Energy Storage Science and Technology ›› 2024, Vol. 13 ›› Issue (1): 48-56.doi: 10.19799/j.cnki.2095-4239.2023.0846

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Study on thermal runaway of hybrid solid-liquid batteries

Xin JIN(), Jianru ZHANG, Qiyu WANG(), Rui ZHANG, Bitong WANG, Zhongyang ZHANG, Hailong YU, Xiqian YU, Hong LI   

  1. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2023-11-21 Revised:2023-12-07 Online:2024-01-05 Published:2024-01-22
  • Contact: Qiyu WANG E-mail:JINXIN20140408@163.com;qywang10@iphy.ac.cn

Abstract:

Hybrid solid-liquid electrolyte Li-ion batteries are energy storage devices with high energy density and high safety, which can realize industrialization in a short time. In this study, a hybrid solid-liquid electrolyte (LATP and electrolyte) battery with a high specific capacity active material (positive electrode NCM811 and negative electrode C@SiO) was investigated. An accelerating rate calorimeter and gas chromatograph were used to simulate thermal runaway and analyze gas production components of battery samples under full SOCs during the cycle life. Changes in the electrolyte content were detected using ultrasonic technology. The results show that the thermal safety of fresh batteries decreases as the charge state increases, and the proportion of combustible gas increases as the gas production increases. As the capacity decreases, thermal runaway parameters, such as the thermal runaway starting temperature, maximum heat yield rate, and gas production, decrease. The safety performance is enhanced when the capacity retention rate is 70%, which is speculated to be related to the conversion of the electrolyte into a solid electrolyte. This study preliminarily investigates the thermal runaway phenomenon of the battery in this system and provides support for the internal mechanism analysis and battery design.

Key words: lithium-ion battery, hybrid solid-liquid, thermal runaway, whole cycle life

CLC Number: