Electrolyte material, and battery material and secondary battery using said electrolyte material

摘要

The present invention provides a stable electrolyte material that provides high safety, exhibits favorable ionic conductivity not only at room temperature but also in the low temperature range at or below room temperature, has excellent reduction resistance, and can be suitably used as a material of a lithium ion cell. The electrolyte material includes, as essential components, a specific polymer having an ether bond in a side chain thereof, and a specific electrolyte salt.

主权项

1. An electrolyte material comprising, as essential components thereof,
a polymer having an ether bond in a side chain thereof, and an electrolyte salt, the polymer including a copolymer comprising a linear polymer chain which contains repeating units of the polymerized form of a monomer represented by the following formula (1) and —CH2—CH— structure formed by a polymerization reaction of a vinyl group in another polymerizable monomer having a vinyl group or a homopolymer whose polymer chain consists of repeating units of the polymerized form a of a monomer represented by the following formula (1): wherein R1 represents a hydrogen atom or a methyl group; X represents a methylene group or a direct bond; each Ra is the same as or different from each other, each representing a C1 to C4 linear or branched hydrocarbon group; R2 represents a C1 to C18 aliphatic or alicyclic alkyl group, C6 to C18 aryl group, alkyl-substituted aryl group, (alkyl)phenyl-substituted aryl group or aryl-substituted alkyl group; and n represents an average number of added moles of a group represented by RaO and wherein n is in the range of 1 to 50, the electrolyte salt including an ionic compound that includes an alkali metal cation and at least one anion selected from the group consisting of PF6−, BF4−, CF3SO3−, tetracyanoborate, and R3SO2N−SO2R4 wherein R3 and R4 are the same as or different from each other, each representing either F, CF3, or C2F5.