熔盐法制备钛酸镍及其电化学性能  

Electrochemical Performances of Nickel Titanate by Molten Salt Synthesis

作　　者：杨欣然 郭璠颖 陈浩 肖利 YANG Xin-ran;GUO Fan-ying;CHEN Hao;XIAO Li(College of Materials Science and Technology,China University of Geoscience(Beijing),Beijing 100083;Westa College,Southwest University,Chongqing 400715;School of Metallurgy and Materials Engineering,Hunan University of Technology,Hunan Zhuzhou 412007,China)

机构地区：[1]中国地质大学(北京)材料科学与工程学院,北京100083 [2]西南大学西塔学院,重庆400715 [3]湖南工业大学冶金与材料工程学院,湖南株洲412007

出　　处：《广州化工》2019年第23期57-60,90,共5页GuangZhou Chemical Industry

基　　金：国家自然科学基金(51774127);湖南省自然科学基金(2018JJ2091)

摘　　要：采用熔盐法制备钛酸镍,探讨了煅烧过程中不同熔盐比例以及不同保温时间对钛酸镍晶体结构的影响。结果表明,Ni(OH)2、TiO2和混合熔盐的摩尔比为1:1:4,800℃时通空气保温10 h,可制备黄色钛酸镍,粒径约0.3~1.0μm。制备的钛酸镍作为锂离子电池负极材料,表现出良好的电化学性能,充电倍率为0.1 C时,首次充电比容量为353.4 mA·h·g^-1。在0.1 C和0.2 C时循环100次后,容量保持率分别为99.5%和96.3%。熔盐法制备钛酸镍是一种简单、廉价、可得到高比能量锂离子电池负极材料的制备工艺。Nickel titanate was prepared by molten salt synthesis.The effects of different molten salt ratios and different holding times on the crystal structure of nickel titanate during calcination were investigated.Results showed that Nickel titanate was successfully synthesized at a temperature of 800℃for 10 h under air,and the molar ratio of raw material to molten salt was n(Ni(OH)2):n(TiO2):n(NaCl-KCl)=1:1:4.Scanning electron microscopy study revealed that the particle size was 0.3~1.0μm.The nickel titanate electrode exhibited a superior electrochemical performance,specifically a high reversible charge capacity of 353.4 mA·h·g^-1 at a current density of 0.1 C in the first cycle.After 100 cycles at 0.1 C and 0.2 C,the capacity retention rates were 99.5%and 96.3%,respectively.Molten salt synthesis of nickel titanate could be used as a simple,low-cost anode material for LiBs with a high power capacity.

关 键 词：钛酸镍 熔盐法 锂离子电池 

分 类 号：TQ134[化学工程—无机化工]