While high Ni content in Ni-rich NMC cathodes leads to their high specific capacity, their structural instability results in their capacity loss and poor cyclability, thereby hindered their large-scale commercial applications. ![]() As one of the most promising cathode materials, the Ni-rich LiNixMn圜o1-x-yO2 (x=0.6) cathodes (Ni-rich NMC) have been extensively investigated because of their high specific capacity (more than 200 mAh/g). Rechargeable Li-ion batteries (LIBs) have attracted considerable attention and already been widely used in portable electronic devices and electric vehicles due to their unparalleled advantages (high energy density, high voltage, etc.). ![]() As a result, the authors believe that this review can guide researchers on developing mitigation strategies for the design of next–generation oxygen–containing cathode materials where the oxygen release is no longer a major degradation = , In addition, the engineering and materials design approaches that improve the structural integrity of the cathode materials and minimize the detrimental O 2 evolution reaction are summarized. Herein, the authors summarize the recent progress in understanding the mechanisms of the oxygen release phenomena and correlative structural degradations observed in four major groups of cathode materials: layered, spinel, olivine, and Li–rich cathodes. ![]() Oxygen release from oxygen–containing positive electrode materials is one of the major structural degradations resulting in rapid capacity/voltage fading of the battery and triggering the parasitic thermal runaway events. Widespread application of Li–ion batteries (LIBs) in large–scale transportation and grid storage systems requires highly stable and safe performance of the batteries in prolonged and diverse service conditions.
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