期刊
CHEMISTRY OF MATERIALS
卷 34, 期 20, 页码 9159-9171出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.2c02106
关键词
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资金
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [NRF-2020M3H4A1A03082971, NRF2018R1A5A1024127, NRF-2022M3H4A6A01037200]
- Technology Development Program to Solve Climate Changes through NRF - Ministry of Science and ICT [NRF-2021M1A2A2038132]
- Ministry of Trade, Industry & Energy (MOTIE, Korea) [20012324]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20012324] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The thermal stability of LPSCl with Ni-rich layered oxide cathode materials is poor, which can lead to thermal runaway. Combining LPSCl with LiFePO4 improves the thermal stability. In addition, despite its poor electrochemical activity for ASSBs, LiFePO4 shows excellent electrochemical performance.
All-solid-state batteries (ASSBs) have received much attention because of their high energy density and safety. However, the safety of argyrodite-type Li6PS5Cl (LPSCl)-based ASSBs is still not assured because their thermal stability has been assessed under selected mild conditions. Herein, we introduce the poor thermal stability of LPSCl with Ni-rich layered oxide cathode materials as the trigger of thermal runaway. The charged composite cathode pellets containing Li1-xNi0.8Co0.1Mn0.1O2 and LPSCl are explosively burned at 150 degrees C even in Ar. Moreover, the mechanical abuse gives rise to violent burning at room temperature. This is due to vigorous exothermic chemical reactions between delithiated Li1-xNi0.8Co0.1Mn0.1O2 and LPSCl. However, LPSCl with LiFePO4 exhibits excellent thermal stability, such as no violent exothermic reactions even at 350 degrees C. This is because LPSCl is metastable with delithiated Li1-xFePO4. Moreover, LiFePO4 shows excellent electrochemical performance, such as a high reversible capacity of 141 mAh g-1 and stable capacity retention over 1000 cycles, despite the fact that LiFePO4 is known to be poorly electrochemically active for ASSBs. These findings provide fundamental insights to improve the thermal stability and electrochemical performance of LPSCl-based ASSBs.
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