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Surface Modified Pinecone Shaped Hierarchical Structure Fluorinated Mesocarbon Microbeads for Ultrafast Discharge and Improved Electrochemical Performances

Dai, Yang (<sup>a</sup>Department of Chemical Engineering, School of Environmental and Chemical, Engineering, Shanghai University, Shanghai 200444, People's Republic of China ) ; Fang, Yuan (<sup>a</sup>Department of Chemical Engineering, School of Environmental and Chemical, Engineering, Shanghai University, Shanghai 200444, People's Republic of China ) ; Cai, Sendan (<sup>a</sup>Department of Chemical Engineering, School of Environmental and Chemical, Engineering, Shanghai University, Shanghai 200444, People's Republic of China ) ; Wu, Lijun (<sup>b</sup>Condensed Matter Physics & Materials Science Department, Brookhaven National, Laboratory, Upton, New York 11973, USA ) ; Yang, Weijing (<sup>a</sup>Department of Chemical Engineering, School of Environmental and Chemical, Engineering, Shanghai University, Shanghai 200444, People's Republic of China ) ; Yan, Hao (<sup>a</sup>Department of Chemical Engineering, School of Environmental and Chemical, Engineering, Shanghai University, Shanghai 200444, People's Republic of China ) ; Xie, Jingying (<sup>a</sup>Department of Chemical Engi ) ; Zheng, Jin-Cheng ; Takeuchi, Esther ; Zhu, Yimei ;
  • 초록  

    Among all primary lithium batteries, Li/CF x primary battery possesses the highest energy density of 2180 Wh kg −1 . However, a key limitation is its poor rate capability because the cathode material CF x is intrinsically a poor electronic conductor. Here, we developed a so-called “doing subtraction” method to modify the pinecone shaped fluorinated mesocarbon microbead (F-MCMB). The modified fluorinated mesocarbon microbead (MF-MCMB), manifests the advantage of open-framed structure, possesses good electronic conductivity and removes transport barrier for lithium ions. Thus, high capacity performance and excellent rate capability without compromising capacity can be obtained. A capacity of 343 mAhg −1 and a maximum power density of 54600 W kg −1 are realized at an ultrafast rate of 40 C (28A g −1 ). In addition, the MF-MCMB cathode does not show any voltage delay even at 5C during the discharge, which is a remarkable improvement over the state-of-the-art CF x materials.


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