Cycle performance characteristics of soft pack lithium-ion batteries under vacuum environment

doi:10.19799/j.cnki.2095-4239.2021.0562

Abstract

Abstract:

To investigate the cycle safety performance of batteries under low-pressure conditions, such as those found on the space station, aircrafts were used. The pouch batteries Li(NiCoMn)O₂ were cycled at 0.5 ℃ at a pressure of 0 kPa in a low-pressure cabin. After the experiment, the cycle characteristics changed greatly compared with the standard pressure environment. With the increase in cycles, severe large-scale areas of unrecoverable deformation occurred on the batteries, and the thickness increased. Furthermore, the capacity decreased rapidly, and it was >80% after 10 cycles. However, when the pressure is increased from 0 kPa to 95 kPa, a small portion of the cycle capacity is recovered. Under vacuum pressure, the processes of expansion and contraction within the battery during charging and discharging are accelerated. It hastens capacity attenuation and causes false loss of some capacity due to massive internal and external pressures. Besides, the battery periodic heating and cooling accelerates, and the temperature inhomogeneity deteriorates within the cycle. Therefore, the maximum temperature difference between the charge and the discharge is 12.9 ℃. Obviously, the battery's thermal stability and safety deteriorate, whereas the potential thermal hazard during charging and discharging increases under low-pressure conditions. Capacity differential analysis demonstrates that the loss of active lithium and the destruction of the electrode material structure are essential factors that decrease the cyclic charging and discharging performance of the battery in a low-pressure vacuum environment.

Key words: soft pack lithium-ion battery, vacuum pressure condition, cycle safety performance, irreversible deformation, capacity attenuation, thermal stability

CLC Number:

TM 912

LIU Hangxin, CHEN Xiantao, SUN Qiang, ZHAO Chenxi. Cycle performance characteristics of soft pack lithium-ion batteries under vacuum environment[J]. Energy Storage Science and Technology, 2022, 11(6): 1806-1815.

Figures/Tables 11

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电池编号	舱内循环次数	舱外循环次数	恢复率/%
1	30	7	16.32
2	35	5	14.92
3	42	5	9.95
4	33	6	13.15

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