Study on Electrochemical Performance of Surface-modified Nickel-rich Cathode Material LiNi_0.83Co_0.12Mn_0.05O₂ by Piezoelectric Material K_0.5Na_0.5NbO₃ AITranslate

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Chinese Library Classification Number:TB34[一般工业技术—材料科学与工程]

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The piezoelectric material K_0.5Na_0.5NbO₃(KNN)surface-modified nickel-rich cathode material LiNi_0.83Co_0.12Mn_0.05O₂was prepared by in-situ coating,and the electrochemical performance of the as-prepared material was also studied.The XRD pattern shows that the sample modified with KNN does not change the layered structure of the nickel-rich cathode material.The XRD refinement results also confirm the existence of KNN by which the crystal structure of the bulk material is not affected.Meanwhile,the EDS Mapping analysis demonstrates that KNN has successfully coated the surface of the nickel-rich ca-thode material.Based on the measured electrochemical performance,in the voltage range of 2.8~4.3 V,the initial discharge specific capacity of the modified sample KNN@NCM83 increases at 0.1 C rate.More-over,after 100 cycles,the modified sample still maintains a discharge specific capacity of 157.8 mA·h/g with a capacity retention rate of 82.3%,while the pristine sample NCM83 only maintains a discharge specific capacity of 133.6 mA·h/g with a capacity retention rate of 75.2%.Compared with the pristine sample,KNN@NCM83 presents a better rate performance and particularly,its specific discharge capacity reaches 155.6 mA·h/g and 148.6 mA·h/g respectively at 5 C and 10 C.This indicates that KNN could effectively improve the Li⁺transmission efficiency of the nickel-rich cathode material,which could improve the rate performance of the sample in turn.The EIS test results show that the solid electrolyte interface film(CEI film)generated on the surface of KNN@NCM83 electrode after cycling is thin and stable with low charge transfer resistance,which fully demonstrates that the modified sample has a stable structure and good reversibility.