The alloy-type material Sb is widely used in the anode materials of lithium-ion batteries(LIBs)due to its high theoretical specific capacity.However,its serious volume expansion problem during alloying/dealloying of Li+limits its practical application.In this work,C-Sb composite was constructed as anode material of LIBs by electrospinning route for the first time,Sb was introduced into the polyacrylonitrile-based hard carbon and coal tar pitch-based soft carbon composite amorphous carbon fiber with a diameter of 300-600 nm,which realized high cycling stability.The C-Sb-2(the mass ratio of polyacry-lonitrile to Sb source is 1∶2)electrode displayed charge capacities of 1098.5,930.3,841.7,753.5,643.9 and 545.8 mAh·g-1 at 0.1,0.2,0.3,0.5,1 and 2 A·g-1,respectively.And when the current density returned to 0.1 A·g-1,the charge capacity was 939.3 mAh·g-1,revealing good stability and reversibility.The introduction of Sb into the amorphous carbon improved its conductivity and addressed the volume expansion issue of high specific capacity Sb during charge/discharge.Ex-situ XRD analysis confirmed the high reversibility of the C-Sb-2 during charging and discharging.Density functional theory(DFT)calculations revealed the gradual enhancement of the interface inter-action between SbxLiy and amorphous carbon(AMC)with increasing lithium content,contributing to the anchoring of alloy nanoparticles on the AMC surface and buffering the volume change of the alloy.Moreover,the gradual lithia-tion of Sb facilitated the electron transfer from SbxLiy to AMC.These findings hold promise for designing lithium storage materials with exceptional performance,high-lighting the potential of C-Sb composites as anode mate-rials for efficient next-generation lithium storage.
Ying Li、Yi-Han Zhao、Lu-Lu Zhao、Peng-Fei Wang、Ying Xie、Ting-Feng Yi
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School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China
Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province,School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China
Key Laboratory of Functional Inorganic Material Chemistry,Ministry of Education,School of Chemistry and Materials Science,Heilongjiang University,Harbin 150080,China
National Natural Science Foundation of ChinaNatural Science Foundation of Hebei ProvinceScience and Technology Research Youth Fund Project of Higher Education Institutions of Hebei ProvinceFundamental Research Funds for the Central UniversitiesNatural Science Foundation of Hebei Province of China
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