Orthorhombic LiMnO₂ as a High Capacity Cathode for Li‐Ion Cells

Orthorhombic prepared at temperatures near 100°C was evaluated for suitability as a high‐capacity cathode for Li‐ion cells. test cells showed initial reversible capacities of about 170 mAh/g of . This is much larger than that typically obtained from cells, about 110 mAh/g. The capacity of the cells is divided approximately equally between 3 and 4 V plateaus. The cells exhibit little capacity loss with cycle number when restricted to either the 3 or the 4 V plateau. The capacity loss is most rapid when the cells are cycled over both plateaus. Using cells, we investigated the reasons for the cycling behavior and capacity loss with cycle number. We believe that is an excellent candidate for the cathode of the coming generation of low‐cost, high‐energy Li‐ion cells.