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Synergistic protective effect of a BN-carbon separator for highly stable lithium sulfur batteries

Title
Synergistic protective effect of a BN-carbon separator for highly stable lithium sulfur batteries
Author
백운규
Keywords
LI-S BATTERIES; POLYSULFIDE SHUTTLE; CYCLE PERFORMANCE; METAL ANODES; CATHODES; INTERLAYER; MEMBRANE
Issue Date
2017-04
Publisher
NATURE PUBLISHING GROUP
Citation
NPG ASIA MATERIALS, v. 9, Article no. e375
Abstract
Lithium sulfur (Li-S) batteries have drawn much attention as next-generation batteries because of their high theoretical capacity (1672 mAh g(-1)), environmental friendliness and low cost. However, several critical issues, which are mainly associated with the polysulfide shuttling effect, result in their poor electrochemical performance. Carbon-modified separators have been introduced to attempt to address these systemic challenges. However, this approach focused only on the suppression of dissolved polysulfides on the cathodic side without considering the further entrapment of polysulfides on the anodic side. In this study, we first designed a multifunctional trilayer membrane comprising a carbon layer and a boron nitride (BN) layer to facilitate the electrochemical performance of Li-S batteries and protect the Li anode from unexpected side reactions. When a BN-carbon separator was employed, the sulfur cathode delivered stable capacity retention over 250 cycles and an excellent specific capacity (702 mAh g(-1)) at a high current density (4 C). The BN-carbon separator also facilitated the uniform plating/striping of Li and, thus, suppressed the severe growth of dendritic Li on the electrode; this led to the stable operation of the Li anode with a high Coulombic efficiency and improved cycling performance.
URI
https://www.nature.com/articles/am201751http://repository.hanyang.ac.kr/handle/20.500.11754/113699
ISSN
1884-4049; 1884-4057
DOI
10.1038/am.2017.51
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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