Ni(OH)_(2)负极材料的十二烷基硫酸钠辅助制备及其储锂性能  

Lithium Ions Storage Properties of Ni(OH)_(2) Anode Materials Prepared with Sodium Dodecyl Sulfate as Accessory Ingredient

作　　者：李延伟 罗康[1] 姚金环 LI Yanwei;LUO Kang;YAO Jinhuan(Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials,College of Chemistry and Bioengineering,Guilin University of Technology,Guilin 541004,China;Key Laboratory of New Processing Technology for Nonferrous Metal&Materials,Ministry of Education,College of Material Science and Engineering,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学化学与生物工程学院广西电磁化学功能物质重点实验室,桂林541004 [2]桂林理工大学材料科学与工程学院有色金属材料及其加工新技术省部共建教育部重点实验室,桂林541004

出　　处：《材料研究学报》2023年第6期453-462,共10页Chinese Journal of Materials Research

基　　金：国家自然科学基金(22065010)。

摘　　要：以十二烷基硫酸钠(SDS)为辅助剂用均相沉淀法制备出具有微/纳分级结构的α-Ni(OH)_(2)材料并使用XRD、SEM、FT-IR、TGA和XPS等手段进行表征,研究了SDS对其结构和储锂性能的影响。结果表明,在制备过程中使用SDS可细化α-Ni(OH)_(2)的晶粒并有助于形成更加开放的微/纳米分级形貌;在n(SDS)/n(Ni^(2+))为2∶10的条件下制备的α-Ni(OH)_(2)储锂性能最佳,在2 A·g^(-1)电流密度下循环40次后其比容量保持在800 mAh·g^(-1),在3 A·g^(-1)大电流密度下其可逆比容量仍达到710 mAh·g^(-1),还表现出显著的赝电容效应(在0.9 mV·s^(-1)下其赝电容贡献率高达84.2%)。α-Ni(OH)_(2) materials with micro/nano hierarchical structure were prepared by a facile homogeneous precipitation method with sodium dodecyl sulfate(SDS)as accessory ingredient.It was found that the introduction of SDS can refine the grain size ofα-Ni(OH)_(2) and facilitate the formation of micro/nano hierarchical morphology with a more open structure as evidenced by XRD,SEM,FT-IR,TGA,and XPS analysis.Results of electrochemical test demonstrate that theα-Ni(OH)_(2) sample synthesized with the n(SDS)/n(Ni^(2+))of 2∶10 exhibits the best lithium ions storage performance.After 40 cycles at the current density of 2 A·g^(-1) theα-Ni(OH)_(2) sample maintained a specific capacity of 800 mAh·g^(-1);even at the high current density of 3 A·g^(-1) it still delivered a reversible specific capacity of 710 mAh·g^(-1).Moreover,it shows a significant pseudo-capacitive effect during discharge/charge processes(the pseudo-capacitive contribution to the total stored charge is as high as 84.2%at 0.9 mV·s^(-1)).

关 键 词：无机非金属材料 氢氧化镍 均相沉淀法 负极材料 十二烷基硫酸钠 锂离子电池 

分 类 号：TQ152[化学工程—电化学工业]