Thermo-electrochemical study of co-modified Li2O-2B2O3-(LiNi0.5Co0.2Mn0.3)0.98Zr0.02O2 cathode material
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In order to improve the thermal stability of the LiNi0.5Co0.2Mn0.3 cathode material, the co-modified Li2O-2B2O3-(LiNi0.5Co0.2Mn0.3)0.98Zr0.02O2 (LBO-NCMZ) is prepared. The XRD, SEM, and Raman show a better layered structure and spherical shape after charging and discharging at high temperature compared with the pristine material. The DSC results show that there is no peak after an endothermic peak at 58.52 °C, which prove that the material structure remains stable after one phase transformation. The NCM(LiNi0.5Co0.2Mn0.3O2) cathode material has three endothermic peaks at higher temperatures 131.93 °C, 155.96 °C, and 195.38 °C. The thermal change of LBO-NCMZ is lower than NCM. At this external constant rate, the LBO-NCMZ material is less affected by temperature; it has lower ΔH value and better thermal stability than NCM. Therefore, the proposed structure-surface optimization method has a positive effect on thermal stability and can effectively solve the battery thermal safety problem.
KeywordsCo-modified LiNi0.5Co0.2Mn0.3O2 Electrochemical-calorimetric method Thermostability
This work was financially supported by the National Natural Science Foundation of China (Nos. 21501015, 51604042, 31527803, and 21545010).
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