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LiFePO4quantum-dots composite synthesized by a general microreactor strategy for ultra-high-rate lithium ion batteries

Journal Article


Abstract


  • Due to the relatively slow, diffusion-controlled faradaic reaction mechanisms of conventional LiFePO 4 (LFP) materials, which is hard to deliver satisfied capacity for high rate applications. In this work, ultrafine LFP quantum dots (LFP-QDs) co-modified by two types of carbonaceous materials - amorphous carbon and graphitized conductive carbon (graphene) have been successfully synthesized through a novel microreactor strategy. Because of the very limited area constructed by the dual-carbon microreactor for the growth of LFP crystal, it's demension was furthest suppressed to a very small level (∼ 6.5nm). Such a designed nano-composite possesses a large specific surface area for charge adsorption and abundant active sites for faradaic reactions, as well as ideal kinetic features for both electron and ion transport, and thus exhibits ultra-fast, surface-reaction-controlled lithium storage behavior, mimicking the pseudocapacitive mechanisms for supercapacitor materials, in terms of extraordinary rate capability (78mAhg -1 at 200C) and remarkable cycling stability (∼ 99% over 1000 cycles at 20C). On the other side, due to the quasi-2D structure of the synthesized LFP-QDs composite, which can be used as the basic unit to further fabricate free-standing film, aerogel and fiber electrode without the addition of binder and conductive agent for different practical applications. In addition, to deeper understand its electrochemical behavior, a combined experimental and density functional theoretical (DFT) calculation study is also introduced.

Authors


  •   Wang, Bo (external author)
  •   Xie, Ying (external author)
  •   Liu, Tong (external author)
  •   Luo, Hao (external author)
  •   Wang, Bin (external author)
  •   Wang, Chunhui (external author)
  •   Wang, Lei
  •   Wang, Dianlong (external author)
  •   Dou, Shi Xue
  •   Zhou, Yu (external author)

Publication Date


  • 2017

Citation


  • Wang, B., Xie, Y., Liu, T., Luo, H., Wang, B., Wang, C., Wang, L., Wang, D., Dou, S. & Zhou, Y. (2017). LiFePO4quantum-dots composite synthesized by a general microreactor strategy for ultra-high-rate lithium ion batteries. Nano Energy, 42 (December), 363-372.

Scopus Eid


  • 2-s2.0-85035002355

Number Of Pages


  • 9

Start Page


  • 363

End Page


  • 372

Volume


  • 42

Issue


  • December

Place Of Publication


  • Netherlands

Abstract


  • Due to the relatively slow, diffusion-controlled faradaic reaction mechanisms of conventional LiFePO 4 (LFP) materials, which is hard to deliver satisfied capacity for high rate applications. In this work, ultrafine LFP quantum dots (LFP-QDs) co-modified by two types of carbonaceous materials - amorphous carbon and graphitized conductive carbon (graphene) have been successfully synthesized through a novel microreactor strategy. Because of the very limited area constructed by the dual-carbon microreactor for the growth of LFP crystal, it's demension was furthest suppressed to a very small level (∼ 6.5nm). Such a designed nano-composite possesses a large specific surface area for charge adsorption and abundant active sites for faradaic reactions, as well as ideal kinetic features for both electron and ion transport, and thus exhibits ultra-fast, surface-reaction-controlled lithium storage behavior, mimicking the pseudocapacitive mechanisms for supercapacitor materials, in terms of extraordinary rate capability (78mAhg -1 at 200C) and remarkable cycling stability (∼ 99% over 1000 cycles at 20C). On the other side, due to the quasi-2D structure of the synthesized LFP-QDs composite, which can be used as the basic unit to further fabricate free-standing film, aerogel and fiber electrode without the addition of binder and conductive agent for different practical applications. In addition, to deeper understand its electrochemical behavior, a combined experimental and density functional theoretical (DFT) calculation study is also introduced.

Authors


  •   Wang, Bo (external author)
  •   Xie, Ying (external author)
  •   Liu, Tong (external author)
  •   Luo, Hao (external author)
  •   Wang, Bin (external author)
  •   Wang, Chunhui (external author)
  •   Wang, Lei
  •   Wang, Dianlong (external author)
  •   Dou, Shi Xue
  •   Zhou, Yu (external author)

Publication Date


  • 2017

Citation


  • Wang, B., Xie, Y., Liu, T., Luo, H., Wang, B., Wang, C., Wang, L., Wang, D., Dou, S. & Zhou, Y. (2017). LiFePO4quantum-dots composite synthesized by a general microreactor strategy for ultra-high-rate lithium ion batteries. Nano Energy, 42 (December), 363-372.

Scopus Eid


  • 2-s2.0-85035002355

Number Of Pages


  • 9

Start Page


  • 363

End Page


  • 372

Volume


  • 42

Issue


  • December

Place Of Publication


  • Netherlands