Enhancing the cycle stability of Zr-doped LiNi0.83Co0.12Mn0.05O2 by co-precipitation

Abstract

The ternary cathode material LiNi 0.83 Co 0.12 Mn 0.05 O 2 (NCM) has excellent properties, such as superior energy density, low cost, and high voltage platform. Recently, it becomes one of the research hotspots of lithium-ion batteries (LIBs). However, NCM has insufficient cycle stability and cannot meet the demand for the high-rate capability, which limits its application in energy storage equipment. The precursor of NCM was modified with (Ni 0.4 Co 0.2 Mn 0.4 ) 1−x Zr x (OH) 2 by the co-precipitation. After high-temperature sintering, the diffusion of Zr 4+ has significant impacts on the stability and capability for NCM. The doped sample exhibits a capacity retention rate of 79.5% at 1 C after 200 cycles and also delivers excellent rate performance, and the average specific discharge capacity is 189.4 mAh g −1 (2 C) and 180.6 mAh g −1 (5 C), respectively.