Electrode material, method for producing the same, electrode and battery

Patent metadata

Field	Value
Publication number	US-9391330-B2
Application number	US-201314134713-A
Country	US
Kind code	B2
Filing date	Dec 19, 2013
Priority date	Dec 10, 2007
Publication date	Jul 12, 2016
Grant date	Jul 12, 2016

Abstract

An electrode material containing an electrode active material, and a carbonaceous coating film which covers the electrode active material and contains sulfur; and an electrode material including a secondary particle including a plurality of primary particles as the electrode active material, wherein the primary particles are covered with a carbonaceous coating film so that the carbonaceous coating film is interposed between the primary particles and the carbonaceous coating film contains sulfur.

First claim

We claim:

1. An electrode material comprising:
a secondary particle that includes a plurality of primary particles which are an electrode active material, wherein
the primary particles are covered with a single layer carbonaceous coating film so that the carbonaceous coating film is interposed between the primary particles, wherein the thickness of the carbonaceous coating film is 0.1 to 20 nm, and wherein a plurality of the primary particles are bonded to each other by the carbonaceous coating film,
the carbonaceous coating film contains sulfur, and
the electrode active material includes at least one selected from the group consisting of lithium cobaltate, lithium nickelate, lithium manganate, lithium titanate and a compound represented by Li x A y B z PO 4 , wherein A is one kind or two or more kinds selected from the group consisting of Co, Mn, Ni, Fe, Cu, and Cr; B is one kind or two or more kinds selected from the group consisting of Mg, Ca, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, Sc, Y, and rare-earth elements; 0≦x<2; 0<y<1.5; and 0≦z<1.5.

2. The electrode material according to claim 1 , wherein the carbonaceous coating film further contains lithium.

3. A method for producing the electrode material of claim 1 , comprising:
spraying and drying slurry including an electrode active material or a precursor of the electrode active material, an organic compound, and sulfur or a sulfur compound to generate a granular material; and
performing a heat treatment on the granular material under a non-oxidizing atmosphere of 500° C. or higher and 1000° C. or lower to generate the electrode material.

4. The method for producing the electrode material according to claim 3 , wherein the slurry further includes at least one of lithium and a lithium compound.

5. An electrode which is formed using an electrode material according to claim 1 .

6. A battery having a positive electrode which is the electrode according to claim 5 .

7. An electrode which is formed using an electrode material according to claim 2 .

8. The electrode material according to claim 1 , wherein the electrode active material is the compound represented by Li x A y B z PO 4 .

9. The electrode material according to claim 1 , wherein the carbonaceous coating film that contains sulfur includes carbon that forms C—S bonding.

10. The electrode material according to claim 1 , wherein the content of sulfur in the carbonaceous coating film is 0.1 to 50 mass %.

Assignees

• Sumitomo Osaka Cement Co Ltd

Inventors

• Kitagawa Takao
• Saito Mitsumasa

Classifications

• C01B25/37 Primary

  Phosphates of heavy metals · CPC title

• H01M4/5825

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

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M4/583 Primary

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/505

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