AlF_3包覆对Li_(1.2)Mn_(0.534)Ni_(0.133)Co_(0.133)O_2正极材料电化学性能的影响  

Effects of AlF_3 Coating on the Electrochemical Performance of Li_(1.2)Mn_(0.534)Ni_(0.133)Co_(0.133)O_2 Cathode Materials

作　　者：王旭阳[1] 叶学海[1] 郅晓科[1] 何爱珍[1] 赵桢[1] 章甦[1] 时洁[1] 

机构地区：[1]中海油天津化工研究设计院,天津300131

出　　处：《无机化学学报》2013年第4期774-778,共5页Chinese Journal of Inorganic Chemistry

摘　　要：通过共沉淀法制备锂离子电池富锂锰基正极材料Li1.2Mn0.534Ni0.133Co0.133O2,并对其进行AlF3包覆。实验结果表明,通过AlF3包覆,材料的电化学性能得到明显提高。在0.2C下,包覆前材料的首次放电比容量为253 mAh.g-1,首次充放电效率仅为88.8%。经过AlF3包覆,材料的首次放电比容量提高到294 mAh.g-1,首次充放电效率高达96.4%。同样,在1.0C下循环50次,未包覆材料的放电比容量由225 mAh.g-1降到185 mAh.g-1,容量保持率仅为82.2%。经过AlF3包覆,材料的放电比容量由230mAh.g-1仅降为222 mAh.g-1,容量保持率高达96.5%。LiL2Mn0.534Ni0.133Co0.133O2 cathode material of lithium ion batteries was prepared by co-precipitation method, and then the cathode material was coated by A1F3. The experiment results showed that the electrochemical properties of A1F3-eoated material were improved obviously. Before coating, the initial discharge capacity was 253 mAh-g^-1 at 0.2C with a charge/discharge efficiency of only 88.8%. However, after coating, the initial discharge capacity was 294 mAh.g^-1 at 0.2C with a charge/discharge efficiency of 96.4%. Similarly, the capacity retention was also improved through A1F3 coating. The pristine material delivered a discharge capacity of only 185 mAh .g^-1 （with capacity retention of 82.2%） after 50 charge/discharge cycles at 1.0C. Meanwhile, the A1F3-eoated material delivered a discharge capacity of 222 mAh. g^-1 （with capacity retention of 96.5%） after 50 charge/discharge cycles at 1.0C.

关 键 词：锂离子电池 AlF3包覆 Li1.2Mn0.534Ni0.133Co0.133O2 充放电性能 

分 类 号：O614.111[理学—无机化学] O614.81[理学—化学]