Li- and Mn-rich layered oxides exhibit high specific capacity due to the cationic and anionic reaction process during high-voltage cycling (≥4.6 V). However, they face challenges such as low initial coulombic efficiency (~70 %) and poor cycling stability. Here, we propose a combination of HBO treatment and low temperature calcination to construct a shell with cationic vacancy on the surface of LiNiMnO (LLNMO). The HBO treatment produces cationic vacancy and lattice distortion, forming an oxidized O (0
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