Non-aqueous electrolyte battery and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-10388960-B2
Application number	US-201715657893-A
Country	US
Kind code	B2
Filing date	Jul 24, 2017
Priority date	Mar 17, 2006
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

A non-aqueous electrolyte battery is provided that shows good cycle performance and good storage performance under high temperature conditions and exhibits high reliability even with a battery configuration featuring high capacity. A method of manufacturing the battery is also provided. A non-aqueous electrolyte battery includes: a positive electrode having a positive electrode active material layer containing a positive electrode active material; a negative electrode having a negative electrode active material layer containing a negative electrode active material; a separator interposed between the positive electrode and the negative electrode; an electrode assembly including the positive electrode, the negative electrode, and the separator; and a non-aqueous electrolyte impregnated in the electrode assembly, characterized in that: the positive electrode active material contains at least cobalt or manganese; and a coating layer is formed on a surface of the negative electrode active material layer, the coating layer including filler particles and a binder.

First claim

The invention claimed is:

1. A non-aqueous electrolyte battery comprising: a positive electrode having a positive electrode active material layer containing a positive electrode active material; a negative electrode having a negative electrode active material layer containing a negative electrode active material; a separator interposed between the positive electrode and the negative electrode; an electrode assembly comprising the positive electrode, the negative electrode, and the separator; and a non-aqueous electrolyte comprising a solvent and a lithium salt, the non-aqueous electrolyte being impregnated in the electrode assembly, wherein:
the positive electrode active material contains at least cobalt or manganese; and a coating layer consisting of filler particles and binder is provided between the negative electrode active material layer and the positive electrode active material layer, wherein the filler particles have an average particle size greater than an average pore size of the separator; and
wherein a product of x and y, where x (μm) is a thickness of the separator and y is a porosity (%) of the separator, is less than 1500 (μm·%).

2. The non-aqueous electrolyte battery according to claim 1 ,
wherein the coating layer is provided between the negative electrode active material layer and the separator.

3. The non-aqueous electrolyte battery according to claim 1 ,
wherein the coating layer is provided on the negative electrode active material layer.

4. The non-aqueous electrolyte battery according to claim 1 ,
wherein the product of x and y is less than 800 (μm·%).

5. The non-aqueous electrolyte battery according to claim 1 ,
wherein the filler particles comprise inorganic particles.

6. The non-aqueous electrolyte battery according to claim 1 ,
wherein the binder comprises a copolymer containing an acrylonitrile unit, or a polyacrylic acid derivative.

Assignees

• Sanyo Electric Co

Inventors

• Ogasawara Takeshi
• Minami Hiroshi
• Imachi Naoki
• Kaiduka Atsushi
• Baba Yasunori
• Kida Yoshinori
• Fujitani Shin

Classifications

• H01M4/621

  Binders · CPC title

• H01M4/622 Primary

  being polymers · CPC title

• H01M2010/4292

  Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode · CPC title

• H01M50/46

  Separators, membranes or diaphragms characterised by their combination with electrodes · CPC title

• H01M10/056

  characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes · CPC title