FeS@onion-like carbon nanocapsules embedded in amorphous carbon for the lithium ion batteries with excellent cycling stability

作者：Liu, Xianguo^*; Wu, Yunyi^*; Li, Xiaolong; Yu, Jieyi; Sun, Yuping

来源：Ceramics International, 2018, 44(12): 13654-13661.

DOI：10.1016/j.ceramint.2018.04.203

• Nanocomposites
• FeS
• Core-shell
• Lithium-ion batteries
• Synergistic effects

The development of lithium ion battery with long-term cycle stability is considered to be a prerequisite for commercialization. Onion-like carbon coated FeS nanocapsules embedded in amorphous carbon (FeS@OLC/a-C) is designed and one-step developed via discharging the Fe-C composite ingot under the atmosphere of Ar and H2S. In FeS@OLC/a-C nanocomposites, - 8.9 nm FeS@OLC nanocapsules with an average onion-like shell of 2 nm are covered by the amorphous carbon. The formation mechanism has been proposed for FeS@OLC/a-C nanocomposites. As the lithium ion battery anode candidate, FeS@OLC/a-C nanocomposite electrode have the advantages of good cycling stability (719.2 mAh g(-1) after being cycled at 0.1 A g(-1) for 200 times) and excellent high-rate performances (569.3 mAh g(-1) for 2 A g 540.9 mAh g for 4 A g(-1), 466.6 mAh g(-1) for 8 A g(-1) and 340.0 mAh g(-1) for 16 A g(-1)), which originates from the combined effect of small FeS nanoparticles, the onionlike carbon layers and amorphous carbon. The design idea in this paper provides a new approach for improving the cycling stability and rate capability of lithium ion battery.

• 出版日期2018-8-15
• 单位安徽工业大学; 北京有色金属研究总院; 杭州电子科技大学