Solid electrolyte, electrode, power storage device, and method for producing solid electrolytes

Patent metadata

Field	Value
Publication number	US-2019393548-A1
Application number	US-201816481814-A
Country	US
Kind code	A1
Filing date	Oct 31, 2018
Priority date	Nov 2, 2017
Publication date	Dec 26, 2019
Grant date	—

Abstract

A solid electrolyte (10) of the present disclosure includes porous silica (11) having a plurality of pores (12) interconnected mutually and an electrolyte (13) coating inner surfaces of the plurality of pores (12). The electrolyte (13) includes 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide represented by EMI-TFSI and a lithium salt dissolved in the EMI-TFSI. A molar ratio of the EMI-TFSI to the porous silica (11) is larger than 1.5 and less than 2.0.

First claim

1 . A solid electrolyte comprising:
porous silica having a plurality of pores interconnected mutually; and an electrolyte coating inner surfaces of the plurality of pores, wherein the electrolyte comprises 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide represented by EMI-TFSI and a lithium salt dissolved in the EMI-TFSI, and a molar ratio of the EMI-TFSI to silica is larger than 1.5 and less than 2.0.

2 . The solid electrolyte according to claim 1 , wherein the lithium salt comprises lithium bis(trifluoromethanesulfonyl)imide.

3 . The solid electrolyte according to claim 2 , wherein
the electrolyte comprises a first electrolyte layer having contact with the inner surfaces of the plurality of pores, the first electrolyte layer comprises a first anion layer, a first cation layer, and a second anion layer, the first anion layer comprises a plurality of first bis(trifluoromethanesulfonyl)imide ions adsorbed to the inner surfaces of the plurality of pores of the porous silica, the first cation layer comprises a plurality of 1-ethyl-3-methylimidazolium ions ionically bonded to the plurality of first bis(trifluoromethanesulfonyl)imide ions respectively, and the second anion layer comprises a plurality of second bis(trifluoromethanesulfonyl)imide ions ionically bonded to the plurality of 1-ethyl-3-methylimidazolium ions respectively.

4 . The solid electrolyte according to claim 1 , wherein the molar ratio of the EMI-TFSI to silica is 1.7 or more and 1.8 or less.

5 . The solid electrolyte according to claim 1 , wherein
the porous silica forms a single layer, and an outer boundary of the solid electrolyte is defined by the porous silica.

6 . An electrode, comprising:
the solid electrolyte according to claim 1 ; and an electrode active material.

7 . The electrode according to claim 6 , further comprising at least one selected from a conductive agent and a binder.

8 . The electrode according to claim 6 , further comprising a conductive agent, wherein
a plurality of first particles made of the electrode active material and a plurality of second particles made of the conductive agent are fixed in a matrix of the solid electrolyte.

9 . A power storage device, comprising:
a positive electrode; a negative electrode; and the solid electrolyte according to claim 1 .

10 . A power storage device, comprising:
a positive electrode; and a negative electrode, wherein at least one selected from the positive electrode and the negative electrode is the electrode according to claim 6 .

11 . A method for producing solid electrolytes, comprising:
mixing a silicon alkoxide, 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, a lithium salt, water, and an organic solvent to prepare a liquid mixture; causing gelation of the liquid mixture to form a gel mixture; and drying the gel mixture to form a solid electrolyte.

12 . The method for producing solid electrolytes according to claim 11 , wherein the silicon alkoxide comprises at least one selected from tetraethyl orthosilicate and a substituted tetraethyl orthosilicate.

Assignees

• Imec Vzw
• Panasonic Corp

Inventors

• Vereecken Philippe
• Mees Maarten
• GANDRUD Knut Bjarne
• Sagara Akihiko
• Murata Mitsuhiro
• Kaneko Yukihiro
• Tomiyama Morio
• Shimada Mikinari

Classifications

• H01B1/127

  comprising five-membered aromatic rings in the main chain, e.g. polypyrroles, polythiophenes · CPC title

• H01M4/624

  Electric conductive fillers · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M4/621

  Binders · CPC title

• H01M10/0569

  characterised by the solvents · CPC title