Previously conducted high-throughput ab initio calculations have identified carbonophosphates as a new class of polyanion cathode materials. Li 3 MnCO 3 PO 4 is the most promising candidate due to its high theoretical capacity and ideal voltage range. However, a major limitation of this material is its poor cyclability and experimentally observed capacity. In this work we synthesize Li 3 Fe 0.2 Mn 0.8 CO 3 PO 4 to combine the high theoretical capacity of Li 3 MnCO 3 PO 4 with the high

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... y of Li 3 FeCO 3 PO 4 . Li 3 Fe 0.2 Mn 0.8 CO 3 PO 4 outperforms Li 3 MnCO 3 PO 4 in cyclability, and shows little capacity fade over 25 cycles. The observed reversible capacity of 105 mAh/g is slightly greater than in Li 3 FeCO 3 PO 4 , and occurs at a higher average voltage. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 207.241.231.82 Downloaded on 2018-07-21 to IP