The effect of bifunctional electrolyte additive (cyanomethyl p-toluenesulfonate) on the performance of lithium cobalt oxide high-voltage lithium-ion batteries

doi:10.19799/j.cnki.2095-4239.2025.0119

Abstract

Abstract:

Lithium cobalt oxide (LCO) offers advantages such as long cycle life, high energy density, and no memory effect, making it widely used in wearable digital products. Increasing the charging cut-off voltage can effectively enhance the battery's energy density; however, it also induces adverse effects, including electrolyte oxidation and decomposition and cobalt ion dissolution, resulting in performance degradation. In this study, a bifunctional additive, cyanomethyl p-toluenesulfonate (CMPTS), was introduced to improve battery performance. CMPTS participates in the formation of the solid electrolyte interphase (SEI) on the anode and the cathode electrolyte interphase (CEI) on the cathode, suppressing further redox reactions of carbonate solvents and lithium hexafluorophosphate (LiPF₆), and preventing cobalt ion dissolution from LCO. This promotes the insertion and extraction of lithium ions (Li⁺) through the solid passivation film. Using CMPTS as an electrolyte additive in AG/LCO full cells, charge-discharge tests were conducted at 0.5 C within 3.0—4.55 V. The cell containing 1% CMPTS exhibited a capacity retention of 90.4% after 500 cycles at room temperature, compared to 80.8% for the baseline cell. At 45 ℃, after 350 cycles, the capacity retention rates of the CMPTS-containing and baseline cells were 83.2% and 78.1%, respectively. These results demonstrate that CMPTS significantly enhances the electrochemical performance of lithium-ion batteries.

Key words: lithium cobalt oxide, electrolyte additive, high voltage

CLC Number:

TM 911

Lining PAN, Haibin WANG, Xiang FANG, Pinghao SHI, Fei TAN, Junhua ZHAO. The effect of bifunctional electrolyte additive (cyanomethyl p-toluenesulfonate) on the performance of lithium cobalt oxide high-voltage lithium-ion batteries[J]. Energy Storage Science and Technology, 2025, 14(9): 3279-3289.

Figures/Tables 10

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