Improvement of Electrochemical Performance of SnO2 Anode by Polypyrrole with Different Morphologies†

doi:10.7503/cjcu20131034

Abstract

Abstract:

SnO₂/polypyrrole composites as anode material of lithium ion batteries were in-situ prepared by an one-step precipitation in the suspension of the polypyrrole synthesized in advance. It is found that the morpho-logy of polypyrrole has an obvious effect on the electrochemical performance of SnO₂/polypyrrole composite anode. The granular polypyrrole(G-PPy) displayed advantages over the tubular polypyrrole. The composite containing G-PPy reached the first coulombic efficiency of 77.6% and remained a reversible specific capacity higher than 600 mA·h/g after 60 cycles. The good flexibility and adhesion of polypyrrole could make a contribution to the enhancement of the electrochemical performance of SnO₂ based anode.

Key words: SnO2/polypyrrole anode, Tubular polypyrrole, Globular polypyrrole, Lithium ion battery

CLC Number:

O646

TrendMD:

PENG Peng, WEN Zhaoyin, LIU Yu, YANG Jianhua. Improvement of Electrochemical Performance of SnO₂ Anode by Polypyrrole with Different Morphologies^†[J]. Chem. J. Chinese Universities, 2014, 35(5): 1051.

Figures/Tables 9

Fig.1 XRD patterns of SnO2/G-PPy(a), G-PPy(b), SnO2/T-PPy(c) and T-PPy(d)

Fig.2 SEM images of SnO2/G-PPy(A), G-PPy(B), SnO2/T-PPy(C) and T-PPy(D)

Fig.3 IR spectra of G-PPy(a), SnO2/G-PPy(b), T-PPy(c) and SnO2/T-PPy(d)

Fig.4 TG curves of T-PPy(a), G-PPy(b), SnO2/T-PPy(c) and SnO2/G-PPy(d)

Fig.5 Capacity vs. cycle number curves(A) and potential vs. capacity curves(B) of SnO2/PPy

Fig.6 Cyclic voltammogram of SnO2/G-PPy(A) and SnO2/T-PPy(B) anode in the coin cell

Fig.7 SEM images of the surface of SnO2/G-PPy(A, B) and SnO2/T-PPy(C, D) electrode before(A, C) and after 30 cycles(B, D) and SEM images of G-PPy(E) and T-PPy(F) electrode after 30 cycles

Scheme 1 Schematic illustration showing that SnO2/T-PPy slice tends to pulverize after Li+ cycling(A) while SnO2/G-PPy slice can buffer the large strain during Li+ cycling(B)

Fig.8 EIS spectra of SnO2/PPy anode^a. SnO2/G-PPy-start; b. SnO2/T-PPy-start; c. SnO2/G-PPy-10th cycles; d. SnO2/T-PPy-10th cycles.

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Improvement of Electrochemical Performance of SnO₂ Anode by Polypyrrole with Different Morphologies^†

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