Non-aqueous electrolyte secondary battery and production method thereof

Patent metadata

Field	Value
Publication number	US-10490808-B2
Application number	US-201815886144-A
Country	US
Kind code	B2
Filing date	Feb 1, 2018
Priority date	Feb 18, 2011
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

According to one embodiment, there is provided a non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode including a negative electrode active material layer, and a non-aqueous electrolyte. The negative electrode active material layer contains carbon dioxide and releases the carbon dioxide in the range of 0.1 ml to 5 ml per 1 g when heated at 200° C. for 1 minute.

First claim

What is claimed is:

1. A method for producing a non-aqueous electrolyte secondary battery, comprising:
drying a powder of a negative electrode active material by heating;
preparing a slurry containing the powder of the negative electrode active material after the heating, under an atmosphere of a dew point of −10° C. or less; and
producing a negative electrode by using the slurry, under an atmosphere of a dew point of −10° C. or less.

2. The method according to claim 1 ,
wherein the temperature for heating the powder of the negative electrode active material is in the range of 250° C. to 650° C.

3. The method according to claim 1 , wherein the temperature for heating the powder of the negative electrode active material is in the range of 150° C. to 600° C.

4. The method according to claim 1 , wherein a time for heating the powder of the negative electrode active material is in the range of 3 to 24 hours.

5. The method according to claim 1 , wherein production of the negative electrode comprises:
applying the slurry to a negative electrode current collector;
drying the slurry to form a negative electrode active material layer; and
pressing the negative electrode active material layer together with the negative electrode current collector.

6. The method according to claim 1 , wherein preparation of the slurry comprises suspending the negative electrode active material, a conductive agent, and a binder in a solvent.

7. The method according to claim 1 , wherein the negative electrode active material comprises at least one oxide selected from the group consisting of a lithium titanium composite oxide and a titanium oxide.

8. The method according to claim 7 , wherein the oxide has a lithium ion absorption potential of 0.4 V or more (versus Li/Li + ).

9. A method for producing a non-aqueous electrolyte secondary battery, comprising:
drying a powder of a negative electrode active material by heating;
preparing a slurry containing the powder of the negative electrode active material after the heating, under an atmosphere of a dew point of −10° C. or less; and
producing a negative electrode by using the slurry, under an atmosphere of a dew point of −10° C. or less,
wherein the non-aqueous electrolyte battery comprises:
a positive electrode;
a negative electrode comprising a negative electrode active material layer; and
a non-aqueous electrolyte;
wherein the negative electrode active material layer contains carbon dioxide and releases the carbon dioxide in the range of 0.1 ml to 5 ml per 1 g when heated at 200° C. for 1 minute.

10. The method according to claim 6 , wherein production of the negative electrode comprises:
applying the slurry to a negative electrode current collector;
drying the slurry to form a negative electrode active material layer; and
pressing the negative electrode active material layer together with the negative electrode current collector.

11. The method according to claim 7 , wherein production of the negative electrode comprises:
applying the slurry to a negative electrode current collector;
drying the slurry to form a negative electrode active material layer; and
pressing the negative electrode active material layer together with the negative electrode current collector.

12. The method according to claim 8 , wherein production of the negative electrode comprises:
applying the slurry to a negative electrode current collector;
drying the slurry to form a negative electrode active material layer; and
pressing the negative electrode active material layer together with the negative electrode current collector.

13. The method according to claim 9 , wherein production of the negative electrode comprises:
applying the slurry to a negative electrode current collector;
drying the slurry to form a negative electrode active material layer; and
pressing the negative electrode active material layer together with the negative electrode current collector.

Assignees

• Toshiba Kk

Inventors

• Matsuno Shinsuke
• Saruwatari Hidesato
• Yamamoto Dai
• Kondo Asato
• Kuriyama Hiromichi
• Satake Hideki
• Kuboki Takashi

Classifications

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/133 Primary

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title