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Title: A Shell-Shaped Carbon Architecture with High-Loading Capability for Lithium Sulfide Cathodes

We present that lithium sulfide (Li 2S) is considered a highly attractive cathode for establishing high-energy-density rechargeable batteries, especially due to its high charge-storage capacity and compatibility with lithium-metal-free anodes. Although various approaches have recently been pursued with Li 2S to obtain high performance, formidable challenges still remain with cell design (e.g., low Li 2S loading, insufficient Li 2S content, and an excess electrolyte) to realize high areal, gravimetric, and volumetric capacities. This study demonstrates a shell-shaped carbon architecture for holding pure Li 2S, offering innovation in cell-design parameters and gains in electrochemical characteristics. The Li 2S core–carbon shell electrode encapsulates the redox products within the conductive shell so as to facilitate facile accessibility to electrons and ions. The fast redox-reaction kinetics enables the cells to attain the highest Li 2S loading of 8 mg cm -2 and the lowest electrolyte/Li 2S ratio of 9/1, which is the best cell-design specifications ever reported with Li 2S cathodes so far. Lastly, benefiting from the excellent cell-design criterion, the core–shell cathodes exhibit stable cyclability from slow to fast cycle rates and, for the first time, simultaneously achieve superior performance metrics with areal, gravimetric, and volumetric capacities.
Authors:
 [1] ;  [1] ;  [1] ;  [1]
  1. Univ. of Texas, Austin, TX (United States). Materials Science and Engineering Program, Texas Materials Institute
Publication Date:
Grant/Contract Number:
EE0007218
Type:
Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Volume: 7; Journal Issue: 17; Journal ID: ISSN 1614-6832
Publisher:
Wiley
Research Org:
Univ. of Texas, Austin, TX (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 36 MATERIALS SCIENCE
OSTI Identifier:
1430177
Alternate Identifier(s):
OSTI ID: 1378808