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.
In recent years, ternary nickel-rich layered oxides have gradually replaced traditional binary cathode materials in the lithium-ion battery market due to their advantages of high energy density and environmental protection. However, their structural instability of cathode materials has seriously affected the cycle performance of the battery. In order to optimize the internal structure of LiNi0.5Co0.2Mn0.3O2, the first-principle calculation was carried out in advance. The energy band density, state density and volume changes were obtained by the simulation calculation. Meanwhile, the electrochemical performance of modified LiNi0.5Co0.2Mn0.3O2 prepared by in-situ doping Na and Cl by wet grinding solid phase method was investigated. The results show that the impedance, capacity and capacity retention data are very compatible with the simulation results. The modified sample exhibits a good cyclic stability with the capacity retention of 80.91% after 80 cycles at 1 C, which is higher than that of 70.00% for commercial LiNi0.5Co0.2Mn0.3O2. The scanning electron microscope characterization indicates that the co-doping of Na and Cl can effectively alleviate the corrosion of of LiNi0.5Co0.2Mn0.3O2 surface by electrolyte. Therefore, Na and Cl doping can effectively optimize the internal structure of LiNi0.5Co0.2Mn0.3O2 and improve its electrochemical performance. The combination of simulation calculation and experiment provides a new approach for the modification of ternary cathode materials.
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