期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 104, 期 -, 页码 88-97出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2021.06.054
关键词
Tin submicron spheres; Nitrogen-doped porous carbon; Self-formed template; In-situ XRD; Li-ion batteries
资金
- China Postdoctoral Science Foundation [2020M670719]
- Doctoral Research Startup Fund of Liaoning Province [2020-BS-0 6 6]
- Fundamental Research Funds for the Central Universities [3132019328]
A facile and eco-friendly method is reported to synthesize tin submicron spheres dispersed in nitrogen-doped porous carbon by pyrolysis, inhibiting the agglomeration of tin-based nanomaterials and simplifying the synthesis process. The self-formed Na2CO3 templates during pyrolysis support the formation of nitrogen-doped porous carbon, which provides good electronic conductivity and ample active sites. The Sn/NPC electrode exhibits excellent electrochemical performance as an anode for Li-ion batteries.
To inhibit the agglomeration of tin-based nanomaterials and simplify the complicated synthesis process, a facile and eco-friendly self-formed template method is reported to synthesize tin submicron spheres dispersed in nitrogen-doped porous carbon (Sn/NPC) by pyrolysis of a mixture of disodium stannous citrate and urea. The vital point of this strategy is the formation of Na2CO3 templates during pyrolysis. This self-formed Na2CO3 acts as porous templates to support the formation of NPC. The obtained NPC provides good electronic conductivity, ample defects, and more active sites. Serving as anode for Li-ion batteries, the Sn/NPC electrode obtains a stable discharge capacity of 674.1 mAh/g after 150 cycles at 0.1 A/g. Especially, a high discharge capacity of 331.2 mAh/g can be achieved after 1100 cycles at 3 A/g. Additionally, a full cell coupled with LiCoO2 as cathode yields a discharge capacity of 524.8 mAh/g after 150 cycles at 0.1 A/g. In-situ XRD is implemented to investigate the alloying/dealloying reaction mechanisms. Density functional theory calculation ulteriorly explicates that NPC heightens intrinsic electronic conductivity, and NPC especially pyrrolic-N and pyridinic-N doping facilitates the Li-adsorption ability. Climbing image nudged elastic band method reveals low Li+ diffusion energy barrier in presence of N atoms, which accounts for the terrific electrochemical properties of Sn/NPC electrode. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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