Modern and future products such as electric vehicles and hybrid electric vehicles require batteries with higher energy densities than that of conventional batteries. Anion redox-type active materials are proposed as a new high-capacity positive electrode material for Li-ion batteries with high energy density. We developed Li₅AlO₄ as an anion redox-type active material with a higher stability than that of Co-substituted Li₂O. Li₅AlO₄ was substituted with Co by mechanical alloying with LiCoO₂ to enhance its conductivity and its reactivity as an oxide anion. Co-substituted Li₅AlO₄ showed a slightly higher electron conductivity and a remarkably higher oxide anion reactivity than the as-prepared Li₅AlO₄. From electrochemical analysis, it was shown that Co-substituted Li₅AlO₄ had a reversible capacity of approximately 140 mAh g⁻¹, while the as-prepared Li₅AlO₄ had no reversible capacity. According to the atomic valence of Co and Al and the partial structure for Co-substituted Li₅AlO₄ during the first charge-discharge cycle, we found that the charge capacity of Co-substituted Li₅AlO₄ is derived from the oxidation of oxide anions, the formation of peroxide and superoxide, and the fact that the partial structure of Co-substituted Li₅AlO₄ remains unchanged. These results indicate that the charge-discharge reaction of Co-substituted Li₅AlO₄ proceeds reversibly. Co-substituted Li₅AlO₄ demonstrates a relatively high specific capacity and good reversibility during the charge-discharge process.

诸如电动汽车和混合动力电动汽车之类的现代和未来产品需要比传统电池具有更高能量密度的电池。提出了阴离子氧化还原型活性材料作为具有高能量密度的用于锂离子电池的新型高容量正极材料。我们开发了李₅的AlO ₄为具有比共取代的李的更高的稳定性的阴离子氧化还原系活性物质₂ O.栗₅的AlO ₄通过机械合金化用Co置换为的LiCoO ₂，以提高其导电性和其作为反应性氧化物阴离子。共取代的Li ₅ AlO ₄与所制备的Li ₅ AlO ₄相比，具有更高的电子电导率和明显更高的氧化物阴离子反应性。从电化学分析表明，共取代的Li ₅ AlO ₄具有约140mAh g ^-1的可逆容量，而制得的Li ₅ AlO ₄没有可逆容量。根据Co和Al的原子价以及在第一个充放电循环中Co-取代的Li ₅ AlO ₄的部分结构，我们发现Co-取代的Li ₅ AlO ₄的充电容量该化合物源自氧化阴离子的氧化，过氧化物和超氧化物的形成以及共取代的Li ₅ AlO ₄的部分结构保持不变的事实。这些结果表明，共取代的Li ₅ AlO ₄的充放电反应可逆地进行。共取代的Li ₅ AlO ₄在充放电过程中显示出较高的比容量和良好的可逆性。