Energy Storage and Thermostability of LiVO-Coated LiNiCoMnO as Cathode Materials for Lithium Ion Batteries.

The electrochemical performances and thermostability of LiNi8CoMnO is affected by temperature. High ambient temperature or irregular heat distribution accelerates the decline of LiNiCoMnO performance, shortens cathode material life. In this work, the energy storage and thermostability of the LiVO-coated LiNiCoMnO cathode material were studied for the first time by electrochemical calorimetry methode at different temperatures and rates. Results show that LiVO-coated LiNiCoMnO cathode material has excellent rate and cycle performance. The thermal electrochemical experiments further show that the thermal stability of LiVO-coated LiNiCoMnO cathode material in charge-discharge energy storage and conversion system is better than LiNiCoMnO at 30, 40, and 50°C. The enhanced performance can be attributed to the fact that LiVO coating promotes the transmission of lithium ions and protects the active material from electrolyte corrosion at different temperature, as well as reduces side reaction, electrode polarization and heat generation of cathode materials. The LiVO-coated LiNiCoMnO cathode material has excellent energy storage properties and thermostability, which are beneficial to the development of electronic equipment.