Lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-2016351900-A1
Application number	US-201615168804-A
Country	US
Kind code	A1
Filing date	May 31, 2016
Priority date	Jun 1, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

There is provided a lithium ion secondary battery with a high capacity and having excellent cycle characteristics. The lithium ion secondary battery, including a positive electrode, a negative electrode, a separator and a nonaqueous electrolyte liquid. Here, the positive electrode comprises a positive electrode material in which a surface of particles of a positive electrode active material is coated with an Al-containing oxide. The Al-containing oxide has an average coating thickness of 5 to 50 nm. The positive electrode active material contained in the positive electrode material comprises a lithium cobalt oxide comprising Co and at least one kind of an element M 1 selected from the group consisting of Mg, Zr, Ni, Mn, Ti and Al. The negative electrode comprises a material S including SiO x (0.5≦x≦1.5) as a negative electrode active material, wherein in 100 mass % of a total of the negative electrode active material included in the negative electrode, the materials S is included in the negative electrode active material at a content of 10 mass % or more.

First claim

What is claimed is:

1 . A lithium ion secondary battery, comprising a positive electrode, a negative electrode, a separator and a nonaqueous electrolyte liquid,
wherein the positive electrode comprises a positive electrode material in which a surface of particles of a positive electrode active material is coated with an Al-containing oxide, wherein the Al-containing oxide has an average coating thickness of 5 to 50 nm, wherein the positive electrode active material contained in the positive electrode material comprises a lithium cobalt oxide comprising Co and at least one kind of an element M 1 selected from the group consisting of Mg, Zr, Ni, Mn, Ti and Al, wherein the negative electrode comprises a material S including SiO x (0.5≦x≦1.5) as a negative electrode active material, wherein in 100 mass % of a total of the negative electrode active material included in the negative electrode,
the materials S is included in the negative electrode active material at a content of 10 mass % or more.

2 . The lithium ion secondary battery according to claim 1 , wherein at the time when the lithium ion secondary battery is discharged at an discharge current rate of 0.1 C to reach a voltage of 2.0V, a molar ratio (Li/M) of Li and a metal M except for Li is 0.9 to 1.05, wherein said Li and said metal M are contained in the positive electrode material and the positive electrode active material in the positive electrode.

3 . The lithium ion secondary battery according to claim 1 , wherein the positive electrode material has a specific surface area of 0.1 to 0.4 m 2 /g.

4 . The lithium ion secondary battery according to claim 1 , wherein the negative electrode comprises a negative electrode composition layer including a negative electrode active material, the negative electrode composition layer being formed on one surface or both surfaces of a current collector, wherein the current collector is made of a current collection foil having a through hole penetrating from one surface thereof to the other surface thereof.

5 . The lithium ion secondary battery according to claim 1 , wherein the nonaqueous electrolyte liquid includes a nitrile additive.

6 . The lithium ion secondary battery according to claim 1 , wherein the nonaqueous electrolyte liquid includes 1,3-dioxane.

7 . The lithium ion secondary battery according to claim 1 , wherein in addition to the positive electrode material, the positive electrode further comprises a lithium nickel oxide comprising Ni, Co and an element M 2 selected from the group consisting of Mg, Mn, Ba, W, Ti, Zr, Mo and Al.

Assignees

• Hitachi Maxell

Inventors

• Sekiya Tomohito
• Abe Hirosi
• Inaba Akira
• Yoshikawa Susumu
• Hashimoto Yuji
• Ishizawa Seiji
• Abe Toshihiro

Classifications

• H01M4/366

  as layered products · CPC title

• H01M4/48

  of inorganic oxides or hydroxides · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/0567

  characterised by the additives · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title