Design Strategies for Enhancing the Electrochemical Performance of Li-Rich Cathode Materials for Lithium-Ion Batteries

摘要

Lithium-ion batteries (LIBs) are one of the most promising energy storage technologies for manyapplications, such as environmentally friendly transportation. The cathode is the most importantmaterial in LIBs and determines mainly their energy density, life and cost. Li-rich layered oxidesxLi2MnO3×(1-x)LiMO2 (M=Mn, Ni, Co) have been recognized as the most attractive candidates fornext-generation cathode materials due to their extremely high reversible capacity. However, severetechnical issues (mainly, the low initial Coulomb efficiency, poor rate capability, and voltage decayduring cycling) need to be addressed. In this review, we summarize recent research progress on Li-richlayered oxide cathode materials. We focus on new strategies for tackling the technical challenges ofLi-rich layered oxide cathode materials, which include exposing preferential crystal planes, inducingoxygen/lithium defects, forming spinel-layered or olivine-layered heterogeneous structures and tuningthe lattice structure. Future research directions for Li-rich cathode materials are finally proposed forcommercial applications..