SDBS插层与吸附协同增强片状镍钴氢氧化物的电化学性能  

SDBS Intercalation and Adsorption Synergistically Enhance the Electrochemical Performance of Flaky Nickel-Cobalt Hydroxide

作　　者：刘志伟[1] 武婵 遆鑫森 刘有智[1] LIU Zhiwei;WU Chan;TI Xinsen;LIU Youzhi(Shanxi Province Key Laboratory of HigeeOriented Chemical Engineering,School of Chemistry and Chemical Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学化学与化工学院,超重力化工过程山西省重点实验室,太原030051

出　　处：《材料导报》2025年第10期11-18,共8页Materials Reports

基　　金：国家自然科学基金青年基金(21706245);山西省研究生创新项目(2021Y606;2022Y615)。

摘　　要：镍钴层状双氢氧化物(Ni-Co LDH)具有高的理论比容量与丰富的化学活性位点,但片状Ni-Co LDH存在比容量偏低、倍率性能较差等问题。针对以上问题,本工作采用溶剂热法制备片状Ni-Co LDH电极材料,并以十二烷基苯磺酸钠(SDBS)的水溶液为插层剂,重点探究液相插层改性前后电极材料的形貌、结构与电化学性能的变化规律。结果表明,SDBS插层与吸附双重作用能够扩大Ni-Co LDH的层间距,并增强电极材料的表面活性,进而加快电解质离子的扩散,提升其比容量和倍率性能;改性后的Ni-Co LDH比容量为677 C/g(1504 F/g,2 A/g),其容量保持率为72%(1~30 A/g),明显优于未改性的材料。此外,电化学动力学分析进一步表明,SDBS插层与吸附作用显著提升Ni-Co LDH电池型电极材料的容量贡献占比。最后,以改性Ni-Co LDH为正极材料,活性炭(AC)为负极材料,组装混合电容器,其在功率密度为363 W/kg时,具有46 Wh/kg的能量密度。本工作提出SDBS插层与吸附增强Ni-Co LDH电化学性能的思路,可为高性能电极材料的制备提供参考。Nickel-cobalt layered double hydroxide(Ni-Co LDH)has a high theoretical specific capacity and rich chemically active sites.However,flaky Ni-Co LDH has problems such as low specific capacity and poor rate capability.To address these problems,this work adopts a solvent thermal method to prepare Ni-Co LDH electrode materials,and an aqueous solution of sodium dodecylbenzene sulfonate(SDBS)as the intercalator.The morphological structure and electrochemical properties of the electrode materials before and after liquid-phase intercalation have been investigated.It is found that the SDBS intercalation and adsorption can expand the layer spacing of Ni-Co LDH,enhance the surface activity of electrode materials,and thus accelerate the diffusion of electrolyte ions,improving its specific capacity and rate capability.The specific capacity of the mo-dified Ni-Co LDH was 677 C/g(1504 F/g,2 A/g),and its capacity retention rate was 72%(1—30 A/g),which was significantly better than that of the unmodified material.In addition,the electrochemical kinetic analysis further shows that the SDBS intercalation and adsorption substantially improve the capacity contribution of Ni-Co LDH battery-type electrode material.Finally,the enhanced Ni-Co LDH was used as the positive electrode material and activated carbon(AC)as the negative electrode material to assemble a hybrid capacitor.It had a high energy density of 46 Wh/kg at a power density of 363 W/kg.This work proposes an idea of SDBS intercalation and adsorption to enhance the electrochemical performance of Ni-Co LDH,which can be used as a reference for synthesizing high-performance electrode materials.

关 键 词：镍钴层状双氢氧化物 插层与吸附 电化学性能 混合电容器 

分 类 号：TQ152[化学工程—电化学工业]