Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (09): 1981-1988.doi: 10.3866/PKU.WHXB201306272

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Hierarchically Porous Carbon/DMcT/PEDOT-PSS Ternary Composite as a Cathode Material for Lithium-Ion Battery

CHI Ting-Yu, LI Han, WANG Geng-Chao   

  1. Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials, Science and Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China
  • Received:2013-04-12 Revised:2013-06-25 Published:2013-08-28
  • Contact: WANG Geng-Chao E-mail:gengchaow@ecust.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51173042), Innovation Program of Shanghai Municipal Education Commission, China (11ZZ55), and Fundamental Research Funds for the Central Universities, China.

Abstract:

Activated hierarchically porous carbon (aHPC) was fabricated by calcination, etching and KOH activation using phenol-formaldehyde resin (PF) as the carbon precursor and nano-CaCO3 dispersion as the double pore-forming agent. On this basis, the aHPC/2,5-dimercapto-1,3,4-thiadiazole (DMcT) composite was prepared through a solution immersion method using aHPC as the substrate, and poly(3,4-ethylenedioxythiophene)-poly(4-styrenesulfonate) (PEDOT-PSS) was coated subsequently onto the surface of aHPC/DMcT by in situ oxidative polymerization to prepare the aHPC/DMcT/PEDOT-PSS composite. The structure, morphology, and electrochemical properties of the composite were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and electrochemical measurements. The results showed that the amount of the functional groups in aHPC pores increased after HPC was activated by KOH, resulting in an enhancement (52%) of the adsorption of DMcT. Moreover, almost all of the DMcT was absorbed into the aHPC pores. It was found that the initial discharge capacity of the aHPC/DMcT composite was 236 mAh·g-1 and its specific capacity remained at 65 mAh·g-1 after 20 cycles. For comparison, with a surface coated with a layer of PEDOT-PSS conductive film, the initial discharge capacity of the aHPC/DMcT/PEDOT-PSS composite was up to 280 mAh·g-1 and it remained at 138 mAh·g-1 after 20 cycles (49.1% capacity retention).

Key words: 2,5-Dimercapto-1,3,4-thiadiazole, Poly(3,4-ethylenedioxythiophene)-poly (styrenesulfonate), Hierarchically porous carbon, Composite electrode materials, Lithium-ion battery

MSC2000: 

  • O646