Abstract
The electrochemical performances and thermostability of LiNi0.8Co0.1Mn0.1O2 is affected by temperature. High ambient temperature or irregular heat distribution accelerates the decline of LiNi0.8Co0.1Mn0.1O2 performance, shortens cathode material life. In this work, the energy storage and thermostability of the Li3VO4-coated LiNi0.8Co0.1Mn0.1O2 cathode material were studied for the first time by electrochemical calorimetry methode at different temperatures and rates. Results show that Li3VO4-coated LiNi0.8Co0.1Mn0.1O2 cathode material has excellent rate and cycle performance. The thermal electrochemical experiments further show that the thermal stability of Li3VO4-coated LiNi0.8Co0.1Mn0.1O2 cathode material in charge-discharge energy storage and conversion system is better than LiNi0.8Co0.1Mn0.1O2 at 30, 40, and 50°C. The enhanced performance can be attributed to the fact that Li3VO4 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 Li3VO4-coated LiNi0.8Co0.1Mn0.1O2 cathode material has excellent energy storage properties and thermostability, which are beneficial to the development of electronic equipment.
Highlights
As the problem of energy storage and security becomes more and more serious, the research on new energy materials becomes more and more urgent
The energy storage and thermostability properties of the LiNi0.8Co0.1Mn0.1O2 cathode materials before and after Li3VO4 coating at different temperatures and rate were investigated by electrochemical calorimetry for the first time
The results showed that the specific discharge capacities of Li3VO4-coated LiNi0.8Co0.1Mn0.1O2 cathode material at 1◦C are 194.2 (30◦C), 175.5 (40◦C), and 168.1 (50◦C) mAh g−1 and the capacity retention rates are 96.7, 95.9, and 91.4%, with excellent rate and cycle performance after 50 charge/discharge cycles
Summary
As the problem of energy storage and security becomes more and more serious, the research on new energy materials becomes more and more urgent. It indicating that the Li3VO4 surface layer inhibits the direct contact between the active material and the electrolyte, enhances the lithium ion diffusion between the electrode/electrolyte interface, and improves the electrochemical performance of the battery.
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