|
| Research on TiO2 coating modification of LiNi0.5Mn1.5O4 |
|
Received:December 08, 2024
Revised:December 11, 2024
Accepted:December 11, 2024
Published Online:January 21, 2025
|
| View Full Text View/Add Comment Download reader |
| DOI： |
| KeyWord:lithium-ion battery; cathode material; LiNi0.5Mn1.5O4; TiO2 coating; "cathode/electrolyte" interface |
| Author | Institution |
| ZHANG Weining |
BGRIMM Technology Group Co. Ltd., Beijing Easpring Material Technology Co. Ltd. |
|
| Hits: 791 |
| Download times: 239 |
| Abstract: |
| In order to improve the electrochemical performance of the high-voltage spinel cathode material, LiNi0.5Mn1.5O4 (LNMO) was prepared by high temperature solid state method using Ni0.25Mn0.75(OH)2 as raw material. The effects of TiO2 coating and treatment temperatures on the physical and chemical properties, morphology, crystal structure, and electrochemical performance of the as-obtained samples were studied. The results show that the surface modification effect is optimal when the coating dosage is 0.5 wt% and the heat treatment temperature is 750 oC. The electrochemical properties of the coated samples are significantly improved compared with those of the pristine. The 0.1C capacity of the coin cell at 3.5-4.95 V is 130.8 mAhg-1, and the capacity retention reach 90.9% after 100 cycle. At an appropriate heat treatment temperature, both of TiO2 coating and surface doping coexist on the surface of LNMO@Ti particles. A small amount of TiO2 on the surface can preferentially react with residual HF in the electrolyte, playing a role in protecting the cathode active material. Ti ions entering the surface layer lattice can optimize the superficial structure and enhance the stability of the "cathode/electrolyte" interface during the charging and discharging cycling. |
| Close |
|
|
|