Enhanced cycle performance and synthesis of LiNi0.6Co0.2Mn0.2O2 single-crystal through the assist of Ba ion
Guorong Hu, Shuai Zhang, Ke Du, Zhongdong Peng, Jingyao Zeng, Zijun Fang, Luyu Li, Yinjia Zhang, Jiangnan Huang, Dichang Guan, Min Huang, Xu‐Dong Zhang, Yanbing Cao
Abstract
The single-crystal materials of Ni-based layered oxides have drawn in wide consideration due to excellent cycle performance and storage performance. However, the conditions for synthesizing Ni-based layered oxides with a single-crystal morphology are extremely demanding. In this research, Ba 2+ is introduced into the synthesis process of LiNi 0 . 6 Co 0 . 2 Mn 0 . 2 O 2 single-crystal material (SC-NCM) to assist the formation of single-crystal materials. Furthermore, this work proposes an inference that the introduction of Ba 2+ reduces the diffusion energy at the grain boundaries of the cathode particles, promoting particle coalescence. The role of Ba 2+ in this system is investigated using X-ray diffraction, scanning electron microscope , energy-dispersive x-ray spectroscopy, transmission electron microscopy , thermogravimetric analysis and differential thermal analysis . As a consequence, introducing Ba 2+ promotes the formation of single crystal morphology and improves the cycle performance of the cathode.