Effect of electrolyte types on the storage behaviors of anions and cations for dual-ion batteries

被引：0
|
作者：
Zhang M. [1 ]
Yan D. [1 ]
Shen Y. [1 ]
Li W. [1 ]
机构：
[1] School of Chemical Engineering, Dalian University of Technology, Liaoning, Dalian
来源：
Huagong Xuebao/CIESC Journal | 2023年 / 74卷 / 07期
关键词：
anion intercalation; dual-ion batteries; electrochemistry; electrolytes; ethyl methyl carbonate; ethylene carbonate; reaction kinetics;
D O I：
10.11949/0438-1157.20230015
中图分类号：
学科分类号：
摘要：
Dual-ion batteries (DIBs) have attracted extensive attention due to the virtues of high working voltage, low cost and environmental friendliness. However, the high voltage characteristics of the positive electrode will cause the electrolyte to oxidize and decompose. Since the electrolyte acts as the only source of active charge carriers, the electrochemical performance is limited by long-term decomposition and gas production of the electrolyte. We herein systematically investigate the effects of electrolyte concentration and types on the PF-6 intercalation behaviors and the compatibility between solvent composition and anodes by adjusting electrolyte concentration and solvent composition. The linear ethyl methyl carbonate (EMC) solvent is more favorable for the PF-6 to insert into the graphene layers than cyclic ethylene carbonate (EC) solvent. Moreover, EC solvent is the key component for the stability of anode. The mixed electrolyte of 1 mol·L-1 LiPF6-EC/EMC (3∶7, volume ratio) with the combination of linear EMC and cyclic EC is more applicable for DIBs, and the graphite//soft carbon DIB configuration assembled by the above electrolyte can provide an energy density of 98 W·h·kg-1 at a power density of 580 W·kg-1 with a capacity retention rate of 86.9% after 1000 cycles at 1 A·g-1. © 2023 Chemical Industry Press. All rights reserved.
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页码：3116 / 3126
页数：10
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