尖晶石
阴极
材料科学
晶体孪晶
离子
电化学
电极
锂(药物)
透射电子显微镜
边界(拓扑)
扩散
纳米技术
化学物理
光电子学
化学
复合材料
微观结构
热力学
冶金
物理化学
物理
数学分析
内分泌学
有机化学
医学
数学
作者
Rui Wang,Xin Chen,Zhongyuan Huang,Jinlong Yang,Fusheng Liu,Mihai Chu,Tongchao Liu,Chaoqi Wang,Weiming Zhu,Shuankui Li,Shunning Li,Jiaxin Zheng,Jie Chen,Lunhua He,Lei Jin,Feng Pan,Yinguo Xiao
标识
DOI:10.1038/s41467-021-23375-7
摘要
Abstract Defect engineering on electrode materials is considered an effective approach to improve the electrochemical performance of batteries since the presence of a variety of defects with different dimensions may promote ion diffusion and provide extra storage sites. However, manipulating defects and obtaining an in-depth understanding of their role in electrode materials remain challenging. Here, we deliberately introduce a considerable number of twin boundaries into spinel cathodes by adjusting the synthesis conditions. Through high-resolution scanning transmission electron microscopy and neutron diffraction, the detailed structures of the twin boundary defects are clarified, and the formation of twin boundary defects is attributed to agminated lithium atoms occupying the Mn sites around the twin boundary. In combination with electrochemical experiments and first-principles calculations, we demonstrate that the presence of twin boundaries in the spinel cathode enables fast lithium-ion diffusion, leading to excellent fast charging performance, namely, 75% and 58% capacity retention at 5 C and 10 C, respectively. These findings demonstrate a simple and effective approach for fabricating fast-charging cathodes through the use of defect engineering.
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