![]() ![]() The up-to-date advances on high-capacity transition metal oxide cathode materials for SIBs are then classified and summarized in different groups associated with or without anionic redox. In this review, studies on anionic redox are first systematically introduced. ![]() Moreover, transition metal oxides with mixed phase also demonstrate great potential. A similar phenomenon exists in SIBs, which even applies to Na-deficient transition metal oxides. The anionic redox reaction in Li-rich transition metal oxides is capable of providing extra capacity in addition to the cationic redox activities in lithium-ion batteries. ![]() Sodium transition metal oxides are considered to be one of the most promising cathode materials for SIBs. The exploration of next-generation sodium-ion batteries (SIBs) is a worldwide concern to replace the current commercial lithium-ion batteries, mitigating the increasing exhaustion of Li resources. ![]()
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