Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 113, Issue 1, Pages 52-57Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1520394112
Keywords
hybrid electrolytes; inorganic sulfide glasses; fluorinated polymers; lithium batteries; lithium-sulfur batteries
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Funding
- Joint Center for Energy Storage Research, an Energy Innovation Hub - US Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES)
- US DOE, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- Office of Science, Office of BES, of the US DOE [DE-AC02-05CH11231]
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Despite high ionic conductivities, current inorganic solid electrolytes cannot be used in lithium batteries because of a lack of compliance and adhesion to active particles in battery electrodes as they are discharged and charged. We have successfully developed a compliant, nonflammable, hybrid single ion-conducting electrolyte comprising inorganic sulfide glass particles covalently bonded to a perfluoropolyether polymer. The hybrid with 23 wt% perfluoropolyether exhibits low shear modulus relative to neat glass electrolytes, ionic conductivity of 10(-4) S/cm at room temperature, a cation transference number close to unity, and an electrochemical stability window up to 5 V relative to Li+/Li. X-ray absorption spectroscopy indicates that the hybrid electrolyte limits lithium polysulfide dissolution and is, thus, ideally suited for Li-S cells. Our work opens a previously unidentified route for developing compliant solid electrolytes that will address the challenges of lithium batteries.
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