Tackling Polysulfide Problems in Li–S Batteries

  • Author: Liam Critchley
  • Published: 06 January 2020
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: ACS Nano/ACS Publications
  • Associated Societies: American Chemical Society (ACS), USA
thumbnail image: Tackling Polysulfide Problems in Li–S Batteries

Lithium–sulfur (Li–S) batteries are not as widely used as lithium-ion batteries, but they have a much higher theoretical energy density. The energy generation mechanism in Li–S batteries creates polysulfide ions that shuttle between the electrodes and react with the Li anode—the aptly named "polysulfide shuttle". This reduces the long-term efficiency of the batteries. This problem needs to be solved before Li–S batteries can be used on a large commercial scale.

Weidong He, Chunhui Yang, Harbin Institute of Technology, China, and colleagues have developed a glutamate electrolyte to be used in Li–S batteries. The team dissolved glutamate (pictured) in commonly used electrolytes, such as the lithium salt of bis(trifluoromethanesulfonyl) imide (LiTFSI). The negatively charged glutamate has a repulsive effect on polysulfides, which suppresses the shuttle effect.

The glutamate-containing electrolyte prevents the rapid capacity decay, self-discharge, and poor high-temperature performance that are usually caused by the shuttling of polysulfide ions. Li–S batteries with the improved electrolyte showed a capacity retention of 60 % after 1,000 cycles, a much lower self-discharge rate than that of conventional batteries, and stable operation at 60 °C.



Article Views: 3422

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission and consult our permission guidance prior to making your request

Follow on Facebook Follow on Twitter Follow on YouTube Follow on LinkedIn Follow on Instagram RSS Sign up for newsletters

Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH