Lithium secondary battery and method for manufacturing battery-incorporating device

Patent metadata

Field	Value
Publication number	US-11757134-B2
Application number	US-202016808550-A
Country	US
Kind code	B2
Filing date	Mar 4, 2020
Priority date	Oct 17, 2017
Publication date	Sep 12, 2023
Grant date	Sep 12, 2023

Abstract

Provided is a secondary lithium battery including: a positive electrode plate that is a sintered lithium complex oxide plate; a negative electrode containing carbon and styrene butadiene rubber (SBR); and an electrolytic solution containing lithium borofluoride (LiBF4) in a non-aqueous solvent composed of γ-butyrolactone (GBL), or composed of ethylene carbonate (EC) and γ-butyrolactone (GBL).

First claim

What is claimed is:

1. A secondary lithium battery, comprising:
a positive electrode plate that is a lithium complex oxide sintered plate and contains no binder;
a negative electrode containing graphite and styrene butadiene rubber (SBR); and
an electrolytic solution containing lithium borofluoride (LiBF 4 ) in a non-aqueous solvent composed of γ-butyrolactone (GBL), or composed of γ-butyrolactone (GBL) and ethylene carbonate (EC);
wherein the non-aqueous solvent has an EC:GBL volume ratio of 0:1 to 1:3, and
wherein the electrolyic solution has a LiBF 4 concentration of 0.5 to 2 mol/L.

2. The secondary lithium battery according to claim 1 , further comprising a separator made of polyimide, polyester, or cellulose.

3. The secondary lithium battery according to claim 2 , wherein the separator is made of polyimide.

4. The secondary lithium battery according to claim 1 , wherein the electrolytic solution further comprises vinylene carbonate (VC), and/or fluoroethylene carbonate (FEC), and/or vinyl ethylene carbonate (VEC).

5. The secondary lithium battery according to claim 1 , having a thickness of 0.45 mm or less.

6. The secondary lithium battery according to claim 1 , wherein the lithium complex oxide is lithium cobaltate.

7. The secondary lithium battery according to claim 1 , wherein the lithium complex oxide sintered plate includes a plurality of primary grains composed of the lithium complex oxide, and is an oriented positive electrode plate in which the plurality of primary grains is oriented with a mean orientation angle of more than 0° to 30° to a plate face of the positive electrode plate.

8. The secondary lithium battery according to claim 1 , wherein the secondary lithium battery is intended to be mounted on a substrate by a process involving heating at 110° C. to lower than 260° C.

9. The secondary lithium battery according to claim 8 , wherein the process involving heating is hot lamination or reflow soldering.

10. A method for manufacturing a battery-incorporating device, comprising the steps of:
providing the secondary lithium battery according to claim 1 ; and
mounting the secondary lithium battery on a substrate by a process involving heating at 110° C. to lower than 260° C.

11. The method according to claim 10 , wherein the process involving heating is hot lamination or reflow soldering.

12. The method according to claim 11 , wherein the process involving heating is hot lamination, and the battery-incorporating device is a battery-incorporating smart card.

Assignees

• Ngk Insulators Ltd

Inventors

• Fujita Yuki
• Suzuki Chiori

Classifications

• H01M10/0568 Primary

  characterised by the solutes · CPC title

• H01M10/0563 Primary

  Liquid materials, e.g. for Li-SOCl2 cells · CPC title

• H01M10/0569 Primary

  characterised by the solvents · CPC title

• H01M4/131

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

• H01M10/0567

  characterised by the additives · CPC title