Semisolid electrolyte solution, semisolid electrolyte, semisolid electrolyte layer, electrode, and secondary battery

Patent metadata

Field	Value
Publication number	US-11063298-B2
Application number	US-201816605527-A
Country	US
Kind code	B2
Filing date	Mar 16, 2018
Priority date	Jun 8, 2017
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

Provided is a semisolid electrolyte solution to improve a battery capacity of a secondary battery. The semisolid electrolyte solution includes: a solvated electrolyte salt; and an ether-based solvent that constitutes the solvated electrolyte salt and a solvated ion liquid, in which a mixing ratio of the ether-based solvent to the solvated electrolyte salt is larger than 0 and equal to or less than 0.5 in terms of a molar ratio. Desirably, the mixing ratio of the ether-based solvent to the solvated electrolyte salt is 0.2 to 0.5 in terms of the molar ratio. When a low viscosity solvent is provided, a mixing ratio of the low viscosity solvent to the solvated electrolyte salt is 2 to 6 in terms of the molar ratio.

First claim

The invention claimed is:

1. A semisolid electrolyte solution comprising:
a solvated electrolyte salt;
an ether-based solvent that constitutes the solvated electrolyte salt and a solvated ion liquid, and
a low viscosity solvent having a lower viscosity than a mixed solution of the ether-based solvent and the solvated electrolyte salt, wherein
a mixing ratio of the low viscosity solvent to the solvated electrolyte salt is 2 to 6 in terms of the molar ratio, and
a mixing ratio of the ether-based solvent to the solvated electrolyte salt is larger than 0 and less than 0.5 in terms of a molar ratio,
wherein the ether-based solvent is a glyme represented by R—O(CH 2 CH 2 O) n —R′, in which R and R′ are saturated hydrocarbons and n is an integer.

2. The semisolid electrolyte solution according to claim 1 , wherein
the mixing ratio of the ether-based solvent to the solvated electrolyte salt is 0.2 to less than 0.5 in terms of the molar ratio.

3. The semisolid electrolyte solution according to claim 1 , further comprising:
an additive.

4. The semisolid electrolyte solution according to claim 1 , wherein
the solvated electrolyte salt is a lithium imide salt.

5. The semisolid electrolyte solution according to claim 1 , wherein
the low viscosity solvent is propylene carbonate or ethylene carbonate.

6. A semisolid electrolyte comprising:
the semisolid electrolyte solution according to claim 1 ; and
carrier particles, wherein
the semisolid electrolyte solution is carried on the carrier particles.

7. A semisolid electrolyte layer comprising:
the semisolid electrolyte according to claim 6 and a semisolid electrolyte binder.

8. An electrode comprising:
the semisolid electrolyte solution according to claim 1 .

9. A secondary battery comprising: a positive electrode, a negative electrode, and the semisolid electrolyte layer according to claim 7 .

Assignees

• Hitachi Ltd

Inventors

• Ueda Suguru
• UNEMOTO Atsushi
• Tanaka Akihide
• Iijima Atsushi
• Kawaji Jun

Classifications

• H01M10/0567

  characterised by the additives · CPC title

• H01M10/0569 Primary

  characterised by the solvents · CPC title

• H01M10/0525 Primary

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

• H01M10/0568

  characterised by the solutes · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title