Si/polyaniline-based porous carbon composites with an enhanced electrochemical performance as anode materials for Li-ion batteries
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Silicon/polyaniline-based porous carbon (Si/PANI-AC) composites have been prepared by a three-step method: coating polyaniline on Si particles using in situ polymerization, carbonizing, and further activating by steam. The morphology and structure of Si/PANI-AC composites have been characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Raman spectra, respectively. The content and pore structure of the carbon coating layer in Si/PANI-AC have been measured by thermogravimetric analysis and N2 adsorption-desorption isotherm, respectively. The results indicate some micropores about 1~2 nm in the carbon layer appear during activation and that crystal structure and morphology of Si particles can be retained during preparation. Si/PANI-AC composites exhibit high discharge capacity about 1000 mAh g−1 at 1.5 A g−1; moreover, when the current density returns to 0.2 A g−1, the discharge capacity is still 1692 mAh g−1 and remains 1453 mAh g−1 after 70 cycles. The results indicate that the porous carbon coating layer in composites plays an important role in the improvement of the electrochemical performance of pure Si.
KeywordsSilicon/polyaniline-based porous carbon Composites Steam activation Electrochemical performance Li-ion batteries
The authors are grateful to the Fundamental Research Funds for the Central Universities (no. CQDXWL-2014-Z008) and the Chongqing Foundation and Advanced Research Projects (no. cstc2016jcyjA0462) for financial assistance.
- 3.Zhao Q, Xiao W, Yan X, Qin S, Qu B, Zhao L (2017) Effect of pyrolytic polyacrylonitrile on electrochemical performance of Si/graphite composite anode for lithium-ion batteries. Ionics:1–8Google Scholar
- 10.Hwang SM, Kim SY, Kim J-G, Kim KJ, Lee J-W, Park M-S, Kim Y-J, Shahabuddin M, Yamauchi Y, Kim JH (2015) Electrospun manganese-cobalt oxide hollow nanofibres synthesized via combustion reactions and their lithium storage performance. Nano 7:8351–8355Google Scholar
- 11.Wang W, Favors Z, Ionescu R, Ye R, Bay HH, Ozkan M, Ozkan CS (2015) Monodisperse porous silicon spheres as anode materials for lithium ion batteries. Sci Rep-Uk 5Google Scholar
- 36.S.Y. Chew, Z.P. Guo, J.Z. Wang, J. Chen, P. Munroe, S.H. Ng, L. Zhao, H.K. Liu (2007) Novel nano-silicon/polypyrrole composites for lithium storage, Electrochemistry Communications 9 ,941–946Google Scholar