Energy Storage and Thermostability of Li(3)VO(4)-Coated LiNi(0.8)Co(0.1)Mn(0.1)O(2) as Cathode Materials for Lithium Ion Batteries

The electrochemical performances and thermostability of LiNi(0.)8Co(0.1)Mn(0.1)O(2) is affected by temperature. High ambient temperature or irregular heat distribution accelerates the decline of LiNi(0.8)Co(0.1)Mn(0.1)O(2) performance, shortens cathode material life. In this work, the energy storage and thermostability of the Li(3)VO(4)-coated LiNi(0.8)Co(0.1)Mn(0.1)O(2) cathode material were studied for the first time by electrochemical calorimetry methode at different temperatures and rates. Results show that Li(3)VO(4)-coated LiNi(0.8)Co(0.1)Mn(0.1)O(2) cathode material has excellent rate and cycle performance. The thermal electrochemical experiments further show that the thermal stability of Li(3)VO(4)-coated LiNi(0.8)Co(0.1)Mn(0.1)O(2) cathode material in charge-discharge energy storage and conversion system is better than LiNi(0.8)Co(0.1)Mn(0.1)O(2) at 30, 40, and 50°C. The enhanced performance can be attributed to the fact that Li(3)VO(4) 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 Li(3)VO(4)-coated LiNi(0.8)Co(0.1)Mn(0.1)O(2) cathode material has excellent energy storage properties and thermostability, which are beneficial to the development of electronic equipment.