Achieving Long Cycle Life and Single-Crystal of Li-rich Mn-based Cathodes by Reheating with Sintering Additives

Abstract Lithium-rich layered oxides, as one of the most potential cathode materials for lithium-ion batteries, still need crucial improvements in mechanical strength and cycle life. Herein, we present an effective strategy to improve the compacted density and cycle stability of Li-rich materials by adding the sintering additive (H 3 BO 3 , Li 2 WO 4 ) for reheating. After reheating with a complex additive of Li 2 WO 4 and H 3 BO 3 , the compacted density increased from 3.07 to 3.29, and micromorphology changed from spherical secondary agglomerate to dispersive single crystals with micrometer size. It was found that after reheating with Li 2 WO 4 , the sample exhibited a discharge capacity of 241.9 mAh g -1 with an improved ICE of 80.9 %, and cycle life extended to 658 cycles, increased by nearly 250 cycles. This work guides the industrialization of Li-rich cathodes.