采用3种含铝化合物（AlPO₄、Al₂O₃和AlF₃）对富锂锰基材料Li_1.2[Mn_0.54Co_0.13Ni_0.13]O₂进行表面包覆改性，研究了表面包覆对富锂锰基材料的首圈库伦效率和循环性能的影响。结果表明，与原始的Li_1.2[Mn_0.54Co_0.13Ni_0.13]O₂的库伦效率（71.0%）相比，经过AlPO₄表面包覆改性的Li_1.2[Mn_0.54Co_0.13Ni_0.13]O₂库伦效率最高，达到了86.3%。经过50圈循环后，相比于原始的Li_1.2[Mn_0.54Co_0.13Ni_0.13]O₂的容量保持率（58.9%），由Al₂O₃表面包覆改性的容量保持率提高最大，为96.1%。经过AlF₃表面包覆改性的Li_1.2[Mn_0.54Co_0.13Ni_0.13]O₂综合性能最佳，其首圈库伦效率达到了81.1%，容量保持率达到了92.4%。

Lithium-rich manganese-based material Li_1.2[Mn_0.54Co_0.13Ni_0.13]O₂ is modified through being coated respectively by three kinds of aluminum-containing compound (AlPO₄,Al₂O₃ and AlF₃).The influences of the surface coating on the initial-circle coulombic efficiencies and cyclic properties of the lithium-rich manganese-based material are studied.It is shown that the uncoated Li_1.2[Mn_0.54Co_0.13Ni_0.13]O₂ has an initial coulombic efficiency of 71.1%,Li_1.2[Mn_0.54Co_0.13Ni_0.13]O₂ coated by AlPO₄ exhibits the highest initial coulombic efficiency,86.3%.After 50 cycles,the capacity retention of uncoated Li_1.2[Mn_0.54Co_0.13Ni_0.13]O₂ is just 58.9%,that of Li_1.2[Mn_0.54Co_0.13Ni_0.13]O₂ coated with Al₂O₃ is the best,reaching 96.1%.Li_1.2[Mn_0.54Co_0.13Ni_0.13]O₂ coated with AlF₃ possesses the best comprehensive property,with an initial coulombic efficiency of 81.1% and a capacity retention of 92.4%.

徐祎晟(1993-),男,硕士研究生,研究方向为锂离子电池正极材料,yishengxu93@163.com