In:
Angewandte Chemie, Wiley, Vol. 127, No. 14 ( 2015-03-27), p. 4399-4403
Abstract:
Despite the high theoretical capacity of lithium–sulfur batteries, their practical applications are severely hindered by a fast capacity decay, stemming from the dissolution and diffusion of lithium polysulfides in the electrolyte. A novel functional carbon composite (carbon‐nanotube‐interpenetrated mesoporous nitrogen‐doped carbon spheres, MNCS/CNT), which can strongly adsorb lithium polysulfides, is now reported to act as a sulfur host. The nitrogen functional groups of this composite enable the effective trapping of lithium polysulfides on electroactive sites within the cathode, leading to a much improved electrochemical performance (1200 mAh g −1 after 200 cycles). The enhancement in adsorption can be attributed to the chemical bonding of lithium ions by nitrogen functional groups in the MNCS/CNT framework. Furthermore, the micrometer‐sized spherical structure of the material yields a high areal capacity (ca. 6 mAh cm −2 ) with a high sulfur loading of approximately 5 mg cm −2 , which is ideal for practical applications of the lithium–sulfur batteries.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v127.14
DOI:
10.1002/ange.201411109
Language:
German
Publisher:
Wiley
Publication Date:
2015
detail.hit.zdb_id:
506609-8
detail.hit.zdb_id:
1479266-7
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