ABSTRACT Against the backdrop of growing global attention to new energy, LiNi 0.5 Mn 1.5 O 4 (LNMO) stands out as a promising cathode material for high energy density lithium‐ion batteries. However, electrolyte decomposition tends to occur during charge‐discharge cycles, which triggers the dissolution of transition metals. Ultimately, such degradation issues severely compromise the electrochemical performance of the cathode. Magnesium (Mg) doping at Li sites not only suppresses structural degradation of LNMO during cycling but also enhances its discharge capacity. Notably, the 0.04 mol L −1 Mg 2+ ‐doped Li (LMg 0.04 NMO) delivers a discharge capacity of ∼61 mAh g −1 even at a high rate of 10 C. At a rate of 2 C, this material retains a reversible capacity of around 113 mAh g −1 with a capacity retention rate of ∼94.5% after 500 cycles. Furthermore, LMg 0.04 NMO still achieves a capacity retention rate of 89% following 1000 cycles at 10 C under the harsh condition of 55°C. Collectively, this work proposes a novel optimization strategy for the design of high‐voltage cathode materials featuring exceptional rate capability and cycling stability.
Zheng et al. (Sun,) studied this question.