Fishing-net-shaped cobalt oxide microspheres for effective polysulfide reservoirs of rechargeable Li-S battery cathodes
- Authors
- Kim, Jin Kyu; Park, Hyemin; Lee, Sun Sook; Son, Seung Uk; Kang, Yongku; Im, Won Bin; Choi, Sungho
- Issue Date
- Mar-2020
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Porous nanoparticle; Cobalt oxide; Sulfur reservoir; Cathode; Lithium-sulfur battery
- Citation
- MATERIALS CHEMISTRY AND PHYSICS, v.243, pp.1 - 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS CHEMISTRY AND PHYSICS
- Volume
- 243
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/10623
- DOI
- 10.1016/j.matchemphys.2019.122567
- ISSN
- 0254-0584
- Abstract
- Hole-embedded one-directional two-dimensional sheet-assembly cobalt oxide microspheres are synthesized and assessed as effective encapsulation media for polysulfides in cathodes of lithium-sulfur batteries. The cathode of fishing-net-shaped cobalt oxide compounds incorporated with sulfur provides exceptional electrochemical properties such as a high Coulombic efficiency (99%), stable capacity fading, and a reversible capacity of 925 mA h g(-1) at 1 C, which is 22% higher than that of the conventional nanoparticulate cobalt oxide/sulfur electrode. The enhanced electrochemical behavior is attributed to the effective polysulfide adsorbent and hierarchically designed porous cobalt oxide with a coaggregated framework. The controlled pore-embedded particle size is an essential parameter determining the capture of the mobile polysulfides, rather than the use of numerous mere highly porous encapsulants, such as nanoparticulate cobalt oxides.
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