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Tungsten Oxide/Zirconia as a Functional Polysulfide Mediator for High-Performance Lithium–Sulfur Batteries

Title
Tungsten Oxide/Zirconia as a Functional Polysulfide Mediator for High-Performance Lithium–Sulfur Batteries
Author
황장연
Keywords
COMPOSITES; CATHODE; LI2S; CATALYSTS; WO3-ZRO2; SURFACE; WO3
Issue Date
2020-10
Publisher
AMER CHEMICAL SOC
Citation
ACS ENERGY LETTERS, v. 5, no. 10, page. 3168-3175
Abstract
In this study, an effective strategy is proposed to overcome the limitations associated with the use of a Li,S cathode in lithium-sulfur (Li-S) batteries. Herein, tungsten oxide/zirconia (WO3/ZrO2) with a ratio of 3:7 is prepared and incorporated into a 2D compacted Li2S-graphene matrix through pelletization. The proposed composite material shows a great potential as cathode material for Li-S batteries. In the composite cathode, the high electrical conductivity of graphene and presence of a metastable high-pressure Li2S phase allows the direct conversion of Li2S to S (8) during the first activation process, and simultaneously the incorporated tungsten oxide/zirconia particles act as a polysulfide mediator to block the outflow of soluble polysulfide into the electrolyte solution. Therefore, the composite cathode shows high interfacial stability and thus substantially 40 extends the lifetime of the Li-S battery over 200 cycles at a high Li,S loading of 10 mg cm(-2). The practical Li-S full battery fabricated by combining the composite cathode and graphite anode provides reliable cycling stability over 1500 cycles.
URI
https://pubs.acs.org/doi/10.1021/acsenergylett.0c01511https://repository.hanyang.ac.kr/handle/20.500.11754/171873
ISSN
2380-8195
DOI
10.1021/acsenergylett.0c01511
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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