1. CNTs-intertwined and N-doped porous carbon wrapped silicon anode for high performance lithium-ion batteries.
- Author
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Qiu, Yiwei, Zhang, Chenying, Zhang, Chengkun, Xie, Qingshui, Qiao, Zhensong, Zeng, Xiangzhe, Xu, Wanjie, Zheng, Hongfei, Li, Shuai, Lin, Jie, and Peng, Dong-Liang
- Subjects
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ELECTRIC conductivity , *LITHIUM-ion batteries , *ANODES , *GRAPHITIZATION , *SILICON nanowires , *CHEMICAL stability , *CARBON - Abstract
• CNTs and N-doped carbon decoration can enhance electronic conductivity of Si-based anode. • CoSi 2 can improve the structural stability of Si-based anode. • The introduced Co can catalyze the graphitization of carbon shell. • The designed Si-based anode delivers enhanced electrochemical properties. [Display omitted] Silicon is evaluated as a competitive lithium-ion batteries anode material by virtue of its ultrahigh specific capacity and relatively low discharge potential. However, the large volume change during lithiation/delithiation processes, and the low intrinsic electric conductivity have seriously impeded its widespread practical application. Herein, silicon nanoparticles (SiNPs) coated with CNTs-intertwined N-doped porous carbon (NPC) are prepared via a facile solution-phase method, followed by thermal annealing treatment. In this hierarchical structure, the bimetallic ZIF-derived porous carbon can shorten the migration channels of Li+ and electrons. Moreover, the formed Co nanoparticles can not only catalyze the graphitization of carbon, but also propel in-situ growth of CNTs to constitute a 3D interconnected conductive network, thereby improving the electrochemical performance. Benefiting from the unique structure, the as-prepared Si@CoSi 2 /Co-NPC@CNTs electrode exhibits superior electrochemical performance of 1191 mAh g−1 at 0.5 A g−1 after 200 cycles. Meanwhile, the electrode also shows excellent rate capability of 930 mAh g−1 even at a high current density of 6 A g−1. This work provides a new strategy to design exceptionally high electrical conductivity and structure stability of Si-based anode materials. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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