阴极
电化学
材料科学
兴奋剂
离子
热扩散率
无机化学
扩散
氟化物
化学
物理化学
电极
热力学
光电子学
有机化学
物理
作者
Sung-Beom Kim,Hyeona Kim,Deok‐Hye Park,Ji‐Hwan Kim,Jae‐Hoon Shin,Jae‐Sung Jang,Sangook Moon,Jinhyuk Choi,Kyung‐Won Park
标识
DOI:10.1016/j.jpowsour.2021.230219
摘要
Ni-rich cathode materials with high specific capacity of ~200 mAh g −1 are suitable for use in Li-ion batteries; however, the stability and cycling properties of these materials in batteries need to be improved. Herein, a solid-state reaction method is used to prepare the Ni-rich ternary cathode (NCM) materials doped with various amounts of F dopant. The F-doping and chemical states of the prepared cathode samples are characterized using X-ray photoelectron spectroscopy. Specifically, the diffusivity of Li + ions in the cathode samples is measured by various characterization methods. Compared to the undoped NCM sample, the F-doped cathode materials exhibit improved cycle performance owing to the strong bond of the transition metals and F and the improved Li + ion transport behavior. However, the F-doped NCM cathode with more than an optimal amount of F shows the deteriorated LIB performance owing to the deteriorated Li + ion transport caused by the Li/Ni antisite defects. • The F-doped Ni-rich ternary cathode materials were prepared. • The F-doped Ni-rich cathode exhibited improved electrochemical performance. • The improved performance is attributed to the strong bond of the metals and F. • The improved Li + ion diffusivity can result in enhanced LIB performance.
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