Joule
ArticleReversible anionic redox chemistry in layered Li4/7[□1/7Mn6/7]O2 enabled by stable Li–O-vacancy configuration
Context & scale
High-energy-density cathode materials for Li-ion batteries are developed along the avenue of configuration transition from conventional Li–O-transition metal (TM) to typical Li–O–Li. It achieved a great increase in energy density because anionic redox activities can provide additional capacities. However, the utilization of anionic redox chemistry based on a typical Li–O–Li configuration always suffers from inherent issues such as serious oxygen release and induced structural distortion, further resulting in the rapid decay of energy density upon cycling. To address these problems, new configurations should be designed to achieve additional capacity and restrain oxygen release, which is significant for the commercialization of high-energy-density Li-rich cathode materials. Besides, the discovery of new configurations will undoubtedly excite the immediate interest of a wide audience of chemistry scientists to develop various advanced cathode materials.