Issue 41, 2014

Enhancement of long stability of Li–S battery by thin wall hollow spherical structured polypyrrole based sulfur cathode

Abstract

To enhance the long stability of sulfur cathode for a high-energy lithium–sulfur cell, a thin wall hollow spherical structured polypyrrole (T-HSSP) composed of a mono layer of PPy nano-particles is employed as a host to encapsulate the sulfur component. T-HSSP can buffer the volume expansion of sulfur during the discharge and charge processes; therefore can maintain the integrity of the sulfur electrode after long cycling. The distribution of sulfur component is maintained even after 100 charge/discharge cycles in T-HSSP, indicating the efficiency of the design in inhibiting the shuttle effect of the sulfur electrode. The composite with a sulfur content of 58.4 wt% exhibits a reversible capacity of 1563.3 mA h g−1 and a discharge capacity retention over 89% during 40–200 cycles, corresponding to a sulfur utilization rate of 89.2% at 0.2 C. The excellent rate capability of the composite is demonstrated by its cycling performances at 1 C, 2 C, and 5 C for 300 cycles. Moreover, a further heating treatment is carried out to inhibit the severe capacity fade in the initial tens of cycles, and an enhanced cycling stability of the Li–S battery is achieved.

Graphical abstract: Enhancement of long stability of Li–S battery by thin wall hollow spherical structured polypyrrole based sulfur cathode

Supplementary files

Article information

Article type
Paper
Submitted
17 Mar 2014
Accepted
25 Apr 2014
First published
25 Apr 2014

RSC Adv., 2014,4, 21612-21618

Author version available

Enhancement of long stability of Li–S battery by thin wall hollow spherical structured polypyrrole based sulfur cathode

G. Ma, Z. Wen, J. Jin, Y. Lu, X. Wu, C. Liu and C. Chen, RSC Adv., 2014, 4, 21612 DOI: 10.1039/C4RA02306D

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