Method of making non-aqueous electrochemical cell

• US 7,749,288 B2
• Filed: 06/18/2009
• Issued: 07/06/2010
• Est. Priority Date: 02/28/2002
• Status: Expired due to Term

• Current Assignee: Duracell U.S. Operations, Inc. (Berkshire Hathaway Incorporated)
• Original Assignee: Gillette Company (The Procter & Gamble Company)
• Inventors: Issaev, Nikolai N., Pozin, Michael, Bowden, William L.
• Primary Examiner(s): Alejandro; Raymond
• Application Number:
  US12/486,788
• Publication Number:
  US 20090265921A1
• Time in Patent Office: 383 Days
• Field of Search: 296/231, 297/30, 429/188, 429/324, 429/326, 429/333, 429/337, 429/221, 429/218.1, 204/158.2, 204/227, 204/247.2, 134/10
• US Class Current: 29/623.1
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0568 characterised by the solutes
• CPC Class Codes: H01M 10/0569 characterised by the solvents
• CPC Class Codes: H01M 2300/0037 Mixture of solvents
• CPC Class Codes: H01M 6/164 by the solvent
• CPC Class Codes: H01M 6/166 by the solute
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/49108 Electric battery cell making

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

1. A method of manufacturing a lithium electrochemical cell containing less than 1500 ppm by weight of sodium, the method comprising

(a) providing a cathode comprising a cathode active material including iron disulfide that has been treated with a neutralizing agent that includes lithium but not sodium, an anode, a separator, and an electrolyte comprising a first ether and a lithium salt, wherein the neutralizing agent includes lithium hydroxide, and wherein the first ether is dimethoxyethane, these components having sufficiently low quantities of sodium that, when combined with a case, can provide a lithium electrochemical cell containing less than 1500 ppm by weight of sodium, and

(b) assembling the cathode, the anode, the separator, and the electrolyte from step (a) into the case to provide a lithium electrochemical cell containing less than 1500 ppm by weight of sodium.

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

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

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

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

6. The method of claim 1, wherein the lithium salt includes lithium iodide.

7. The method of claim 1, wherein the electrolyte comprises 40-85% by weight of dimethoxyethane.

8. The method of claim 1, wherein the electrolyte in addition to the first ether also comprises dioxolane.