钝化
锂(药物)
离子
材料科学
储能
纳米技术
电极
纳米晶
阴极
粒子(生态学)
电池(电)
化学工程
化学物理
化学
物理化学
热力学
图层(电子)
有机化学
功率(物理)
内分泌学
工程类
地质学
物理
海洋学
医学
作者
Yandong Duan,Bingkai Zhang,Jiaxin Zheng,Jiangtao Hu,Jianguo Wen,Dean J. Miller,Pengfei Yan,Tongchao Liu,Hua Guo,Wen Li,Xiaohe Song,Zengqing Zhuo,Chaokun Liu,Haoyu Tang,Rui Tan,Zonghai Chen,Yang Ren,Yuan Lin,Wanli Yang,Chongmin Wang,Lin‐Wang Wang,Jun Lü,Khalil Amine
出处
期刊:Nano Letters
[American Chemical Society]
日期:2017-09-20
卷期号:17 (10): 6018-6026
被引量:50
标识
DOI:10.1021/acs.nanolett.7b02315
摘要
Because of their enhanced kinetic properties, nanocrystallites have received much attention as potential electrode materials for energy storage. However, because of the large specific surface areas of nanocrystallites, they usually suffer from decreased energy density, cycling stability, and effective electrode capacity. In this work, we report a size-dependent excess capacity beyond theoretical value (170 mA h g–1) by introducing extra lithium storage at the reconstructed surface in nanosized LiFePO4 (LFP) cathode materials (186 and 207 mA h g–1 in samples with mean particle sizes of 83 and 42 nm, respectively). Moreover, this LFP composite also shows excellent cycling stability and high rate performance. Our multimodal experimental characterizations and ab initio calculations reveal that the surface extra lithium storage is mainly attributed to the charge passivation of Fe by the surface C–O–Fe bonds, which can enhance binding energy for surface lithium by compensating surface Fe truncated symmetry to create two types of extra positions for Li-ion storage at the reconstructed surfaces. Such surface reconstruction nanotechnology for excess Li-ion storage makes full use of the large specific surface area of the nanocrystallites, which can maintain the fast Li-ion transport and greatly enhance the capacity. This discovery and nanotechnology can be used for the design of high-capacity and efficient lithium ion batteries.
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