# US 9,437,900 B2 · Electrolyte, method for fabricating electrolyte solution, and lithium ion battery

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- Number: US 9,437,900 B2
- Document ID: US9437900B2
- Status: Granted
- Kind: B2
- Application number: 13/596,760
- Filed: 2012-08-28
- Published: 2013-06-20
- Granted: 2016-09-06
- Earliest claimed: 2011-12-20
- Assignees: Industrial Technology Research Institute
- Applicants: Ting-Ju Yeh; Shih-Chieh Liao; Jin-Ming Chen
- Inventors: Ting-Ju Yeh; Shih-Chieh Liao; Jin-Ming Chen
- Web page: https://patentgrep.com/patent/US9437900B2

## CPC

- H01M 10/0567: characterised by the additives
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2300/0025: Organic electrolyte
- 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

An electrolyte for a lithium ion battery is provided, including a carrier, a lithium salt dissolved in the carrier, and an additive uniformly dispersed in the carrier, wherein the additive is an inorganic clay modified by an organic quaternary phosphonium salt. Also provided is a method for fabricating an electrolyte solution and a lithium ion battery.

## Claims

### Claim 1

An electrolyte for a lithium ion battery, comprising:
a carrier;
a lithium salt dissolved in the carrier; and
an additive uniformly dispersed in the carrier, wherein the additive is an inorganic clay modified by an organic quaternary phosphonium salt, and the organic quaternary phosphonium salt is intercalated into the inorganic clay, wherein the organic quaternary phosphonium salt is tetrabutylphosphonium hexafluorophosphate and is 0.05-5 wt % in the electrolyte.

### Claim 2 (depends on 1)

The electrolyte as claimed in claim 1, wherein the additive comprises a nano layer structure.

### Claim 3 (depends on 2)

The electrolyte as claimed in claim 2, wherein the nano layer structure comprises two layers of tetrahedral silicon dioxide and one layer of octahedral aluminum hydroxide.

### Claim 4 (depends on 1)

The electrolyte as claimed in claim 1, wherein the additive is about 0.1-5 wt % of the electrolyte.

### Claim 5 (depends on 1)

The electrolyte as claimed in claim 1, wherein the carrier comprises cyclic carbonates, chain-shaped carbonates, cyclic ether, or chain-shaped ether.

### Claim 6 (depends on 1)

The electrolyte as claimed in claim 1, wherein the lithium salt comprises LiPF6, LiBOB, LiBF4, LiClO4, or a lithium salt having a central atom of C, N, B, or Al.

### Claim 7 (depends on 1)

A lithium ion battery, comprising:
an anode;
a cathode; and
an ion-conducting layer sandwiched between the cathode and the anode, wherein the ion-conducting layer comprises the electrolyte as claimed in claim 1.

### Claim 8 (depends on 7)

The lithium ion battery as claimed in claim 7, wherein the cathode comprises LiFePO4, LiMn2O4, LiCoO2, LiNixCoyO2, LiNixMnyO4 or (LiNixCoyMnzO2).

### Claim 9 (depends on 7)

The lithium ion battery as claimed in claim 7, wherein the anode comprises carbon, graphite, mesocarbon microbeads (MCMB), Li4Ti5O12, or Li.

### Claim 10

A method for fabricating an electrolyte solution, comprising:
providing an organic solution;
providing a modifier to the organic solution, forming a first mixture solution, wherein the modifier comprises an organic quaternary phosphonium salt and the organic quaternary phosphonium salt is tetrabutylphosphonium hexafluorophosphate;
providing a clay-containing organic solution and mixing the solution with the first mixture solution, forming a second mixture solution, wherein the clay-containing organic solution comprises inorganic clay and the organic quaternary phosphonium salt is intercalated into the inorganic clay; and
dissolving a lithium salt in the second mixture solution, thereby obtaining the electrolyte solution, wherein the modifier is about 0.05-5 wt % of the electrolyte solution.

### Claim 11 (depends on 10)

The method as claimed in claim 10, wherein the inorganic clay is about 0.1-5 wt % of the electrolyte solution.

### Claim 12 (depends on 10)

The method as claimed in claim 10, wherein the inorganic clay in the electrolyte solution is modified into hydrophobic clay by the modifier, and the inorganic clay is formed with a nano layer structure.

### Claim 13 (depends on 12)

The method as claimed in claim 12, wherein the nano layer structure comprises montmorillonite, beidellite, canbyite, semctite, kaolium, or mica.

### Claim 14 (depends on 10)

The method as claimed in claim 10, wherein the organic solution comprises cyclic carbonates, chain-shaped carbonates, cyclic ester, chain-shaped ester or polymer.

### Claim 15 (depends on 10)

The method as claimed in claim 10, wherein the lithium salt comprises LiPF6, LiBOB, LiBF4, LiClO4, or a lithium salt having a central atom of C, N, B, or Al.