The rapid market growth of rechargeable batteries requires electrode materials that combine high power and energy and are made from earth-abundant elements. Here we show that combining a partial spinel-like cation order and substantial lithium excess enables both dense and fast energy storage. Cation overstoichiometry and the resulting partial order is used to eliminate the phase transitions typical of ordered spinels and enable a larger practical capacity, while lithium excess is synergistically used with fluorine substitution to create a high lithium mobility. With this strategy, we achieved specific energies greater than 1,100 Wh kg^–1 and discharge rates up to 20 A g^–1. Remarkably, the cathode materials thus obtained from inexpensive manganese present a rare case wherein an excellent rate capability coexists with a reversible oxygen redox activity. Our work shows the potential for designing cathode materials in the vast space between fully ordered and disordered compounds.

可充电电池市场的快速增长需要电极材料结合高功率和能量，并由富含地球的元素制成。在这里，我们表明，将部分尖晶石样阳离子顺序和大量的锂过量结合使用，既可以实现密集储能又可以实现快速储能。阳离子化学计量比和所得的部分顺序可用于消除有序尖晶石典型的相变并实现更大的实际容量，而过量锂则与氟取代协同使用以产生高锂迁移率。通过这种策略，我们实现了大于1,100 Wh kg ^–1的比能和高达20 A g ^–1的放电率。值得注意的是，从廉价的锰中获得的正极材料很少见，其中极好的速率能力与可逆的氧氧化还原活性并存。我们的工作表明，在完全有序和无序化合物之间的广阔空间中设计阴极材料的潜力。