Lithium-rich manganese(IV) oxide Li₂MnO₃ has hardly any activity as the cathode active substance of lithium-ion batteries (LIBs) but its reversible capacity can be greatly improved by introducing oxygen deficiencies. After the solid-state heat treatment of nanocrystalline Li₂MnO₃ by sodium borohydride (NaBH₄), the resulting Li₂MnO_3-δ crystallites comparatively acquire distinguishable appearances in color and shape and slight differences in surface composition and lattice structure. As a LIB cathode within the potential range of 2.5–4.7 V, at 20 mA g⁻¹ pristine Li₂MnO₃ gives the specific discharge capacities of 3.3, 5.0 and 7.4 mAh·g⁻¹ in the 1st, 10th and 100th cycles, while the derivative Li₂MnO_3-δ delivers the relatively high values of 64.8, 103.8 and 140.2 mAh·g⁻¹ in the 1st, 10th and 120th cycles, respectively. Aside from the similar phenomenon of gradual electrochemical activation, substituting Li₂MnO_3-δ for Li₂MnO₃ means the great enhancements of charge-transfer ability and electrochemical performances. Especially, the cationic-anionic redox mechanisms of Li₂MnO₃ and Li₂MnO_3-δ are similar to each other, suggesting a possible solution to prepare high-performance xLi₂MnO_3-δ·(1-x)LiMO₂ solid solutions for application purposes.

富锂的锰（IV）氧化物Li ₂ MnO ₃作为锂离子电池（LIBs）的阴极活性物质几乎没有任何活性，但通过引入缺氧可以大大提高其可逆容量。在通过硼氢化钠（NaBH ₄）对纳米晶态的Li ₂ MnO ₃进行固态热处理之后，所得的Li ₂ MnO3 _-δ微晶在颜色和形状上具有相对明显的外观，并且在表面组成和晶格结构上略有差异。作为LIB阴极，电位范围为2.5–4.7 V，在20 mA g ^-1时原始Li ₂ MnO ₃在第1个，第10个和第100个循环中给出的比放电容量分别为3.3、5.0和7.4 mAh·g ^-1，而派生的Li ₂ MnO3 _-δ提供相对较高的值64.8、103.8和140.2 mAh·g ^-1在第1个，第10个和第120个周期中。除了类似的逐渐发生电化学活化的现象外，用Li ₂ MnO3 _-δ代替Li ₂ MnO ₃意味着电荷转移能力和电化学性能的极大提高。尤其是Li ₂ MnO ₃和Li ₂ MnO3 _-δ的阳离子-阴离子氧化还原机理彼此相似，为制备用于应用目的的高性能x Li ₂ MnO3 _-δ ·（1- x）LiMO ₂固溶体提供了一种可能的解决方案。