Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7998382 | Journal of Alloys and Compounds | 2015 | 5 Pages |
Abstract
Nb doped cathode materials with the formula LiNi1/3Co1/3Mn1/3âxNbxO2 (x = 0, 0.01, 0.02, 0.03) have been prepared successfully by sol-gel method. The effect of Nb substitution on the crystal structure and electrochemical properties of LiNi1/3Co1/3Mn1/3O2 were studied systematically by X-ray diffraction (XRD) and various electrochemical measurements. The results showed Nb substitution played an important role in the good cycling performance of LiNi1/3Co1/3Mn1/3O2. Charge/discharge tests revealed that LiNi1/3Co1/3Mn1/3-0.02Nb0.02O2 showed a capacity retention of 94.1% at 1 C after 50 cycles in a high cutoff voltage range (3.0-4.6 V), while discharge capacity of LiNi1/3Co1/3Mn1/3O2 remains only 89.4% of that at 1 C. Ex-situ XRD analysis and EIS analysis indicated that the improved electrochemical properties of Nb-doped sample result from the more stable structure and lower resistance during the electrochemical cycling.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Jiefan Wu, Hongguang Liu, Xuehai Ye, Jiping Xia, Yang Lu, Chaowang Lin, Xiaowei Yu,