A selenium@polypyrrole hollow sphere composite cathode delivers a reversible specific discharge capacity of 400 mA h g−1 after 80 cycles and a 60% reduction in impedance of the cycled cells is obtained. The soluble polyselenide species are demonstrated to be confined by PPy hollow spheres, thus inhibiting the shuttle effect to a large extent.
J. Guo, Z. Wen, G. Ma, J. Jin, W. Wang and Y. Liu, RSC Adv., 2015, 5, 20346 DOI: 10.1039/C4RA14945A
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