RESEARCH ON LOW-COST FLUORINE-FREE AQUEOUS MIXED SOLVENT LITHIUM ACETATE ELECTROLYTES

Wu Fan; Jiang Wenquan; Luo Man; Wu Yuanfang; Zhang Yongqiang; He Wenxiu

doi:10.19912/j.0254-0096.tynxb.2022-0560

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (8) : 17-22. DOI: 10.19912/j.0254-0096.tynxb.2022-0560

RESEARCH ON LOW-COST FLUORINE-FREE AQUEOUS MIXED SOLVENT LITHIUM ACETATE ELECTROLYTES

Wu Fan^1~3, Jiang Wenquan^1~4, Luo Man^1,3,4, Wu Yuanfang^1~4, Zhang Yongqiang⁵, He Wenxiu⁵

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Abstract

Using 1,5-pentanediol （PD） and polyethylene glycol （PEG） as co-solvent to improve the electrochemical performance of 13 m （m=[mol salt]/[kg solvent]） LiOAc as aqueous lithium-ion batteries electrolytes obtains low-cost fluorine-free aqueous mixed solvent lithium acetate electrolytes. The activity of water molecules in the electrolyte was characterized by infrared absorption and Roman scattering spectroscopy. The results show that in the mixed solvent electrolytes the activity of water molecules is inhibited. Electrochemical tests show that the electrolytes have the widest electrochemical stability window of 3.10 V when the electrolyte composition is 2 m LiOAc-PD_0.5PEG_0.5, which makes the negative electrode Li₄Ti₅O₁₂ reversibly charge and discharge. Li₄Ti₅O₁₂//LiMn₂O₄ full cell with 2 m LiOAc-PD_0.5PEG_0.5 tests show an initial platform voltage of 2.3 V and specific energy of 0.0616 kWh/kg, which obtains higher capacity and cycle stability than 13 m LiOAc electrolytes.

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lithium-ion batteries / electrolyte / energy storage / solvation

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Wu Fan, Jiang Wenquan, Luo Man, Wu Yuanfang, Zhang Yongqiang, He Wenxiu. RESEARCH ON LOW-COST FLUORINE-FREE AQUEOUS MIXED SOLVENT LITHIUM ACETATE ELECTROLYTES[J]. Acta Energiae Solaris Sinica. 2023, 44(8): 17-22 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0560

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