skip to main content

DOE PAGESDOE PAGES

Title: Investigation of the Li–S Battery Mechanism by Real-Time Monitoring of the Changes of Sulfur and Polysulfide Species during the Discharge and Charge

The mechanism of the sulfur cathode in Li-S batteries has been proposed. It was revealed by the real-time quantitative determination of polysulfide species and elemental sulfur by means of the high performance liquid chromatography in the course of the discharge and recharge of a Li-S battery. A three-step reduction mechanism including two chemical equilibrium reactions was proposed for the sulfur cathode discharge. The typical two-plateau discharge curve for sulfur cathode can be explained. A two-step oxidation mechanism for the Li 2S and Li 2S 2 with a single chemical equilibrium among soluble polysulfide ions was proposed. In conclusion, the chemical equilibrium among S 5 2-, S 6 2-, S 7 2- and S 8 2- throughout the entire oxidation process resulted for the single flat recharge curve in Li-S batteries.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [3] ;  [4] ;  [1]
  1. Univ. of Wisconsin, Milwaukee, WI (United States). Dept. of Mechanical Engineering
  2. Wuhan Univ. of Technology, Wuhan (China). Dept. of Chemistry, School of Science
  3. Wuhan Univ. of Technology, Wuhan (China). Dept. of Chemistry, School of Science
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Chemistry
Publication Date:
Report Number(s):
BNL-113427-2017-JA
Journal ID: ISSN 1944-8244; VT1201000; TRN: US1701649
Grant/Contract Number:
SC0012704; WUT 2015-IB-001
Type:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 9; Journal Issue: 5; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (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; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1342633