THE ELECTROCHEMICAL PERFORMANCE OF YTTRIUM LiNi1/3Mn1/3Co1/3O2 AS CATHODE OXIDE COATED MATERIAL FOR LITHIUM-ION BATTERIES
The surface of LiNi1/3Mn1/3Co1/3O2 was coated with 1.0 wt.％ Y2O3 to improve the cycling performance for lithium-ion batteries. X-ray diffraction (XRD) of the coated material indicates Y2O3-coating does not destroy the crystal structure of LiNi1/3Mn1/3Co1/3O2, only forming a compact coating layer on the surface of it. Differential scanning calorimetry-thermal gravimetric analyses (DSC-TGA) results show the coating layer could suppress the heating release. The Y2O3-coated LiNi1/3Mn1/3Co1/3O2 possesses higher discharge capacity and better cyclability than that of the bared material. The discharge capacity of coated sample is 100.7 mAh g-1 at 2.0 C while that of bared one is only 80.0 mAh g-1. The rate of capacity retention after 12 cycles for the coated sample is 100％ at 333 K, which is much better than that of the bared one (94.9％). The chemical diffusion coefficient of Li+ ion (DLi)in the electrodes were measured by potentiostatic intermittent titration technique (PITT). The result shows that Li+ ion can move faster after coating.
cathode Y2O3-coating LiNi1/3Mn1/3Co1/3O2 Lithium-ion battery
WANG Meng CHEN Yunbo WU Feng CHEN Lin SU Yuefeng
Advanced Manufacture Technology Center China Academy of Machinery Sicence & Technology, Beijing 1000 School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, Chi
国际会议
北京
英文
450-454
2010-11-23（万方平台首次上网日期，不代表论文的发表时间）