| Title |
Alleviating the Polysulfide Shuttle Effect by Optimization of 3D Flower-Shaped Vanadium Dioxide for Lithium-Sulfur Batteries |
| Authors |
정수환(Su Hwan Jeong); 최현준(Hyeon-jun Choi); 이상준(Sang Jun Lee); 이동박(Dong Park Lee); 엄수윤(Suyoon Eum); 문산(San Moon); 윤종혁(Jong Hyuk Yun); 김주형(Joo-hyung Kim) |
| DOI |
https://doi.org/10.3365/KJMM.2023.61.11.849 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Lithium-Sulfur batteries; VO2; MWCNT; Melt diffusion |
| Abstract |
With the rapid development of portable devices and Energy Storage Systems (ESS), secondary batteries with high energy density and high capacity are in great demand. Among various candidates, Lithium-sulfur (Li-S) batteries have been considered for next-generation energy devices given their high theoretical capacity (1675 mAh g-1) and energy density (2500 Wh kg-1). However, the commercialization of Li- S batteries faces challenges due to sulfur’s low electrical conductivity and the shuttle effect, caused by the dissolution of lithium polysulfide intermediates in the electrolyte during the charge-discharge process. Herein, to resolve these problems, we report the fabrication of a vanadium dioxide (VO2) composite via a simple hydrothermal method and optimize the structure of VO2 for constructing an effective Multi-Walled Carbon Nano Tube (MWCNT) and 3D flower-shaped VO2 (MWCNT@VO2) binary sulfur host by a simple melt diffusion method. In particular, the polar VO2 composite not only physically absorbs the soluble lithium polysulfides but also has strong chemical bonds with a higher affinity for lithium polysulfides, which act as a catalyst, enhancing electrochemical reversibility. Additionally, MWCNT improves sulfur’s poor electrical conductivity and buffers volume expansion during cycling. The designed S-MWCNT@VO2 electrode also exhibits better capacity retention and cycling performance than a bare S-MWCNT electrode as a lithium polysulfide reservoir.(Received 12 July, 2023; Accepted 7 August, 2023) |