摘要
LiNi_(1/3)Co_(1/3)Mn_(1/3)O_(2)(LNCM)因其高比容量等优点在动力电池领域受到广泛关注。然而,较差的循环性能和严重的安全问题限制了其应用前景。离子掺杂是提高材料电化学性能的有效方法之一。采用溶胶凝胶法,以NH_(4)VO_(3)为钒源,成功制备了钒掺杂LiNi_(1/3)-xCo_(1/3)Mn_(1/3)VxO_(2)正极材料。结果表明:LiNi_(1/3-0.02)Co_(1/3)Mn_(1/3)V_(0.02)O_(2)(LNCMV)电极材料表现出优秀的储锂性能(0.5 C时,80次循环后,放电比容量为169 mAh/g)。通过V^(5+)替代LiNi_(1/3)Co_(1/3)Mn_(1/3)O_(2)正极材料中部分Ni^(2+)离子,有效地降低了Li^(+)/Ni^(2+)离子混排,稳定了正极材料的晶体结构,Li^(+)离子的扩散系数得到增加,使Li^(+)脱嵌过程中LNCM-V材料结构变得更加稳定。
LiNi_(1/3)Co_(1/3)Mn_(1/3)O_(2)(LNCM)cathode material with high specific capacity has received extensive attention in power batteries.However,the serious safety issues and poor cycle performance limit its application prospect.Doping is one of the effective methods to boost the electrochemical performance of electrode materials.Vanadium-doped LiNi_(1/3-x)Co_(1/3)Mn_(1/3)VxO_(2) cathode material was successfully prepared by the sol-gel method using NH_(4)VO_(3) as vanadium source.The research results show that by replacing some Ni^(2+)ions in the LiNi_(1/3)Co_(1/3)Mn_(1/3)O_(2) cathode material by V^(5+),the cation mixing is effectively reduced,the crystal structure of the cathode material is stabilized,and the diffusion coefficient of Li^(+)in the lattice increases.And the LiNi_(1/3-0.02)Co_(1/3)Mn_(1/3)V_(0.02)O_(2)(LNCM-V)electrode material exhibits excellent lithium storage performance(the discharge capacity is 169 mAh/g at 0.5 C after 80 cycles).
作者
郑浩
王仕伟
孟伟巍
Zheng Hao;Wang Shiwei;Meng Weiwei(Pangang Group Research Institute Co.,Ltd.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,Sichuan,China)
出处
《钢铁钒钛》
CAS
北大核心
2022年第4期10-15,共6页
Iron Steel Vanadium Titanium
