Stalling oxygen evolution in high-voltage cathodes by lanthurization
High energy density has become a crucial factor in the future development of batteries. One key aspect is the development of high-voltage cathode materials. However, during high-voltage operation, cathode materials face challenges such as crystal structure degradation (e.g., lattice oxygen release), electrolyte decomposition leading to battery failure, and safety issues like thermal runaway. Taking lithium cobalt oxide cathode as an example, serious structural degradation and oxygen release occur when the upper voltage limit is increased from 4.2 V to 4.6 V.
A team led by Fuqiang Huang from Peking University and Ju Li from MIT, among others, conducted a systematic analysis of the oxygen evolution issue in high-voltage layered cathode materials. They proposed a universal strategy to significantly improve the high-voltage stability of layered cathode materials. This strategy is based on controllable liquid-phase ion exchange reactions, which not only achieve high uniformity of coating but also enhance the ion bonding between transition metals and oxygen. It inhibits the migration of reactive oxygen to the surface. The strategy demonstrates good universality and can be applied to all layered oxide cathodes, enabling large-scale production. It provides a new approach for the industrialization of high-voltage ternary nickel-rich cathodes and lithium-rich manganese-based cathodes. This work was published in the top-tier journal Nature Energy, with Mingzhi Cai and Yanhao Dong as co-first authors.
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