Li+-conductive Li2SiO3 stabilized Li-rich layered oxide with an in situ formed spinel nano-coating layer: toward enhanced electrochemical performance for lithium-ion batteries

摘要

A novel heterostructured cathode material, comprised of a core of Li-rich layered ( R m ) oxides integrated with Li ~(+) -conductive Li _(2) SiO _(3) and an in situ formed spinel ( Fd m ) nano-coating layer, has been successfully synthesized. The ionic conductor Li _(2) SiO _(3) in the bulk facilitates the Li ~(+) intercalation/deintercalation process and stabilizes the layered structure. This is coupled with the fast 3D Li ~(+) diffusion channels of an electrochemically active spinel coating layer, leading to superior rate capability (94 mA h g ~(?1) at 10C) and excellent cycling stability in the heterostructured cathode material. This synergistic strategy may provide some new directions for synthesizing high-performance Li-ion battery cathode materials.