摘要
The single-crystalline Ni-rich cathodes are believed to help improve the safety of Li-ion batteries(LIBs),however,the ion-diffusion limits their high-rate performance owing to large single-crystal particles.Herein,a dual-modification strategy of surface Li_(2)TiO_(3)-coating and bulk Ti-doping has been performed to achieve high-rate single crystal LiNi_(0.83)Co_(0.12)Mn_(0.05)O_(2)(NCM)cathode.The Li-ion conductive Li_(2)TiO_(3) coating layer facilitates the Li-ion transfer and prevents the electrolyte erosion.Meanwhile,the robust Ti-O bonds stabilize the cubic close-packed oxygen framework and mitigate the Li/Ni disorder.The synergy endows the dual-modified NCM with enhanced de-/lithiation reaction kinetics and stable surface chemistry.A high specific capacity of 128 mAh g^(-1) is delivered even at 10 C with an extended cycle life.This finding is reckoned to pave the way for developing high energy density LIBs for long-range electric vehicles.
基金
supported by the National Natural Science Foundation of China(Nos.21838003,21978088,and 91834301)
the Innovation Program of Shanghai Municipal Education Commission
the Fundamental Research Funds for the Central Universities(No.222201718002)。
