Improvement of electrochemical properties of LiNi_1/3Co_1/3Mn_1/3O₂ by coating with V₂O₅ layer

详细信息    查看全文

• 作者：Xizheng Liu^a ; ^b ; Ping He^a ; Huiqiao Li^a ; Masayoshi Ishida^b ; Haoshen Zhou^a ; ^{hs.zhou@aist.go.jp}
• 关键词：LiNi1/3Co1/3Mn1/3O2 ; Surface modification ; V2O5 coating ; Cycling performance ; Charge-transfer resistance
• 刊名：Journal of Alloys and Compounds
• 出版年：2013
• 出版时间：5 March, 2013
• 年：2013
• 卷：552
• 期：Complete
• 页码：76-82
• 全文大小：1437 K

文摘

The capacity fading and lower rate of layered cathode materials prohibited widely applications in lithium ion batteries. In this paper, V₂O₅ was coated on the surface of LiNi_1/3Co_1/3Mn_1/3O₂ to enhance its electrochemical performance at a voltage range of 2.8-4.5 V. The prepared materials were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscope (TEM). The capacity retention at the 100th cycle have been increased from 62 % to over 80 % for the 3 wt. % V₂O₅ coated sample. The rate performance has been improved by V₂O₅ coating which mainly because of the coating layer enhance the surface electronic/ionic transport. Cyclic voltammetry (CV) showed that the redox properties of the pristine sample have a more obvirous changes after charge-discharge cycles compared with the coated samples. Electrochemical impedance spectroscopy (EIS) results suggest that the V₂O₅ coating layer play an important role in suppressing the increase of cell impedance with cycling especially for the increase of charge-transfer resistance (R_ct).