Construction of homogeneously Al3+ doped Ni rich Ni-Co-Mn cathode with high stable cycling performance and storage stability via scalable continuous precipitation

Abstract

Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode materials have been considered as one of the promising candidates for high energy density lithium-ion battery, but they still suffer from capacity fading and safety caused by structural degradation, insufficient thermal stability and poor storage properties. In the current work, homogeneously Al3+ doped Ni rich cathode with high stable cycling performance and storage stability was constructed via scalable continuous precipitation. With the more homogeneous distribution of Al3+ in the secondary agglomerates, the Ni rich cathode synthesized from Al3+ doped hydroxide precursor showed more perfect sphere, decreased ratio of Ni2+/Ni3+ and Li+/Ni2+ disorder in the internal of agglomerates. The homogeneously Al3+ doped Ni rich LiNi0.8Co0.1Mn0.09Al0.01O2 cathode exhibited much improved cycling performance, with a capacity retention of 78.92% at 1 C rate after 200 cycles, and a capacity retention of 70.0% at 10 C rate after 1000 cycles. Additionally, the homogeneous substitution of Al could significantly prevent the reaction with H2O and CO2 during storage process and improve storage stability.