ELECTROLYTE SOLUTION FOR ELECTROCHEMICAL DEVICE, AND ELECTROCHEMICAL DEVICE

• US 20150364792A1
• Filed: 01/22/2014
• Published: 12/17/2015
• Est. Priority Date: 01/25/2013
• Status: Active Grant

• Current Assignee: FUJIFILM Wako Pure Chemical Corporation (Fujifilm Holdings Corporation)
• Original Assignee: WAKO Pure Chemical Industries Limited (Fujifilm Holdings Corporation)
• Inventors: Watahiki, Tsutomu, Kiyosu, Takahiro, Okamoto, Kuniaki, Sato, Kazuhiko, Mori, Goro
• Granted Patent: US 10,439,252 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01M 10/054 Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
• CPC Class Codes: H01M 10/0566 Liquid materials
• CPC Class Codes: H01M 10/0568 characterised by the solutes
• CPC Class Codes: H01M 10/0569 characterised by the solvents
• CPC Class Codes: H01M 2300/0028 characterised by the solvent
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

It is an object of the present invention to provide an electrochemical device having an electrolytic solution having high current density, as well as high safety, where dissolution and deposition of magnesium progress repeatedly and stably. Furthermore, the present invention relates to an electrolytic solution for an electrochemical device, comprising (1) a supporting electrolyte comprising a magnesium salt, and (2) at least one or more kinds of the compound represented by following general formula (I)

(wherein n represents an integer of 0 to 6, and n pieces of R₁ and n pieces of R₂ each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a halogenoalkyl group having 1 to 6 carbon atoms. A₁ and A₂ each independently represent —C(═O)—R₃, —O—R₅, —N(R₄)—R₃, —S—R₃, —C(═O)—OR₃, —O—C(═O)—R₃, —C(═O)—N(R₄)—R₃, —N(R₄)—C(═O)—R₃, —SO₂—R₃, —N(R₄)—SO₂—R₃, —O—B(OR₅)₂, —O—P(═O)(OR₅)₂, —CN, a monocyclic heterocyclic group, a group derived from cyclic acetal, a group derived from a cyclic carbonate ester, a group derived from a cyclic carboxylate ester).

Claims

1. An electrolytic solution for an electrochemical device, comprising

(1) a supporting electrolyte comprising a magnesium salt, and

(2) at least one or more kinds of the compound represented by following general formula (I)

2. The electrolytic solution according to claim 1, wherein the supporting electrolyte comprises at least one kind of the magnesium salt represented by following general formula (II);

MgX_q 

 

(II)

wherein Mg represents magnesium ion, q represents 1 or 2,

when q is 1, X represents oxide ion (O²⁻

), sulfide ion (S²⁻

), sulfate ion (SO₄²⁻

), hydrogen phosphate ion (HPO₄²⁻

), or carbonate ion (CO₃²⁻

), which is a divalent anion, when q is 2, X represents a perfluoroalkanesulfonate ion having 1 to 4 carbon atoms, a bis(perfluoroalkanesulfonyl)imide ion represented by following general formula (III)

3. The electrolytic solution according to claim 1, wherein the concentration of the supporting electrolyte is 0.1 to 5.0 mol/L.

4. The electrolytic solution according to claim 1, further comprising (3) an organic solvent.

5. The electrolytic solution according to claim 4, wherein the organic solvent comprises at least one kind selected from an ether type solvent, an alcohol type solvent, a carbonate type solvent, an ester type solvent, a nitrile type solvent, a sulfone type solvent, a halogen type solvent, a hydrocarbon type solvent, and ionic liquid.

6. The electrolytic solution according to claim 4, wherein the organic solvent is dimethoxyethane, 2-methyltetrahydrofuran, diethylene glycol dimethyl ether, propylene carbonate, acetonitrile, butyrolactone, ethanol or ethyl acetate, propionitrile, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate or tetraethylammonium trifluoromethanesulfonate.

7. An electrochemical device comprising the electrolytic solution according to any one of claims 1 to 6, a positive electrode, a negative electrode and a separator.