首页|Enhanced electrochemical performance of nanoscale single crystal NMC811 modification by coating LiNbO3
Enhanced electrochemical performance of nanoscale single crystal NMC811 modification by coating LiNbO3
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
万方数据
Single crystallization is an important strategy to resolve intergranular cracks and unnecessary side reac-tions with electrolytes in layered transition metal oxide cathodes LiNi0.8Mn0.1Co0.1O2(NMC811).Due to the limitations of high-temperature sintering and multi-step calcination,single crystal NMC811 generally shows irregular particles with a size of 2-3 μm.However,the prolonged Li-ion diffusion pathway and the stress generated by the uneven de-/intercalation sluggish Li-ion diffusion kinetics,what is more,cause structural damage such as intragranular cracks.A slow Li extraction rate or particle size reduction will ameliorate the structural damage and improve the cycling stability.As the most promising cathodes for next-generation power batteries,NMC811 required fast charge performance and cycle stability.Particle size reduction appears to be the displacement option.Nanonization is an effective strategy to mitigate intragranular cracks of single crystal NMC811.However,the serious aggregation and increased specific surface area become new challenges.In this article,we synthesized monodisperse nanoscale single crys-tal NMC811 by molten salt method and modified the surface by LiNbO3 coating.The electrochemical performance shows that nanoscale single crystal NMC811 has faster kinetic and higher capacity reten-tion,so the strategy of combining nanonization and surface coating is an alternative way to prepare high specific capacity and cycle stable single crystal NMC811.
Ni-rich NMC811Molten salt methodNanonizationSurface coatingMicron cracks
万方数据
