Layered/Spinel\nHeterostructured and Hierarchical Micro/Nanostructured\nLi-Rich Cathode Materials with Enhanced Electrochemical Properties\nfor Li-Ion Batteries

Abstract

Although\nholding a high capacity, Li-rich materials are far from\nthe demand of practical market because of their inherent drawbacks,\nsuch as poor initial efficiency and rate capability. Herein, Li-rich\nmaterials of Li_1.16Mn_0.6Ni_0.12Co_0.12O₂ have been prepared via a one-step solvothermal\nstrategy. The detail characterizations demonstrate that the as-prepared\nmaterials present morphology of nanoparticle-aggregated hierarchical\nmicrospheres and a heterostructure of layered and Li₄Mn₅O₁₂-type spinel components. Compared to materials\nof pure-layered structure, layered/spinel heterostructured materials\nexhibit simultaneously great reversible capacity (302 mAh g^–1 at 0.2 <i>C</i>), high initial Coulombic efficiency (94%\nat 0.2 <i>C</i>) and remarkable rate capability (193 mAh\ng^–1 at 10 <i>C</i>).