Non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-2016293936-A1
Application number	US-201415037207-A
Country	US
Kind code	A1
Filing date	Nov 18, 2014
Priority date	Nov 22, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

The present invention provides a non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode and a non-aqueous electrolyte. The working upper limit potential of the positive electrode is 4.3 V or more with metal lithium as reference. In addition, the positive electrode includes a positive electrode active material layer including a positive electrode active material, an electrically-conductive material having a DBP oil absorption of above 150 ml/100 g, and an inorganic phosphoric acid compound having an ion conductivity.

First claim

1 . A non-aqueous electrolyte secondary battery, comprising:
a positive electrode, the positive electrode comprising a positive electrode active material layer which includes a positive electrode active material, an electrically-conductive material having a DBP oil absorption of 160˜220 ml/100 g, and an inorganic phosphoric acid compound having an ion conductivity, and a working upper limit potential of the positive electrode being 4.5 V or more with metal lithium as reference; a negative electrode; and a non-aqueous electrolyte.

2 . The non-aqueous electrolyte secondary battery according to claim 1 , wherein,
a proportion of the inorganic phosphoric acid compound is 0.1 part by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the positive electrode active material.

3 . The non-aqueous electrolyte secondary battery according to claim 1 , wherein,
the inorganic phosphoric acid compound is a phosphate of at least one of an alkali metal element and an element in the group 2 of the periodic table.

4 . The non-aqueous electrolyte secondary battery according to claim 3 , wherein,
the inorganic phosphoric acid compound comprises one or more selected from the group consisting of Li 3 PO 4 , LiPON, Na 3 PO 4 and Mg 3 (PO 4 ) 2 .

5 . The non-aqueous electrolyte secondary battery according to claim 1 , wherein,
the inorganic phosphoric acid compound is a particle, and an average particle diameter of the particle is 1 μm or more and 10 μm or less.

6 . The non-aqueous electrolyte second battery according to claim 1 , wherein,
a proportion of the electrically-conductive material is 1% by mass or more and 10% by mass or less of a whole positive electrode active material layer.

7 . The non-aqueous electrolyte second battery according to claim 1 , wherein,
the positive electrode active material comprises a lithium-nickel-manganese composite oxide with a spinel structure.

8 . The non-aqueous electrolyte secondary battery according to claim 7 , wherein,
in the lithium-nickel-manganese composite oxide, one or more elements selected from the group consisting of Ti, V, Cr, Fe, Co, Cu, Zn, Al and W are doped.

Assignees

• Toyota Motor Co Ltd

Inventors

• Takebayashi Yoshitomo

Classifications

• Y02E60/10

  Energy storage using batteries · 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

• H01M4/131 Primary

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

• H01M4/5825

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