Document Type

Article

Publication Date

1-2016

Publication Source

Journal of Power Sources

Abstract

A three-layered (ceramic-polymer-ceramic) hybrid separator was prepared by coating ceramic electrolyte [lithium aluminum germanium phosphate (LAGP)] over both sides of polyethylene (PE) polymer membrane using electron beam physical vapor deposition (EB-PVD) technique. Ionic conductivities of membranes were evaluated after soaking PE and LAGP/PE/LAGP membranes in a 1 Molar (1M) lithium hexafluroarsenate (LiAsF6) electrolyte in ethylene carbonate (EC), dimethyl carbonate (DMC) and ethylmethyl carbonate (EMC) in volume ratio (1:1:1). Scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques were employed to evaluate morphology and structure of the separators before and after cycling performance tests to better understand structure-property correlation. As compared to regular PE separator, LAGP/PE/LAGP hybrid separator showed: (i) higher liquid electrolyte uptake, (ii) higher ionic conductivity, (iii) lower interfacial resistance with lithium and (iv) lower cell voltage polarization during lithium cycling at high current density of 1.3 mA cm−2 at room temperature. The enhanced performance is attributed to higher liquid uptake, LAGP-assisted faster ion conduction and dendrite prevention. Optimization of density and thickness of LAGP layer on PE or other membranes through manipulation of PVD deposition parameters will enable practical applications of this novel hybrid separator in rechargeable lithium batteries with high energy, high power, longer cycle life, and higher safety level.

Inclusive pages

194-198

ISBN/ISSN

0378-7753

Document Version

Postprint

Comments

The document available for download is the authors' accepted manuscript, provided in compliance with publisher policies on self-archiving. Permission documentation is on file. Some differences may exist between this version and the published version; as such, those wishing to quote directly from this source are advised to consult the version of record.

Publisher

Elsevier

Volume

301

Peer Reviewed

yes

Keywords

Ceramic/polymer/ceramic hybrid separator, Charge-transfer resistance, Lithium plating/stripping, Voltage polarization, Dendrite proof separator, Lithium batteries