材料科学
法拉第效率
表面改性
电化学
锂(药物)
阴极
电解质
化学工程
兴奋剂
扩散
氧化物
离子
锰
电极
化学
光电子学
有机化学
物理化学
物理
工程类
热力学
内分泌学
冶金
医学
作者
Haotian Dong,Danfeng Jiang,Shengzhou Xing,Lina Zhao,Lei Hu,Jing Mao,Haitao Zhang
出处
期刊:Small
[Wiley]
日期:2023-12-06
被引量:4
标识
DOI:10.1002/smll.202307156
摘要
Abstract Even lithium‐rich manganese oxides (LRMOs) are considered as promising cathode materials for next‐generation lithium‐ion batteries, their commercialization is hindered mainly by the low initial Coulombic efficiency, poor cyclability and unexpected capacity fade. Here, a synergistic modification strategy by using both F doping and weak organic acid surface treatment is proposed to improve the electrochemical performances of LRMOs significantly. Optimized Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 1.95 F 0.05 sample with surface oxygen vacancy defects and thin carbon coating layer exhibits profound electrochemical performances, for example, discharging capacities of 298.6 and 212.5 mAh g −1 at 0.1 C and 1 C rate, respectively. In addition, it can own an initial Coulombic efficiency of 84.4%, which is much higher than that of untreated sample. In situ X‐ray diffraction analysis implies that synergistic modification can enhance the skeleton stability of LRMOs , especially at a high state of charge. Galvanostatic intermittent titration technique analysis suggests that as‐developed synergistic modification can accelerate the lithium ions diffusion. Theoretical calculations reveal that substituted F and oxygen vacancy defects can diminish the diffusion energy barrier of Li + ions. This work provides a new synergistic modification strategy to improve the comprehensive properties of LRMO cathode effectively.
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