electrolyte,
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, the polysulfides shuttle to the anode and react with it,
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, forming a film that renders the battery useless within a few dozen cycles — or one to two months of use.
At Sandia National Laboratories in Albuquerque,
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, N.M.,
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, a team led by Kevin Zavadil is trying to block the formation of polysulfides in the electrolyte. The electrolyte consists of salt and a solvent,
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, and current lithium-sulfur batteries require a large amount of electrolyte to achieve a moderate life span. Zavadil and his team are developing “lean” electrolyte mixtures less likely to dissolve the sulfur molecules that create polysulfides.
Described September 9 in ACS Energy Letters,
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, the new electrolyte mix contains a higher-than-usual salt concentration and a “sparing” amount of solvent. The researchers also reduced the overall amount of electrolyte in the batteries. In test runs,
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, the tweaks dropped the concentration of polysulfides by several orders of magnitude,
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, Zavadil says.
“We [also] have some ideas on how to use membranes to protect the lithium surface to prevent polysulfides from happening in the

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