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

By Yongchun Li, Wei Xiang, Zhen-guo Wu, Chun-Liu Xu, Yadi Xu, Yao Xiao, Zu-guang Yang, Chunjin Wu, Genpin Lv, Xiao-dong Guo. Electrochimica Acta, 2018

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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.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/e84662ae0aa6c48f4a060b5fc1c7e62d6eb03c4e