期刊论文

Effect of Reaction Time of Coprecipitation on Morphology and Electrochemical Properties of LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2 Cathode Material

中文

矿冶工程

0253-6099

2020

40

2

123-126

10.3969/j.issn.0253-6099.2020.02.030

51774051:国家自然科学基金 2019RS2034:湖南省湖湘青年英才 KQ1707014:国家自然科学基金 2018JJ2428:湖南省自然科学基金

本校为第一机构

采用共沉淀法制备Ni_(0.5)Co_(0.2)Mn_(0.3)(OH)_2前驱体,并通过高温固相法合成LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2正极材料,研究了反应时间对Ni_(0.5)Co_(0.2)Mn_(0.3)(OH)_2前驱体和LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2正极材料的形貌、结构以及电化学性能的影响。结果表明,随着反应时间增加,前驱体和正极材料的二次颗粒粒径逐渐增大;若反应时间过短,二次颗粒粒径小,易加剧电化学循环过程中材料与电解液的副反应,正极材料循环性能较差;若反应时间过长,二次颗粒粒径过大,增加了锂离子扩散路径,也不利于正极材料在高倍率下的循环。反应16 h制备的LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2正极材料具有适中的颗粒粒径...

Ni_(0.5)Co_(0.2)Mn_(0.3)(OH)_2 precursor was prepared by coprecipitation process,and LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2 cathode material was synthesized by a high-temperature solid-state method. The effect of reaction time on the morphology, structure and electrochemical properties of Ni_(0.5)Co_(0.2)Mn_(0.3)(OH)_2 precursor and LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2 cathode materials were investigated. Results show that with the increase of reaction time,the secondary particle sizes of precursor and material are gradually increased. If the reaction time is too short,the secondary particle size will be smal...