Improvement of Cyclic Stability of Cathode Material LiNi0.8Co0.1Mn0.1O2 by Dual SiO2@Li2SiO3 Coating
With an increase in Ni content,the capacity of high-nickel layered metal oxides(LiNixMn,Co1-x-yO2(0.8≤x＜1,NCM)greatly decreases.In view of such problem,it is proposed that singly-crystal NCM cathode material be modified by dual SiO2@Li2SiO3 coating to improve its electrochemical performance.During the synthesis process,the reaction of SiO2+2LiOH=Li2SiO3+H2O can consume the residue lithium on the material surface,thus improving diffusion kinetics of interface lithium ions and inhibiting side reaction at the interface.It is shown that the modified cathode material delivers a specific discharge capacity of 156.88 mAh/g after 120 cycles,with capacity retention rate of 70.52％.
lithium-ion batteryternary cathode materialmodificationhigh nickel layered metal oxidesurface coatinghigh energy densitycyclic stability
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