Mixed polyanion glass cathodes: Mixed alkali effect

A. K. Kercher, A. S. Chapel, J. A. Kolopus, L. A. Boatner

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

In lithium-ion batteries, mixed polyanion glass cathodes have demonstrated high capacities (200–500 mAh/g) by undergoing conversion and intercalation reactions. Mixed polyanion glasses typically have the same fundamental issues as other conversion cathodes, i.e.: large hysteresis, capacity fade, and 1st-cycle irreversible loss. A key advantage of glass cathodes is the ability to tailor their composition to optimize the desired physical properties and electrochemical performance. The strong dependence of glass physical properties (e.g., ionic diffusivity, electrical conductivity, and chemical durability) on the composition of alkali mixtures in a glass is well known and has been named the mixed alkali effect. The mixed alkali effect on battery electrochemical properties is reported here for the first time. Depending on glass composition, the mixed alkali effect is shown to improve capacity retention during cycling (from 39% to 50% after 50 cycle test), to reduce the 1st-cycle irreversible loss (from 41% to 22%), and improve the high power (500 mA/g) capacity (from 50% to 67% of slow discharge capacity).

Original languageEnglish
Pages (from-to)A2777-A2782
JournalJournal of the Electrochemical Society
Volume164
Issue number12
DOIs
StatePublished - 2017

Funding

Research has been supported by the 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. Shay Chapel’s work was funded through the Higher Education Research Experiences program, which was administered by the Oak Ridge Institute for Science & Education. Special thanks to: Nancy Dudney, Jagjit Nanda, Jim Kiggans, Joanne Ramey, Cliff Davisson, Ashli Clark, Michael Naguib, and Claus Daniel at Oak Ridge National Laboratory.

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