Positive electrode active material for lithium ion secondary battery, positive electrode for lithium ion secondary battery, and lithium ion secondary battery using the same

Patent metadata

Field	Value
Publication number	US-10826110-B2
Application number	US-201815922095-A
Country	US
Kind code	B2
Filing date	Mar 15, 2018
Priority date	Mar 30, 2017
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A positive electrode active material for a lithium ion secondary battery is lithium vanadium phosphate represented by a following composition expression (1) and in which a peak intensity ((002) int /(201) int ) of a (002) plane normalized with respect to a peak intensity of a (201) plane and a peak intensity ((102) int /(201) int ) of a (102) plane normalized with respect to a peak intensity of the (201) plane in an X-ray diffraction pattern satisfy 0.35≤(002) int /(201) int ≤0.53 and 0.46≤(102) int /(201) int ≤0.63, respectively, Li x VOPO 4 . . . (1).

First claim

What is claimed is:

1. A positive electrode active material for a lithium ion secondary battery comprising:
lithium vanadium phosphate represented by a following composition expression (1) and in which a peak intensity ((002) int /(201) int ) of a (002) plane normalized with respect to a peak intensity of a (201) plane and a peak intensity ((102) int /(201) int ) of a (102) plane normalized with respect to a peak intensity of the (201) plane in an X-ray diffraction pattern satisfy 0.35≤(002) int /(201) int ≤0.53 and 0.46≤(102) int /(201) int ≤0.63, respectively:
Li x VOPO 4   ( 1 )

where x satisfies 0.05≤x≤1.1.

2. The positive electrode active material for the lithium ion secondary battery according to claim 1 , wherein (002) int /(201) int and (102) int /(201) int satisfy 0.39≤(002) int /(201) int ≤0.44 and 0.50≤(102) int /(201) int ≤0.55, respectively.

3. A positive electrode for a lithium ion secondary battery using the positive electrode active material for the lithium ion secondary battery according to claim 1 .

4. A positive electrode for a lithium ion secondary battery using the positive electrode active material for the lithium ion secondary battery according to claim 2 .

5. A lithium ion secondary battery comprising:
the positive electrode for the lithium ion secondary battery according to claim 3 ;
a negative electrode containing a negative electrode active material;
a separator sandwiched between the positive electrode for the lithium ion secondary battery and the negative electrode active material; and
a non-aqueous electrolyte.

6. A lithium ion secondary battery comprising:
the positive electrode for the lithium ion secondary battery according to claim 4 ;
a negative electrode containing a negative electrode active material;
a separator sandwiched between the positive electrode for the lithium ion secondary battery and the negative electrode active material; and
a non-aqueous electrolyte.

7. The positive electrode active material for the lithium ion secondary battery according to claim 1 , wherein a primary particle diameter of the lithium vanadium phosphate satisfy 50 nm≤d≤500 nm.

Assignees

• Tdk Corp

Inventors

• SHITABA Junpei
• Seki Hideaki
• Tsuchiya Masahiro

Classifications

• H01M50/4295

  Natural cotton, cellulose or wood · CPC title

• H01M50/44

  Fibrous material · CPC title

• C01B25/45 Primary

  containing plural metal, or metal and ammonium · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/5825 Primary

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