Study on thermal runaway of hybrid solid-liquid batteries

doi:10.19799/j.cnki.2095-4239.2023.0846

Abstract

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:

TM 911

Xin JIN, Jianru ZHANG, Qiyu WANG, Rui ZHANG, Bitong WANG, Zhongyang ZHANG, Hailong YU, Xiqian YU, Hong LI. Study on thermal runaway of hybrid solid-liquid batteries[J]. Energy Storage Science and Technology, 2024, 13(1): 48-56.

Figures/Tables 8

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工况(SOC)	T₀/℃	T_c/℃	T_max/℃	(dT/dt)_max/(℃/min)
0%	176.2	232.1	276.1	156
25%	172.4	183.5	498.4	1716
50%	170.7	177.1	552.1	2136
75%	166.2	167.8	624.4	3240
100%	160.5	165.0	720.7	4722

工况(SOH)	T₀/℃	T_c/℃	T_max/℃	(dT/dt)_max/(℃/min)
100%SOH	176.2	232.1	276.1	156
90%SOH	169.4	223.9	309.5	150.9
80%SOH	177.2	224.2	329.0	161.1
70%SOH	177.4	222.7	366.3	147.3

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