Ti4+掺杂对正极材料LiNi0.75Mn0.25O2结构与电化学性能的影响
孟德轩 , 李振京 , 范广新 , 蔡海洋 , 刘超帅
现代化工 ›› 2025, Vol. 45 ›› Issue (1) : 105 -111.
Ti4+掺杂对正极材料LiNi0.75Mn0.25O2结构与电化学性能的影响
Effect of Ti4+ doping on structure and electrochemical performance of LiNi0.75Mn0.25O2 cathode material
以TiO2为添加剂,利用高温固相法对锂离子电池正极材料LiNi0.75Mn0.25O2进行掺杂,通过XRD、SEM、XPS和电化学测试等对材料进行表征。结果表明,Ti4+可成功掺入LiNi0.75Mn0.25O2中,在掺杂的Li[Ni0.75Mn0.25] 1-xTixO2(0≤x≤0.02)中,Ti4+不改变材料的物相和形貌,但对电化学性能有较大影响。在最佳掺Ti4+摩尔分数为1.5%时,经50周循环后材料的容量保持率由87.87%提高到95.42%,4 C放电比容量由66.47 mAh/g提升为104.00 mAh/g。
LiNi0.75Mn0.25O2 cathode material for lithium-ion battery is doped with Ti4+ via a high-temperature solid-state method with TiO2 as additive.The doped material is characterized by means of XRD,SEM,XPS,and electrochemical tests.Results show that Ti4+ can be successfully doped into LiNi0.75Mn0.25O2.In the range of 0≤x≤0.02 in Li[Ni0.75Mn0.25]1-xTixO2,Ti4+ doping does not change the physical phase and morphology of the material.However,it has a major impact on the electrochemical properties of LiNi0.75Mn0.25O2.Under the optimum Ti4+ doping mole fraction amount of 1.5%,the capacity retention rate of the material increases from 87.87% to 95.42% after 50 cycles,and the discharge capacity of LiNi0.75Mn0.25O2 at 4C enhances from 66.47mAh·g-1 to 104.00mAh·g-1.
锂离子电池 / Ti4+掺杂 / LiNi0.75Mn0.25O2 / 正极
lithium-ion battery / Ti4+ doping / LiNi0.75Mn0.25O2 / cathode
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国家自然科学基金(52071135)
国家自然科学基金(U1804135)
河南省创新人才计划(194200510019)
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