# US 2017/0288270 A1 · Liquid electrolyte formulations with high salt content

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- Number: US 2017/0288270 A1
- Document ID: US20170288270A1
- Status: Published application
- Kind: A1
- Application number: 15/472,938
- Filed: 2017-03-29
- Published: 2017-10-05
- Earliest claimed: 2016-03-30
- Assignees: Wildcat Discovery Technologies, Inc.; Medtronic, Inc.
- Applicants: Wildcat Discovery Technologies, Inc.
- Inventors: Bin Li; Marissa Caldwell; Prabhakar Tamirisa
- Web page: https://patentgrep.com/patent/US20170288270A1

## CPC

- H01M 10/0568: characterised by the solutes
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0569: characterised by the solvents
- H01M 2300/0028: characterised by the solvent
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Electrolyte formulations including a high salt concentration. The electrolyte formulation includes an organic solvent and a lithium salt, wherein the lithium salt is mixed with the organic solvent at a concentration of at least 20 Mole %, or at least 40 Mole %, or at least 50 Mole %. The organic solvent includes N-methyl-2-pyrrolidone, butylene carbonate, butyl propionate, pentyl acetate, γ-caprolactone, propylene glycol sulfite, ethyl methyl sulfone, butyl sulfoxide or combinations thereof. The lithium salt includes lithium bis(trifluoromethane sulfonyl) imide, lithium tetrafluoroborate, or lithium hexafluorophosphate.

## Claims

### Claim 1

An electrolyte for a battery, comprising:
an organic solvent and a lithium salt, wherein the lithium salt is mixed with the organic solvent at a concentration of at least 20 Mole %.

### Claim 2 (depends on 1)

The electrolyte of claim 1, wherein the lithium salt is mixed with the organic solvent at a concentration of at least 40 Mole %.

### Claim 3 (depends on 1)

The electrolyte of claim 1, wherein the lithium salt is mixed with the organic solvent at a concentration of at least 50 Mole %.

### Claim 4 (depends on 1)

The electrolyte of claim 1 wherein the organic solvent comprises N-methyl-2-pyrrolidone.

### Claim 5 (depends on 1)

The electrolyte of claim 1 wherein the organic solvent comprises butylene carbonate.

### Claim 6 (depends on 1)

The electrolyte of claim 1 wherein the organic solvent comprises butyl propionate.

### Claim 7 (depends on 1)

The electrolyte of claim 1 wherein the organic solvent comprises pentyl acetate.

### Claim 8 (depends on 1)

The electrolyte of claim 1 wherein the organic solvent comprises y-caprolactone.

### Claim 9 (depends on 1)

The electrolyte of claim 1 wherein the organic solvent comprises propylene glycol sulfite.

### Claim 10 (depends on 1)

The electrolyte of claim 1 wherein the organic solvent comprises ethyl methyl sulfone.

### Claim 11 (depends on 1)

The electrolyte of claim 1 wherein the organic solvent comprises butyl sulfoxide.

### Claim 12 (depends on 1)

The electrolyte of claim 1 wherein the lithium salt comprises lithium bis(trifluoromethane sulfonyl) imide.

### Claim 13 (depends on 1)

The electrolyte of claim 1 wherein the lithium salt comprises lithium tetrafluoroborate.

### Claim 14 (depends on 1)

The electrolyte of claim 1 wherein the lithium salt comprises lithium hexafluorophosphate.