材料科学
纳米复合材料
锂(药物)
煅烧
化学工程
纳米颗粒
离子
原位聚合
聚合
阴极
纳米技术
复合材料
聚合物
有机化学
物理化学
催化作用
化学
工程类
医学
内分泌学
作者
Wang Hong-bin,Qianqian Wang,Lijia Liu,Shimei Jiang,Ling Ni,Xiaofei Bie,Xu Yang,Jiangtao Hu,Ziqi Wang,Haibiao Chen,Lei Zhu,Daliang Zhang,Yingjin Wei,Zongtao Zhang,Shilun Qiu,Feng Pan
出处
期刊:Nano Energy
[Elsevier]
日期:2017-09-01
卷期号:39: 346-354
被引量:57
标识
DOI:10.1016/j.nanoen.2017.07.001
摘要
Charging and discharging lithium ion batteries (LIBs) in a matter of seconds to tens of seconds rather than hours can potentially lead to technological breakthroughs and bring about lifestyle changes. This work aims to enable ultrafast Li-ions charge/discharge ability for LIBs by significantly accelerating the diffusion kinetics of Li+ ions and enhancing the electric conductivity in LiFePO4 cathode material. An innovative method was developed to synthesize LiFePO4/C nanocomposite with secondary particles structure containing uniform (20–50 nm) and highly crystalline LiFePO4 single nanoparticles which are free from any anti-site defects (e.g. Fe·Li) and uniformly coated by a highly graphitized carbon-shell network with good electronic conduction. The LiFePO4/C material was formed from a FePO4·xH2O/poly(furfuryl alcohol) nanocomposite, which was prepared through a self-regulated in situ polymerization restriction method, followed by a rapid wet-chemistry lithiation (H+/Li+ ion exchange) and subsequent calcination. Benefiting from the ultra-small size of the LiFePO4 nanoparticles, absence of Fe·Li defects, and a continuous 3D carbon network, the LiFePO4/C nanocomposite demonstrated ultrafast lithium-storage rates when used as a cathode material in lithium half-cells, which required only 21.6 s to reach a complete discharge at a rate of 150 C while still maintaining a high specific capacity of 95.4 mAh g−1.
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