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Title: Solvent effects on polysulfide redox kinetics and ionic conductivity in lithium-sulfur batteries

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.1181614jes· OSTI ID:1348933
 [1];  [1];  [2];  [3];  [4];  [3];  [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. California State Univ. (CalState), Northridge, CA (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. 24M Technologies, Cambridge, MA (United States)

Lithium-sulfur (Li-S) batteries have high theoretical energy density and low raw materials cost compared to present lithium-ion batteries and are thus promising for use in electric transportation and other applications. A major obstacle for Li-S batteries is low rate capability, especially at the low electrolyte/sulfur (E/S) ratios required for high energy density. Herein, we investigate several potentially rate-limiting factors for Li-S batteries. We study the ionic conductivity of lithium polysulfide solutions of varying concentration and in different ether-based solvents and their exchange current density on glassy carbon working electrodes. We believe this is the first such investigation of exchange current density for lithium polysulfide in solution. Exchange current densities are measured using both electrochemical impedance spectroscopy and steady-state galvanostatic polarization. In the range of interest (1-8 M [S]), the ionic conductivity monotonically decreases with increasing sulfur concentration while exchange current density shows a more complicated relationship to sulfur concentration. The electrolyte solvent dramatically affects ionic conductivity and exchange current density. Finally, the measured ionic conductivities and exchange current densities are also used to interpret the overpotential and rate capability of polysulfide-nanocarbon suspensions; this analysis demonstrates that ionic conductivity is the rate-limiting property in the solution regime (i.e. between Li2S8 and Li2S4).

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Materials Sciences and Engineering Division; Joint Center for Energy Storage Research (JCESR)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1348933
Journal Information:
Journal of the Electrochemical Society, Vol. 163, Issue 14; ISSN 0013-4651
Publisher:
The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 53 works
Citation information provided by
Web of Science

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Cited By (15)

Toward Better Lithium–Sulfur Batteries: Functional Non-aqueous Liquid Electrolytes journal August 2018
Revisiting the Role of Polysulfides in Lithium-Sulfur Batteries journal March 2018
Rational Design of Nanostructured Functional Interlayer/Separator for Advanced Li-S Batteries journal February 2018
Cell Concepts of Metal–Sulfur Batteries (Metal = Li, Na, K, Mg): Strategies for Using Sulfur in Energy Storage Applications journal September 2017
Current Status and Future Prospects of Metal–Sulfur Batteries journal May 2019
A Bifunctional Perovskite Promoter for Polysulfide Regulation toward Stable Lithium-Sulfur Batteries journal November 2017
Mesoscale Physicochemical Interactions in Lithium–Sulfur Batteries: Progress and Perspective journal October 2017
Intercalation-conversion hybrid cathodes enabling Li–S full-cell architectures with jointly superior gravimetric and volumetric energy densities journal March 2019
Factors of Kinetics Processes in Lithium–Sulfur Reactions journal December 2019
Revisiting the positive roles of liquid polysulfides in alkali metal–sulfur electrochemistry: from electrolyte additives to active catholyte journal January 2019
Electrodeposition Kinetics in Li-S Batteries: Effects of Low Electrolyte/Sulfur Ratios and Deposition Surface Composition journal January 2017
Single-particle measurements of electrochemical kinetics in NMC and NCA cathodes for Li-ion batteries journal January 2018
A Toolbox for Lithium-Sulfur Battery Research: Methods and Protocols journal June 2017
Factors of Kinetics Processes in Lithium–Sulfur Reactions journal May 2019
Structural and Transport Properties of Li/S Battery Electrolytes: Role of the Polysulfide Species journal April 2019

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