Analysis and improvement of interval cycle life for high voltage lithium ion batteries

doi:10.19799/j.cnki.2095-4239.2019.0257

Abstract

Abstract:

This study analyzes the causes of failure of the interval cycle of a high-voltage system. To this end, it compares the relationships among the interval cycle, high-temperature cycle, and storage performance at 45 ℃. During the high-temperature interval cycle, the cathode material structure is destroyed and the metal element dissolves, releasing O₂ that oxidizes and decomposes the electrolyte. The cathode electrolyte interphase and solid electrolyte interface films in the high-temperature and high-voltage state are recombined and repaired, which increases the impedance and accelerates the cycle capacity attenuation. The cell interval cycle life at high temperatures can be obviously increased by improving the structural stability of the cathode material and the cathodeanode interface.

Key words: lithium ion battery, high voltage, interval cycle, high temperature, gassing

CLC Number:

TM 911

KONG Lingli, ZHANG Kejun, CAI Jiaxing, LI Fuxuan. Analysis and improvement of interval cycle life for high voltage lithium ion batteries[J]. Energy Storage Science and Technology, 2020, 9(3): 964-968.

Figures/Tables 10

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Table 1

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References 7

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正极材料	LCO-A	LCO-B
D10/μm	3.34	7.20
D50/μm	15.19	16.34
D90/μm	37.96	30.24
SSA/m²·g	0.25	0.14
Ti/ppm	1170	947
Mg/ppm	1918	1256
Al/ppm	960	3178

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