首页|乙腈-水系混合电解液对Zn-Na3V2(PO4)3电池电化学稳定性的影响

乙腈-水系混合电解液对Zn-Na3V2(PO4)3电池电化学稳定性的影响

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Na3V2(PO4)3正极材料具有稳定的三维框架结构、较高的工作电压和相对成熟的制备工艺,近年来也逐渐用于水系锌离子电池中.然而,二价Zn2+的脱嵌和活泼的水系反应环境会加速磷酸盐晶格的破坏.本文在Zn-Na3V2(PO4)3电池体系的水系电解液中加入适量的乙腈(AN),研究电解液中AN与水的比例对离子溶剂化结构和电化学行为的影响规律,并通过非原位XRD探究Na3V2(PO4)3晶体结构的演变.结果表明:过少的AN会加快正极材料晶格框架的破坏,而过多的AN会减缓电极反应动力学;在含有适量AN的电解液中,Zn-Na3V2(PO4)3电池不但在50 mA/g的电流密度下具有91.4 mA∙h/g的较高比容量,同时在500 mA/g的电流密度下可以稳定循环1000次且无明显容量衰退.
Effect of acetonitrile-water hybrid electrolyte on electrochemical stability of Zn-Na3V2(PO4)3 batteries
Among various cathode materials,the Na3V2(PO4)3,with stable framework,high operating voltage and relatively mature manufacturing,has been applied gradually in aqueous zinc-ion batteries in recent years.However,the(de)intercalation of divalent Zn2+and the overly active aqueous reaction environment will accelerate the destruction of phosphate lattice.This work introduced the addition of an appropriate amount of acetonitrile(AN)to the aqueous electrolyte of the Zn-Na3V2(PO4)3 battery system,investigated the influence of the ratio of AN to water on the ion solvation structure and electrochemical behavior,and explored the evolution of the crystal structure of Na3V2(PO4)3 according by ex-situ XRD.The results indicate that too little AN will accelerate the damage of the cathode lattice framework,while too much AN will slow down the electrode reaction kinetics.In the electrolyte containing an appropriate amount of AN,the Zn-Na3V2(PO4)3 batteries exhibit the high specific capacity of 91.4 mA∙h/g at 50 mA/g,and the satisfactory cycle stability for 1000 times at 500 mA/g without obvious decline.

Zn-Na3V2(PO4)3 batteriesacetonitrileorganic-inorganic hybrid electrolyteelectrochemical stabilityreversible ion(de)intercalation

欧林娜、刘哲轩、曹鑫鑫、梁叔全

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中南大学 材料科学与工程学院,长沙 410083

中南大学 电子封装及先进功能材料湖南省重点实验室,长沙 410083

Zn-Na3V2(PO4)3电池 乙腈 有机-无机混合电解液 电化学稳定性 离子可逆脱嵌

湖南省青年科技人才(荷尖)项目国家自然科学基金资助项目国家自然科学基金资助项目

2022RC10785200240751932011

2024

10.11817/j.ysxb.1004.0609.2023-44639

中国有色金属学报
中国有色金属学会

中国有色金属学报

CSTPCD北大核心
影响因子：1.108
ISSN：1004-0609
年,卷(期)：2024.34(6)