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

Patent metadata

Field	Value
Publication number	US-11557789-B2
Application number	US-201816481782-A
Country	US
Kind code	B2
Filing date	Oct 31, 2018
Priority date	Nov 2, 2017
Publication date	Jan 17, 2023
Grant date	Jan 17, 2023

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(fluorosulfonyl)imide represented by EMI-FSI and a lithium salt dissolved in the EMI-FSI. A molar ratio of the EMI-FSI to the porous silica (11) is larger than 1.0 and less than 3.5.

First claim

The invention claimed is:

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(fluorosulfonyl)imide represented by EMI-FSI and a lithium salt dissolved in the EMI-FSI, and
a molar ratio of the EMI-FSI to silica is 1.1 or more and 1.5 or less.

2. The solid electrolyte according to claim 1 , wherein the lithium salt comprises lithium bis(fluorosulfonyl)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(fluorosulfonyl)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(fluorosulfonyl)imide ions respectively, and
the second anion layer comprises a plurality of second bis(fluorosulfonyl)imide ions ionically bonded to the plurality of 1-ethyl-3-methylimidazolium ions respectively.

4. 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.

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

6. The electrode according to claim 5 , further comprising at least one selected from a conductive agent and a binder.

7. The electrode according to claim 5 , further comprising the conductive agent, a plurality of first particles made of the electrode active material, and a plurality of second particles made of the conductive agent, wherein the plurality of first particles and the plurality of second particles are fixed in a matrix of the solid electrolyte.

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

9. 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 5 .

10. A method for producing solid electrolytes, comprising:
mixing a silicon alkoxide, 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMI-FSI), 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, the 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 the EMI-FSI and the lithium salt dissolved in the EMI-FSI, and having a molar ratio of the EMI-FSI to the silica of 1.1 or more and 1.5 or less.

11. The method for producing solid electrolytes according to claim 10 , wherein the silicon alkoxide comprises at least one selected from tetraethyl orthosilicate and a substituted tetraethyl orthosilicate.

Assignees

• Imec Vzw
• Univ Leuven Kath
• Panasonic Corp

Inventors

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

Classifications

• H01B13/00

  Apparatus or processes specially adapted for manufacturing conductors or cables · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2300/0071

  Oxides · CPC title

• H01M2300/0085

  Immobilising or gelification of electrolyte · CPC title