Ultrasmall Li2S nanoparticles anchored in graphene nanosheets for high-energy lithium-ion batteries

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題名:	Ultrasmall Li2S nanoparticles anchored in graphene nanosheets for high-energy lithium-ion batteries
作者:	鄭芳怡;Zhang, Kai;Wang, Lijiang;Hu, Zhe;Cheng, Fangyi;Chen, Jun
貢獻者:	地球科學學院大氣科學學系
關鍵詞:	140/133;147/135;147/143;639/638/161/891;639/925/357/354;Chemical reduction;Humanities and Social Sciences;Lithium;multidisciplinary;Nanocomposites;Nanoparticles;Science;Specific capacity;Sulfur;Thin films
日期:	2014-01-01
上傳時間:	2026-04-21 13:54:04 (UTC+8)
出版者:	Nature Publishing Group;London: Springer Science and Business Media LLC
摘要:	摘要： Li 2 S has a high theoretical capacity of 1166 mAh g −1 , but it suffers from limited rate and cycling performance. Herein we reported in-situ synthesis of thermally exfoliated graphene−Li 2 S (in-situ TG−Li 2 S) nanocomposite and its application as a superior cathode material alternative to sulfur. Li 2 S nanoparticles with the size of ~8.5 nm homogeneously anchored in graphene nanosheets were prepared via chemical reduction of pre-sublimed sulfur by lithium triethylborohydride (LiEt 3 BH). The in-situ TG−Li 2 S nanocomposite exhibited an initial capacity of 1119 mAh g −1 Li 2 S (1609 mAh g −1 S) with a negligible charged potential barrier in the first cycle. The discharge capacity retained 791 mAh g −1 Li 2 S (1137 mAh g −1 S) after 100 cycles at 0.1C and exceeded 560 mAh g −1 Li 2 S (805 mAh g −1 S) at a high rate of 2C. Moreover, coupling the composite with Si thin film anode, a Li 2 S/Si full cell was produced, delivering a high specific capacity of ~900 mAh g −1 Li 2 S (1294 mAh g −1 S). The outstanding electrode performance of in-situ TG−Li 2 S composite was attributed to the well dispersed small Li 2 S nanoparticles and highly conductive graphene nanosheets, which provided merits of facile ionic and electronic transport, efficient utilization of the active material and flexible accommodation of volume change. 其他題名： Sci Rep 出版者： London: Springer Science and Business Media LLC 出版日期： 2014-09-25 出處： Scientific Reports, 2014-09, Vol.4 (1), p.6467-, Article 6467 資源來源： Publicly Available Content Database (Proquest) 版權： The Author(s) 2014 版權： Copyright Nature Publishing Group Sep 2014 版權： Copyright © 2014, Macmillan Publishers Limited. All rights reserved 2014 Macmillan Publishers Limited. All rights reserved 識別號： ISSN: 2045-2322 識別號： EISSN: 2045-2322 識別號： DOI: 10.1038/srep06467 識別號： PMID: 25253198
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