Iron vacancies and surface modulation of iron disulfide nanoflowers as a high power/energy density cathode for ultralong-life stable Li storage
文献类型： 外文期刊
作者： Xi, Yonglan 1 ; Ye, Xiaomei 1 ; Duan, Shaorong 4 ; Li, Tie 2 ; Zhang, Jing 5 ; Jia, Lujie 4 ; Yang, Jin 2 ; Wang, Jian 2 ; L 1 ;
作者机构： 1.Jiangsu Acad Agr Sci, Recycling Agr Res Ctr, Nanjing 210014, Peoples R China
2.Chinese Acad Sci, Suzhou Inst Nanotech & Nanobion, I Lab, Suzhou 215123, Peoples R China
3.Inst Appl Phys & Computat Math, Lab Computat Phys, Beijing 100088, Peoples R China
4.Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Dept Phys, Beijing 100084, Peoples R China
5.Xian Univ Technol, Sch Mat Sci & Engn, Xian 710048, Peoples R China
期刊名称：JOURNAL OF MATERIALS CHEMISTRY A （ 影响因子：12.732； 五年影响因子：11.995 ）
ISSN： 2050-7488
年卷期： 2020 年 8 卷 29 期
页码：
收录情况： SCI
摘要： Iron disulfide-based cathodes have been regarded as promising for use in high-energy-density lithium batteries owing to their low cost. However, low utilization, sluggish lithium ion insertion kinetics and rapid capacity fading prevent their practical application. Herein, defect-rich iron disulfide nanoflowers are synthesized by self-assembly on a hierarchical porous catalytic heteroatom-doped carbon matrix. Both electrochemical experiments and density functional theory simulations reveal that the iron defects in the cathode help to decrease the diffusion barrier so that lithium ions can freely and easily insert into the crystal and improve the transport kinetics. Meanwhile, the hierarchical porous structure also accommodates volumetric changes and facilitates electrolyte immersion. As a consequence, the as-prepared cathode delivers an initial specific capacity of 841 mA h g(-1)at 0.1C and retains an energy density of similar to 500 W h kg(-1)at a high power density of 26.7 kW kg(-1)(20C). Even working for 3000 cycles at 4C, the cell can still preserve an energy efficiency of above 95% and display a high energy density of 220 W h kg(-1)with an average capacity fading as low as 0.020% per cycle, showing its superior electrochemical stability and lifetime.
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