Non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-9509013-B2
Application number	US-201514753836-A
Country	US
Kind code	B2
Filing date	Jun 29, 2015
Priority date	Feb 18, 2011
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

According to one embodiment, there is provided a non-aqueous electrolyte secondary battery including a positive electrode including a positive electrode active material layer, a negative electrode including a negative electrode active material layer, and a non-aqueous electrolyte. At least one of the positive electrode active material layer and the negative electrode active material layer contains carbon dioxide and releases the carbon dioxide in the range of 0.1 ml to 10 ml per 1 g when heated at 350° C. for 1 minute.

First claim

What is claimed is:

1. A method of producing a non-aqueous electrolyte secondary battery, comprising:
preparing a slurry comprising an electrode active material under an atmosphere having a carbon dioxide concentration in the range of 0.003% to 0.03%, an amount of moisture in the atmosphere being within a range of a dew point equal to or less than −10° C., the dew point being a temperature at which a partial water vapor pressure in the atmosphere equals a saturation pressure when a temperature is lowered under a constant pressure;
forming an active material layer on a current collector from the slurry to obtain an electrode; and
assembling a non-aqueous electrolyte secondary battery comprising the electrode,
wherein the active material layer contains carbon dioxide and releases the carbon dioxide in the range of 0.1 ml to 10 ml per 1 g when heated at 350° C. for 1 minute.

2. The method according to claim 1 , wherein the active material layer shows two peaks appearing in the range of 120° C. to 350° C. in the pyrolysis-gas chromatography/mass spectrometry under a temperature rising condition of 5° C./minute, and an inequality a ≦ b is satisfied where a is a peak intensity of the low-temperature side of the two peaks and b is a peak intensity of the high-temperature side of the two peaks.

3. The method according to claim 2 , wherein
the electrode active material is a lithium titanium composite oxide,
the active material layer is a negative electrode active material layer; and
the negative electrode active material layer shows two peaks appearing in the range of 120° C. to 350° C. in the pyrolysis-gas chromatography/mass spectrometry under a temperature rising condition of 5° C./minute, and the peak of the low-temperature side of the two peaks appears in the range of 120° C. or more and less than 200° C. and the peak of the high-temperature side appears in the range of 200° C. to 350° C.

4. The method according to claim 3 , wherein the negative electrode active material layer releases carbon dioxide in the range of 0.1 ml to 5 ml per 1 g when heated at 350° C. for 1 minute.

5. The method according to claim 2 , wherein the
the electrode active material comprises at least one oxide selected from the group consisting of lithium manganese composite oxide, lithium nickel composite oxide and lithium composite phosphate compound,
the active material layer is a positive electrode active material layer; and
the positive electrode active material layer shows two peaks appearing in the range of 120° C. to 350° C. in the pyrolysis-gas chromatography/mass spectrometry under a temperature rising condition of 5° C./minute, and the peak of the low-temperature side of the two peaks appears in the range of 120° C. or more and less than 250° C. and the peak of the high-temperature side appears in the range of 200° C. to 350° C.

6. The method according to claim 5 , wherein the positive electrode active material layer releases carbon dioxide in the range of 0.5 ml to 10 ml per 1 g when heated at 350° C. for 1 minute.

7. The method according to claim 2 , comprising:
forming the negative electrode active material layer from a slurry comprising a lithium titanium composite oxide; and
forming the positive electrode active material layer from a slurry comprising at least one an oxide selected from the group consisting of lithium manganese composite oxide, lithium nickel composite oxide and lithium composite phosphate compound,

wherein
the negative electrode active material layer shows two peaks appearing in the range of 120° C. to 350° C. in the pyrolysis-gas chromatography/mass spectrometry under a temperature rising condition of 5° C./minute, and the peak of the low-temperature side of the two peaks appears in the range of 120° C. or more and less than 200° C. and the peak of the high-temperature side appears in the range of 200° C. to 350° C.;
the positive electrode active material layer shows two peaks appearing in the range of 120° C. to 350° C. in the pyrolysis-gas chromatography/mass spectrometry under a temperature rising condition of 5° C./minute, and the peak of the low-temperature side of the two peaks appears in the range of 120° C. or more and less than 250° C. and the peak of the high-temperature side appears in the range of 200° C. to 350° C.

8. The method according to claim 1 , wherein the electrode active material comprises a lithium titanium composite oxide.

9. The method according to claim 1 , wherein the current collector is aluminum foil, an aluminum alloy foil containing one or more elements selected from the group consisting of Mg, Ti, Zn, Mn, Fe, Cu and Si, or a copper foil.

10. The method according to claim 1 , wherein the electrode active material is a lithium titanium composite oxide.

11. The method according to claim 1 , wherein the electrode active material is lithium titanate (Li 4+x Ti 5 O 12 ) having a spinel structure, and lithium titanate (Li 2+x Ti 3 O 7 ) having a ramsdellite structure.

12. The method according to claim 1 , wherein the electrode active material is Li 4 Ti 5 O 12 .

Assignees

• Toshiba Kk

Inventors

• Matsuno Shinsuke
• Kuriyama Hiromichi
• Satake Hideki
• Kuboki Takashi

Classifications

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M2004/028

  Positive electrodes · CPC title