淀粉电解质添加剂在水系锌离子电池中的应用  

Application of Starch Electrolyte Additive in Aqueous Zinc-Ion Batteries

作　　者：蒋玲 刘睿龙 宋琪 陈鸿明 黄朔[1] 骆丽杰[1] Jiang Ling;Liu Ruilong;Song Qi;Chen Hongming;Huang Shuo;Luo Lijie(School of Material Science and Engineering,Hainan University,Haikou 570228,China)

机构地区：[1]海南大学材料科学与工程学院,海口570228

出　　处：《微纳电子技术》2024年第4期89-97,共9页Micronanoelectronic Technology

基　　金：海南省自然科学基金青年基金(223QN187)。

摘　　要：为了提升ZnSO_(4)电解液的电化学稳定性,将淀粉作为一种添加剂对其进行改性。实验结果表明,相比于ZnSO_(4)电解液,改性后的淀粉-ZnSO_(4)电解液具有更高的析氢过电位、更宽的电化学稳定窗口。将淀粉-ZnSO4电解液应用到水系锌离子电池中,有效抑制了锌枝晶和副产物的生成,并降低了电池自放电程度,表现出更优异的循环稳定性和倍率性能,在1 A·g^(-1)电流密度下循环800圈之后放电比容量保持率为81.36%,远大于ZnSO_(4)电解液体系(57.89%)。将这种电解液应用到柔性电池中同样展示出了优异的性能,具有良好的长循环寿命,在0.5 A·g^(-1)电流密度下循环800圈之后的放电比容量保持率高达92.4%。此外,该柔性电池还具有良好的抗弯形变能力,在弯曲30°、60°和90°之后仍然能够保持82.34%的放电比容量。To enhance the electrochemical stability of the ZnSO_(4) electrolyte,the electrolyte was modified by starch additive.The experimental results indicate that the modified starch-ZnSO_(4) electrolyte exhibits a higher hydrogen evolution overpotential and a wider electrochemical stability window than the ZnSO_(4) electrolyte.When applied to aqueous zinc-ion battery,the starch-ZnSO_(4) electrolyte effectively suppresses the formation of Zn dendrites and by-products,and mitigates self-discharge behavior,showing a better cycle stability and rate performance.After 800 cycles at a current density of 1 A·g^(-1),the discharge specific capacity retention rate is 81.36%,which is much higher than that of ZnSO_(4) electrolyte(57.89%).Furthermore,the flexible battery with the starch-ZnSO_(4) electrolyte exhibits excellent performance,showing a good long cycling life.After 800 cycles at a current density of 0.5 A·g^(-1),the discharge specific capacity retention rate of the flexible battery reaches 92.4%.In addition,the flexible battery also exhibits an excellent resistance to bending deformation,and maintains a discharge specific capacity retention rate of 82.34%after bending at different angles of 30°,60°and 90°.

关 键 词：水系锌离子电池 淀粉 添加剂 锌枝晶 电解液 

分 类 号：TM911[电气工程—电力电子与电力传动]