# US 7,744,659 B2 · Method of making non-aqueous electrochemical cell

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- Number: US 7,744,659 B2
- Document ID: US7744659B2
- Status: Granted
- Kind: B2
- Application number: 12/486,111
- Filed: 2009-06-17
- Published: 2009-10-29
- Granted: 2010-06-29
- Earliest claimed: 2002-02-28
- Assignees: The Gillette Company
- Inventors: William L. Bowden; Nikolai N. Issaev; Michael Pozin
- Web page: https://patentgrep.com/patent/US7744659B2

## CPC

- H01M 10/052: Li-accumulators
- H01M 6/164: {by the solvent}
- H01M 6/166: {by the solute}
- H01M 10/0568: characterised by the solutes
- H01M 10/0569: characterised by the solvents
- H01M 2300/0037: Mixture of solvents
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- Y10T 29/49108: Electric battery cell making
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method of making a lithium electrochemical cell includes treating the cathode active material with an agent that includes lithium but not sodium. A cathode including the cathode active material, an anode, a separator, and an electrolyte are assembled in a housing to provide a cell containing less than 1500 ppm by weight of sodium.

## Claims

### Claim 1

A method of manufacturing a lithium electrochemical cell containing less than 1500 ppm by weight of sodium, the method comprising
(a) cleaning a case with a solution that does not contain sodium,
(b) providing a cathode, an anode, a separator, and an electrolyte comprising a first ether and lithium iodide, wherein the first ether is dimethyoxyethane, and wherein the electrolyte in addition to the first ether also includes dioxolane, these components having sufficiently low quantities of sodium that, when combined with the case, can provide a lithium electrochemical cell containing less than 1500 ppm by weight of sodium, and
(c) assembling the cathode, the anode, the separator, and the electrolyte from step (b) into the case from step (a) to provide a lithium electrochemical cell containing less than 1500 ppm by weight of sodium.

### Claim 2 (depends on 1)

The method of claim 1, wherein the cell contains less than 1200 ppm by weight of sodium.

### Claim 3 (depends on 1)

The method of claim 1, wherein the cell contains less than 1000 ppm by weight of sodium.

### Claim 4 (depends on 1)

The method of claim 1, wherein the cell contains less than 800 ppm by weight of sodium.

### Claim 5 (depends on 1)

The method of claim 1, wherein the cell contains less than 600 ppm by weight of sodium.

### Claim 6 (depends on 1)

The method of claim 1, wherein the first ether is dimethoxyethane and the electrolyte comprises 40-80% by weight of the dimethoxyethane.

### Claim 7 (depends on 1)

The method of claim 1, wherein the cathode comprises manganese dioxide.

### Claim 8 (depends on 1)

The method of claim 1, wherein the cathode comprises iron disulfide.

### Claim 9 (depends on 1)

The method of claim 1, wherein the solution includes a neutralizing agent.

### Claim 10 (depends on 1)

The method of claim 1, wherein the neutralizing agent is lithium hydroxide.