Fluorine-free electrolytes for all-solid sodium-ion batteries based on percyano-substituted organic salts.

ABSTRACT: A new family of fluorine-free solid-polymer electrolytes, for use in sodium-ion battery applications, is presented. Three novel sodium salts withdiffuse negative charges: sodium pentacyanopropenide (NaPCPI), sodium 2,3,4,5-tetracyanopirolate (NaTCP) and sodium 2,4,5-tricyanoimidazolate (NaTIM) were designed andtested in a poly(ethylene oxide) (PEO) matrix as polymer electrolytes for anall-solid sodium-ion battery. Due to unique, non-covalent structural configurations of anions, improved ionic conductivities were observed. As an example, "liquid-like" high conductivities (>1?mS cm-1) were obtained above 70?°C for solid-polymer electrolyte with a PEO to NaTCP molar ratio of 16:1. All presented salts showed high thermal stability and suitable windows of electrochemical stability between 3 and 5?V. These new anions open a new class of compounds with non-covalent structure for electrolytes system applications.

SUBMITTER: Bitner-Michalska A 

PROVIDER: S-EPMC5220368 | biostudies-other | 2017 Jan

REPOSITORIES: biostudies-other