铌复合钇共掺杂改善高镍单晶三元正极材料的高温电化学性能研究
High Temperature Electrochemical Performance of Monocrystalline High-Nickel Ternary Cathode Material Improved by Co-Doping of Yttrium and Niobium Elements
李崇 1马娜妮 1王子钰 1张彩红 1王慧萍1
作者信息
- 1. 陕西彩虹新材料有限公司,陕西 咸阳 712021
- 折叠
摘要
为解决高镍单晶三元正极材料表面残碱高、高温循环性能差等问题,利用铌与钇等元素共同掺杂对正极材料进行改性,提高其电化学性能.以高镍单晶三元前驱体Ni0.6 Co0.1 Mn0.3(OH)2 为原料,采用高温固相反应合成不同双元素掺杂系列正极材料.结果表明,Nb与Y双掺杂样品具有优异的高温循环稳定性和倍率性能,45℃下循环50 圈后,铌与钇双掺杂样品的容量保持率较单掺铌样品高 2.58 个百分点;2C倍率充放电条件下,铌与钇双掺杂样品放电容量比单掺铌的样品高 6.2 mAh/g.
Abstract
Aiming at the shortcomings of single crystalline high-nickel ternary cathode material,including high residual alkali on the surface,poor cycle performance at high temperature,co-doping with niobium and yttrium was proposed to modify the cathode material for improving its electrochemical performance.With monocrystalline high-nickel ternary precursor(Ni0.6 Co0.1 Mn0.3(OH)2)as raw material,a series of cathode materials co-doped with two different elements were synthesized by high-temperature solid-state reaction.The results show that the niobium and yttrium co-doped sample presents excellent cycling stability and rate capability at high temperature.Compared to niobium-doped sample,it can have capacity retention rate higher by 2.58 percentage points after 50 cycles at 45℃,and discharge capacity higher by 6.2 mAh/g at 2C charge-discharge rate.
关键词
高镍/单晶三元正极材料/正极材料/铌掺杂/钇掺杂/共掺杂/高温电化学性能/高温固相反应Key words
high nickel/monocrystalline ternary cathode materials/cathode material/niobium-doped/yttrium-doped/co-doping/high-temperature electrochemical performance/high-temperature solid-state reaction引用本文复制引用
出版年
2024
NETL
NSTL
万方数据