Highly enhanced electrochemical performances of LiNi0.815Co0.15Al0.035O2 by coating via conductively LiTiO2 for lithium-ion batteries |
| |
| Affiliation: | 1. School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha 410114, China;2. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong;3. Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410004, Hunan, China;1. School of Metallurgy and Environment, Central South University, Changsha, 410083, PR China;2. School of Materials Science and Engineering, The University of New South Wales, Sydney, 2052, Australia;1. CAS Key Laboratory of Materials for Energy Conversions, Department of Materials Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China, Anhui, Hefei, 230026, China;2. State Key Laboratory of Fire Science, University of Science and Technology of China, Anhui, Hefei, 230026, China;1. School of Metallurgy and Environment, Central South University, Changsha, 410083, PR China;2. School of Energy and Power Engineering, Changsha University of Science & Technology, Changsha, 410114, PR China;3. School of Materials Science and Engineering, The University of New South Wales, Sydney, 2052, Australia |
| |
| Abstract: | LiTiO2 film-coated layered LiNi0.815Co0.15Al0.035O2 (NCA) material was successfully synthesised through in situ hydrolysis–lithiation to improve electrochemical properties. Herein, NCA was synthesised using solid state reaction, coated by hydrolysis of tetrabutyl titanate and subjected to lithiation process. The optimal molar ratio (LiTiO2: NCA) was found to be 1.0 mol%, and the thickness of LiTiO2 film coated on the surface of NCA of 18 nm was observed through HRTEM images. Compared with pristine NCA, 1.0 mol% LiTiO2-coated NCA demonstrated better electrochemical performance with larger capacity of 20 mAh g−1 under 1 C after 100 cycles. Its related capacity retention was 90.8%. The 1.0 mol% LiTiO2-coated sample exhibited high discharge capacity of 157.6 mAh g−1 at a current rate of 10 C, whereas the pristine sample only presented 145.3 mAh g−1. The considerably improvement of the rate and cycling properties of the NCA cathode material is achieved using LiTiO2 as a Li+-conductive coating layer. These new findings contribute towards the design of a stable-structured Ni-rich material for lithium-ion batteries. |
| |
| Keywords: | Coating Cathode material Lithium-ion batteries |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
