为优化富锂锰基正极材料表面结构并提高其能量密度，对富锂锰基正极材料先后进行低镍化处理和酸蒸汽表面处理。实验结果表明，经过低镍化和酸蒸汽表面处理的材料首次放电比容量高达315 mAh/g，且0.5 C下循环100次后，容量保持率约为81%。低镍化和酸蒸汽表面处理方式能提高材料放电比容量，并大大改善材料的循环稳定性。

To optimize the surface structure of lithium-rich manganese-based cathode materials and improve its energy density,the lithium-rich manganese-based cathode material is firstly treated to reach low-nickel and then its surface is treated by acid vapor.The experimental results show that the first-time discharge specific capacity of st-LLO is as high as 315 mAh·g^-1,and its capacity can retain about 81% after 100 cycles at 0.5 C.It is proved that the surface treatments for low-nickel and by acid vapor are favorable to the improvement of discharge specific capacity and cycle stability.

陈婧妍(1993-),女,硕士研究生,研究方向为锂离子电池,jingychen@outlook.com