Method for producing a non-aqueous secondary battery

Patent metadata

Field	Value
Publication number	US-9698450-B2
Application number	US-201314401641-A
Country	US
Kind code	B2
Filing date	Apr 30, 2013
Priority date	May 18, 2012
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

A non-aqueous secondary battery production method is provided. The method comprises constructing a preconditioning cell that comprises a positive electrode comprising a positive electrode active material, a preconditioning electrolyte solution comprising a supporting salt and a fluorine-containing non-ionic compound, and a preconditioning negative electrode (step S 110 ); of carrying out a preconditioning process by charging the preconditioning cell and allowing the fluorine-containing non-ionic compound to be decomposed at the positive electrode to form coatings on surfaces of the positive electrode active material (step S 120 ); and of constructing a non-aqueous secondary battery, using the coated positive electrode active material, a non-aqueous electrolyte solution different from the preconditioning electrolyte solution, and a negative electrode comprising a negative electrode active material (step S 130 ).

First claim

The invention claimed is:

1. A method for producing a non-aqueous secondary battery comprising:
constructing a preconditioning cell that comprises a positive electrode comprising a positive electrode active material, a preconditioning electrolyte solution comprising a supporting salt and a fluorine containing non-ionic compound, and a preconditioning negative electrode;
carrying out a preconditioning process by charging the preconditioning cell and allowing the fluorine-containing non-ionic compound to be decomposed at the positive electrode to form coatings on surfaces of the positive electrode active material; and
constructing a non-aqueous secondary battery, using the positive electrode active material having the coatings formed, a non-aqueous electrolyte solution different from the preconditioning electrolyte solution, and a negative electrode comprising a negative electrode active material.

2. The method according to claim 1 wherein the preconditioning electrolyte solution comprises a fluorine-containing carbonate as the fluorine-containing non-ionic compound.

3. The method according to claim 1 wherein the preconditioning electrolyte solution comprises a fluorine-containing cyclic carbonate as the fluorine-containing non-ionic compound.

4. The method according to claim 1 wherein the preconditioning electrolyte solution comprises at least one of transdifluoroethylene carbonate and mono-fluoroethylene carbonate as the fluorine-containing non-ionic compound.

5. The method according to claim 1 wherein the nonaqueous electrolyte solution used for constructing the non-aqueous secondary battery comprises a supporting salt and a non-aqueous solvent, with the non-aqueous solvent consisting essentially of a fluorine-free non-ionic compound.

6. The method according to claim 1 wherein, in the preconditioning process, the fluorine-containing non-ionic compound is allowed to be decomposed with the positive electrode being at a potential above 4.3 V versus lithium metal.

7. The method according to claim 1 wherein the battery is the non-aqueous secondary battery in which the positive electrode operates at a potential above 4.3 V versus lithium metal.

8. The method according to claim 1 wherein the positive electrode active material comprises a spinel lithium nickel manganese oxide.

9. A non-aqueous secondary battery produced by the method according to claim 1 .

10. A power-supply unit comprising
a non-aqueous secondary battery according to claim 9 , and
a control circuit that is electrically connected to the battery and controls at least the upper voltage limit of the battery, wherein
the upper voltage limit is set at a level that allows the positive electrode of the battery to reach a potential above 4.3 V versus lithium metal.

Assignees

• Toyota Motor Co Ltd

Inventors

• Abe Takeshi
• Kawai Toshiyuki
• Kinoshita Shinichi
• Mitsui Takamichi

Classifications

• H01M10/4242 Primary

  Regeneration of electrolyte or reactants · CPC title

• H01M10/4257

  Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries · CPC title

• H01M10/0567

  characterised by the additives · CPC title

• Y10T29/49108

  Electric battery cell making · CPC title

• H01M4/0445 Primary

  Forming after manufacture of the electrode, e.g. first charge, cycling · CPC title