Solid nanocomposite electrolyte materials

Patent metadata

Field	Value
Publication number	US-11699810-B2
Application number	US-201816607126-A
Country	US
Kind code	B2
Filing date	Feb 20, 2018
Priority date	Apr 24, 2017
Publication date	Jul 11, 2023
Grant date	Jul 11, 2023

Abstract

A solid nanocomposite electrolyte material comprising a mesoporous dielectric material comprising a plurality of interconnected pores and an electrolyte layer covering inner surfaces of the mesoporous dielectric material. The electrolyte layer comprises: a first layer comprising a first dipolar compound or a first ionic compound, the first dipolar or ionic compound comprising a first pole of a first polarity and a second pole of a second polarity opposite to the first polarity, wherein the first layer is adsorbed on the inner surfaces with the first pole facing the inner surfaces; and a second layer covering the first layer, the second layer comprising a second ionic compound or a salt comprising first ions of the first polarity and second ions of the second polarity, wherein the first ions of the ionic compound or salt are bound to the first layer.

First claim

The invention claimed is:

1. A solid nanocomposite electrolyte material comprising:
a mesoporous dielectric material comprising a plurality of interconnected pores, the plurality of interconnected pores defining inner surfaces of the mesoporous dielectric material; and
an electrolyte layer covering the inner surfaces and forming an interface between the electrolyte layer and the inner surfaces,
wherein the electrolyte layer comprises:
a first layer comprising a first compound that is ionic or dipolar, the first compound comprising a first anion having a size of at least 7 nm 3 and a first cation that has a size greater than the first anion, wherein the first layer is adsorbed on the inner surfaces, thereby introducing or modifying a charge delocalization in the first compound and introducing or modifying a molecular dipole moment over the first compound; and
a second layer covering the first layer, the second layer comprising a second ionic compound comprising a second anion and a second cation, wherein the second cation comprises one or more of Li + , Na + , K + , Ca 2+ , Mg 2+ , Cu 2+ , Al 3+ , Co 2+ , or Ni 2+ , wherein the second layer is bound to the first layer, thereby weakening a bond between the second anion and the second cation and enhancing a mobility of the second cation or the second anion,
wherein a molar ratio of (a) the first compound and the second ionic compound to (b) the mesoporous dielectric material is greater than a threshold value that corresponds to an ionic conductivity of the interface being greater than a bulk ionic conductivity of the electrolyte layer.

2. The solid nanocomposite electrolyte material according to claim 1 , wherein the electrolyte layer further comprises an additional layer covering the second layer, the additional layer being a solvent and a conductor for the second layer.

3. The solid nanocomposite electrolyte material according to claim 1 , wherein the electrolyte layer further comprises an additional layer covering the second layer, the additional layer comprising the second ionic compound.

4. The solid nanocomposite electrolyte material according to claim 1 , wherein the first compound comprises an organic salt, an organic complex, a eutectic salt, or a metal salt.

5. The solid nanocomposite electrolyte material according to claim 1 , wherein the first compound comprises an ionic liquid.

6. The solid nanocomposite electrolyte material according to claim 1 , wherein the first anion comprises one or more of ClO 4 − , BF 4 − , PF 6 − , TFSI − , or BETI − .

7. The solid nanocomposite electrolyte material according to claim 1 , wherein the mesoporous dielectric material comprises silicon oxide, aluminum oxide, or a mixture thereof.

8. The solid nanocomposite electrolyte material according to claim 1 , wherein the mesoporous dielectric material has a porosity between 25% and 90%.

9. The solid nanocomposite electrolyte material according to claim 1 , wherein the plurality of interconnected pores have respective diameters between 2 nm and 50 nm.

10. The solid nanocomposite electrolyte material according to claim 9 , wherein the mesoporous dielectric material comprises a plurality of micropores having a diameter smaller than 2 nm.

11. The solid nanocomposite electrolyte material according to claim 1 , wherein the solid nanocomposite electrolyte material has an ionic conductivity higher than 1 mS/cm.

12. A solid nanocomposite electrolyte layer comprising the solid nanocomposite electrolyte material according to claim 1 .

13. The solid nanocomposite electrolyte layer according to claim 12 , wherein the plurality of interconnected pores and the electrolyte layer form a continuous path for ion conduction between a first surface of the solid nanocomposite electrolyte layer and a second opposite surface of the solid nanocomposite electrolyte layer.

14. A composite ion insertion electrode comprising a mixture of an active electrode material and the solid nanocomposite electrolyte material according to claim 1 .

15. A solid-state battery cell comprising the solid nanocomposite electrolyte layer according to claim 12 .

16. A method for forming the solid nanocomposite electrolyte material of claim 1 , wherein the method comprises:
obtaining a solution comprising:
a dielectric material precursor;
the first compound;
the second ionic compound;
deionized water; and
an alcohol; and

converting the solution into a solid material by inducing gelification of the solution, thereby forming a gel and afterward drying the gel to form the solid nanocomposite electrolyte material of claim 1 .

17. The solid nanocomposite electrolyte material according to claim 1 , wherein the electrolyte layer is substantially continuous from a first external surface of the solid nanocomposite electrolyte material to a second external surface of the solid nanocomposite electrolyte material.

18. The method of claim 16 , wherein the first compound comprises an ionic liquid.

19. The method of claim 16 , further comprising forming an additional layer covering the second layer, the additional layer comprising the second ionic compound.

20. The method of claim 16 , wherein the first compound comprises an organic salt, an organic complex, a eutectic salt, or a metal salt.

Assignees

• Imec Vzw
• Univ Leuven Kath

Inventors

• Vereecken Philippe
• Chen Xubin
• Mees Maarten

Classifications

• H01M10/0525

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

• H01M2300/0082

  Organic polymers · CPC title

• H01M2300/0071

  Oxides · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M10/056 Primary

  characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes · CPC title