A dicarbonate solvent electrolyte for high performance 5 V-Class Lithium-based batteries

A dicarbonate solvent electrolyte for high performance 5 V-Class Lithium-based batteries

15 January 2024 | Xiaozhe Zhang, Pan Xu, Jianing Duan, Xiaodong Lin, Juanjuan Sun, Wenjie Shi, Hewei Xu, Wenjie Dou, Qingyi Zheng, Ruming Yuan, Jiande Wang, Yan Zhang, Shanshan Yu, Zehan Chen, Mingsen Zheng, Jean-François Gohy, Quanfeng Dong & Alexandru Vlad
This article reports the development of a new dicarbonate-based electrolyte for 5 V-class lithium-based batteries, which uses dimethyl 2,5-dioxahexanedioate (DMDOHD) as the solvent. The DMDOHD-based electrolyte exhibits superior anodic stability up to 5.2 V (vs. Li/Li+) and enables stable, dendrite-free lithium plating and stripping. The electrolyte also shows high lithium plating/stripping coulombic efficiency (CE) of 92% without additives or co-solvents, and excellent cycling stability with a capacity retention of >97% after 250 cycles in Li | LiNi0.5Mn0.5O4 cells. The improved performance is attributed to the formation of a robust solid-electrolyte interphase (SEI) with homogeneous inorganic-organic mixed components and a dense cathode-electrolyte interphase (CEI). The addition of fluoroethylene carbonate (FEC) further enhances the lithium plating/stripping CE and capacity retention. The study demonstrates the potential of dicarbonate solvents, particularly DMDOHD, for high-voltage lithium-based batteries, offering a promising approach to achieve higher energy density and improved safety.This article reports the development of a new dicarbonate-based electrolyte for 5 V-class lithium-based batteries, which uses dimethyl 2,5-dioxahexanedioate (DMDOHD) as the solvent. The DMDOHD-based electrolyte exhibits superior anodic stability up to 5.2 V (vs. Li/Li+) and enables stable, dendrite-free lithium plating and stripping. The electrolyte also shows high lithium plating/stripping coulombic efficiency (CE) of 92% without additives or co-solvents, and excellent cycling stability with a capacity retention of >97% after 250 cycles in Li | LiNi0.5Mn0.5O4 cells. The improved performance is attributed to the formation of a robust solid-electrolyte interphase (SEI) with homogeneous inorganic-organic mixed components and a dense cathode-electrolyte interphase (CEI). The addition of fluoroethylene carbonate (FEC) further enhances the lithium plating/stripping CE and capacity retention. The study demonstrates the potential of dicarbonate solvents, particularly DMDOHD, for high-voltage lithium-based batteries, offering a promising approach to achieve higher energy density and improved safety.
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