无机材料学报2026，Vol.41Issue(8)：1069-1077,中插1-中插2,11.DOI:10.15541/jim20250320
Mg-Cr共掺LiNi0.5Mn1.5O4包覆LiNi0.8Co0.1Mn0.1O2锂离子电池正极材料
LiNi0.8Co0.1Mn0.1O2 Coated with Mg-Cr Co-doped LiNi0.5Mn1.5O4 as Cathode Material for Li-ion Battery
摘要
Abstract
LiNi0.8Co0.1Mn0.1O2(NCM811)emerged as one of the crucial cathode materials in the field of power batteries owing to its high theoretical specific capacity.However,when the charging voltage exceeds 4.3 V,the material is prone to structural phase transitions and severe interfacial side reactions with the electrolyte,leading to increased interfacial impedance and rapid capacity fading,which restricts the further improvement of its energy density.In this study,a synergistic modification strategy is proposed:a synchronous lithiation process is adopted to prepare Mg-Cr co-doped LiNi0.5Mn1.5O4(LNMO)as the coating layer.This coating layer inherits the high operating voltage,three-dimensional lithium ion transport channels,and excellent electrochemical stability of LNMO.Meanwhile,Mg-Cr co-doping enhances the ionic/electronic conductivity of LNMO and inhibits the dissolution of Mn elements.The results demonstrate that the Mg-Cr co-doped LNMO coating modification reduces the degree of Li⁺mixing in the NCM811 cathode material.The modified cathode material exhibits outstanding performance in the voltage range of 2.7-4.5 V.It delivers an initial discharge specific capacity of 212.74 mAh·g-1 at 0.1C(1C=200 mA·g-1),a discharge specific capacity of 182.32 mAh·g-1 at a high rate of 5C,and a capacity retention rate of 77.09%after 100 cycles at 1C.Its electrochemical performance is significantly superior to that of the unmodified and stepwise-coated samples.This strategy improves the stability and electrochemical performance of NCM811 by suppressing interfacial side reactions and reducing charge transfer resistance,thereby providing an effective approach for the optimization of high-voltage and high-nickel cathodes.关键词
NCM811/LNMO包覆/Mg-Cr共掺杂/同步锂化Key words
NCM811/LNMO coating/Mg-Cr co-doping/synchronous lithiation分类
化学化工引用本文复制引用
刘博宇,王腾飞,庞青,李秀芬,望红玉..Mg-Cr共掺LiNi0.5Mn1.5O4包覆LiNi0.8Co0.1Mn0.1O2锂离子电池正极材料[J].无机材料学报,2026,41(8):1069-1077,中插1-中插2,11.基金项目
青海省科技国际合作专项(2022-HZ-811) Science and Technology International Cooperation Project of Qinghai Province(2022-HZ-811) （2022-HZ-811）
