Studies on the swelling force during cycling of Si-based anodes in lithium ion batteries

doi:10.19799/j.cnki.2095-4239.2022.0194

Abstract

Abstract:

Studying the swelling force of Si-based anodes for the next generation of high energy lithium-ion batteries is crucial. In this study, we assembled 60-Ah large pouch batteries with commercialized SiO _x /Graphite and NCM811 cathode, tested their cycle life and swelling force increase, and studied the relevant mechanisms and strategies for reducing the swelling force. The structure of SiO _x was a 3～5 nm Si core distributed in amorphous SiO₂, and the specific capacity of SiO _x in the first cycle was 1380 mAh/g and the first columbic efficiency was ca. 75%. The swelling force increase during the first cycle was 7320 N, which was 4 times higher than that of graphite-based batteries. The cycling tests under different ambient temperatures showed high temperature-dependent tendency. At 25 ℃, 45 ℃, and 60 ℃, the cycle numbers were 980, 850, and 500, corresponding to 70% SOH, with the maximum swelling force being 25107, 25490, and 23667 N, respectively. The root cause for the swelling force increase was the solid electrolyte interface growth and thickening with repeated electrochemical cycles. The compression curve was applied to sorting appropriate cushion that can accommodate the swelling force. The results showed that polyurethane cushion had the best compression properties, reducing the swelling force by 50%. This study provides a foundation for using SiO _x in large-scale lithium-ion batteries.

Key words: lithium-ion batteries, SiO _x /graphite anode, swelling force, polyurethane cushion

CLC Number:

TM 912

Shaojun NIU, Kai WU, Guobin ZHU, Yan WANG, Qunting QU, Honghe ZHENG. Studies on the swelling force during cycling of Si-based anodes in lithium ion batteries[J]. Energy Storage Science and Technology, 2022, 11(9): 2989-2994.

Figures/Tables 9

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