4.8 Article

A New Type of Electrolyte System To Suppress Polysulfide Dissolution for Lithium Sulfur Battery

Journal

ACS NANO
Volume 13, Issue 8, Pages 9067-9073

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b03304

Keywords

lithium-sulfur battery; lithium polysulfide; solid-electrolyte interphase (SEI); electrolyte system; battery cycle life

Funding

  1. National Natural Science Foundations of China [51872193, 21703149, 51622208]
  2. Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
  3. Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U.S. Department of Energy, through the Advanced Battery Materials Research (BMR) Program (Battery500 Consortium) [DE-EE0007762]

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Lithium-sulfur (Li-S) batteries have been explored extensively for high-capacity electric-power storage, but their practical application has been prevented by severe issues stemming from the use of a lithium anode and an organic-liquid electrolyte in which Li2Sx intermediates of the cell discharge reaction are soluble and shuttle to the anode. Both problems are addressed using bis(4-nitrophenyl) carbonate as an additive in the organic-liquid electrolyte. The soluble Li2Sx polysulfides react with the additive to create insoluble polysulfides with a lithium byproduct; this byproduct reacts with the Li-metal anode to create an anode passivation layer that is a good Li+ conductor, which allows for safe and rapid plating/stripping of lithium metal with a low impedance.

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