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

doi:10.19799/j.cnki.2095-4239.2024.1203

Abstract

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 LiNi_0.92Co_0.04Mn_0.04O₂ (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 P₂Sₓ 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

CLC Number:

TM 911

Wenjie ZHANG, Dongsheng REN, Yu WU, Xinyu RUI, Xiang LIU, Xuning FENG, Languang LU. Thermal stability of key materials in Li₁₀GeP₁₂S₂-based all-solid-state batteries[J]. Energy Storage Science and Technology, 2025, 14(6): 2193-2199.

Figures/Tables 5

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

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