一种低成本的非水系高浓盐锌离子电解液  

A Low-Cost Non-Aqueous Highly Concentrated Salt Zinc Ion Electrolyte

作　　者：王佳 李桂村[1] WANG Jia;LI Guicun(College of Materials Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]青岛科技大学材料科学与工程学院,山东青岛266042

出　　处：《青岛科技大学学报（自然科学版）》2024年第4期41-48,共8页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：山东省自然科学基金项目(ZR2019MB037).

摘　　要：非水系电解液理论上可以与锌金属负极兼容,使其保持高化学稳定性和电化学可逆性,但目前对该体系的研究仅局限于低浓度体系。研究发现了一种低成本的三氟乙酸锌和乙腈的高浓锌离子电解液,其浓度最高可达到15 mol·kg^(-1)。利用该体系探究了浓度对电解液离子溶剂化和电化学性能的影响。在非水系电解液中,浓度的增加降低了与锌负极的兼容性,库伦效率降低至55.35%,但在中等浓度(5 mol·kg^(-1))时实现锌均匀平整沉积。高浓电解液中乙腈和CF_(3)COO^(-)阴离子全部参与Zn^(2+)的溶剂化结构,形成大量聚集离子对。最后与Na_(3)V_(2)(PO_(4))_(3)正极构建全电池进行测试。此外,研究中发现锌盐的低缔合常数并不是高溶解度必要条件。Non-aqueous electrolytes are theoretically compatible with zinc metal cathodes,allowing them to maintain high chemical stability and electrochemical reversibility,but current research on this system is limited to low concentration systems.Here,our first study identified a low-cost highly concentrated zinc ion electrolyte of zinc trifluoroacetate and acetonitrile with concentrations up to 15 mol·kg^(-1).We explored the effect of concentration on the ion solventized structure and electrochemical properties of the electrolyte using this system.In the non-aqueous electrolyte,the concentration increase reduces the compatibility with the zinc cathode and the Coulomb efficiency decreases to 55.35%,but uniform and flat deposition of zinc is achieved at moderate concentrations(5 mol·kg^(-1)).The acetonitrile and CF_(3)COO^(-)anions in the highly concentrated electrolyte are all involved in the solventized structure of Zn^(2+),forming many aggregated ion pairs.In addition,the low association constants of zinc salts were not found to be necessary for high solubility in the study.

关 键 词：三氟乙酸锌 乙腈 高浓电解液 锌离子电池 

分 类 号：TQ207.2[化学工程—有机化工]