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Title: Enhanced Surface Interactions Enable Fast Li + Conduction in Oxide/Polymer Composite Electrolyte

Journal Article · · Angewandte Chemie
ORCiD logo [1];  [2];  [3]; ORCiD logo [3]; ORCiD logo [3];  [3]; ORCiD logo [3];  [4];  [5];  [3]; ORCiD logo [3]
  1. Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science &, Engineering Beijing Institute of Technology Beijing 100081 P. R. China, Materials Science and Engineering Program and Texas Materials Institute The University of Texas at Austin Austin TX 78712 USA
  2. Center of Interdisciplinary Magnetic Resonance National High Magnetic Field Laboratory 1800 East Paul Dirac Drive Tallahassee FL 32310 USA
  3. Materials Science and Engineering Program and Texas Materials Institute The University of Texas at Austin Austin TX 78712 USA
  4. Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science &, Engineering Beijing Institute of Technology Beijing 100081 P. R. China
  5. Center of Interdisciplinary Magnetic Resonance National High Magnetic Field Laboratory 1800 East Paul Dirac Drive Tallahassee FL 32310 USA, Department of Chemistry and Biochemistry Florida State University Tallahassee FL 32306 USA

Abstract Li + ‐conducting oxides are considered better ceramic fillers than Li + ‐insulating oxides for improving Li + conductivity in composite polymer electrolytes owing to their ability to conduct Li + through the ceramic oxide as well as across the oxide/polymer interface. Here we use two Li + ‐insulating oxides (fluorite Gd 0.1 Ce 0.9 O 1.95 and perovskite La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 2.55 ) with a high concentration of oxygen vacancies to demonstrate two oxide/poly(ethylene oxide) (PEO)‐based polymer composite electrolytes, each with a Li + conductivity above 10 −4  S cm −1 at 30 °C. Li solid‐state NMR results show an increase in Li + ions (>10 %) occupying the more mobile A2 environment in the composite electrolytes. This increase in A2‐site occupancy originates from the strong interaction between the O 2− of Li‐salt anion and the surface oxygen vacancies of each oxide and contributes to the more facile Li + transport. All‐solid‐state Li‐metal cells with these composite electrolytes demonstrate a small interfacial resistance with good cycling performance at 35 °C.

Sponsoring Organization:
USDOE
Grant/Contract Number:
EE0007762
OSTI ID:
1593496
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 10 Vol. 132; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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