摘要
高镍三元材料由于具有较高的能量密度和较低的成本,成为电动汽车锂离子电池正极材料的优越选择。为了提高电池的循环性和稳定性,对三元材料进行改性很有必要。本文以硫酸钴为原料,氢氧化钠为沉淀剂,在三元前驱体Ni_(0.82)Co_(0.12)Mn_(0.06)(OH)_(2)表面包覆一层氢氧化钴,钴包覆量为0.5wt%。研究了不同的反应pH、氨水、反应温度和搅拌速度对包覆产物的影响。结果表明,优选的反应pH为10.0和11.5,pH为10.0时,包覆物沿基材外延结构继续生长,pH为11.5时,包覆物呈点状或片状均匀分布。在反应底液中加入氨水,相当于将反应pH抬高了0.5左右,但没有明显的正面作用。优选的反应温度为65℃,搅拌速度为350r/min,可以获得较好的包覆形貌和振实密度。
High nickel ternary materials have become a good choice for cathode materials of lithium ion batteries for electric vehicles due to their high energy density and low cost.In order to improve the circulability and stability of the battery,it is necessary to modify the ternary materials.In this paper,using cobalt sulfate as raw material and sodium hydroxide as precipitator,the ternary precursor Ni_(0.82)Co_(0.12)Mn_(0.06)(OH)_(2)was coated with a layer of cobalt hydroxide with a coating amount of 0.5 wt%.The effects of pH,ammonia,reaction temperature and stirring speed on the coated products were studied.The results showed that the optimal reaction pH was 10.0 and 11.5.When pH was 10.0,the coating continued to grow along the epitaxial structure of the substrate.When pH was 11.5,the coating was uniformly distributed in spots or flakes.Adding ammonia to the bottom solution of the reaction was equivalent to raising the pH of the reaction by about 0.5,but there was no obvious positive effect.The optimal reaction temperature was 65℃and the stirring speed was 350 r/min,which could obtain better coating morphology and tap density.
作者
李永光
刘更好
LI Yong-guang;LIU Geng-hao(Guangdong Brunp Recycling Technology Co.,Ltd.,Foshan,Guangdong Province,528244,China)
出处
《电池工业》
CAS
2020年第6期292-295,299,共5页
Chinese Battery Industry
关键词
硫酸钴
氢氧化钴
形貌
振实密度
Cobalt sulfate
Cobalt hydroxide
Morphology
Tap density
