu@bit.edu.cn;rxy19@tsinghua.org.cn;xiangliu@buaa.edu.cn;fxn17@mail.tsinghua.edu.cn;lulg@mail.tsinghua.edu.cn

Abstract:

All-solid-state lithium batteries (ASSLBs) are promising candidates for next-generation energy storage systems because of their wide operating temperature range, high energy density, and high power density. The sulfide solid electrolyte Li10GeP12S2 (LGPS) has attracted significant attention for its exceptionally high lithium-ion conductivity (1×10-3 S/cm). However, the thermal stability of key materials in LGPS-based ASSLBs under high energy density configurations has not been reported. This study examines the thermal runaway mechanisms of LGPS solid electrolytes combined with a LiNi0.92Co0.04Mn0.04O2 (NCM92) cathode and silicon-carbon anode. Differential scanning calorimetry and simultaneous thermal analysis-mass spectrometry were employed to analyze heat generation and gas evolution in solid electrolytes, electrodes, and their mixtures. Following thermal analysis, scanning electron microscopy combined with energy-dispersive spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were used to characterize the reaction products at different temperatures. At 200 ℃, the NCM92 cathode undergoes a phase transition, releasing a significant amount of oxygen that reacts mildly with the sulfide electrolyte to form P2S and trace SO2. At 310 ℃, the LGPS and the cathode mixture exhibited exothermic reactions, producing metal oxides, sulfides, and phosphates. This study elucidates the thermal stability of key materials in NCM92|LGPS|SiC ASSLBs, providing theoretical guidance for material selection and safety-oriented design optimization.

Key words: all-solid-state lithium batteries, Li10GeP12S2, high energy density, thermal stability

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