Non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-2017084916-A1
Application number	US-201515126052-A
Country	US
Kind code	A1
Filing date	Mar 10, 2015
Priority date	Mar 17, 2014
Publication date	Mar 23, 2017
Grant date	—

Abstract

A nonaqueous electrolyte secondary battery has both high capacity and high regeneration. A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode contains a Ni-containing lithium transition metal oxide having a layered structure and also contains a tungsten compound and/or a molybdenum compound. The percentage of Ni is greater than 90 mole percent with respect to the molar amount of the lithium transition metal oxide. The amount of the compound is 0.1 mole percent to 1.5 mole percent with respect to the molar amount of the lithium transition metal oxide in terms of tungsten element and/or molybdenum element.

First claim

1 . A nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, and a nonaqueous electrolyte,
wherein the positive electrode contains a lithium transition metal oxide, having a layered structure, containing at least Ni and also contains a tungsten compound and/or a molybdenum compound; the percentage of Ni is greater than 90 mole percent with respect to the sum of the molar amounts of metal elements, excluding lithium, in die lithium transition metal oxide; and the amount of the tungsten compound and/or the molybdenum compound is 0.1 mole percent to 1.5 mole percent with respect to the sum of the molar amounts of the metal elements, excluding lithium, in the lithium transition metal oxide in terms of tungsten element and/or molybdenum element.

2 . The nonaqueous electrolyte secondary battery according to claim 1 , wherein the lithium transition metal oxide is composed of secondary particles formed by the aggregation of primary particles and
the tungsten compound and/or the molybdenum compound is attached to the surfaces of at least either of the primary particles and secondary particles of the lithium transition metal oxide.

3 . The nonaqueous electrolyte secondary battery according to claim 2 , wherein the tungsten compound and/or the molybdenum compound is attached to the surfaces of the primary particles and secondary particles of the lithium transition metal oxide.

4 . The nonaqueous electrolyte secondary battery according to claim 1 , wherein the tungsten compound and/or the molybdenum compound is at least one compound selected from oxides and lithium composite oxides.

5 . The nonaqueous electrolyte secondary battery according to claim 1 , wherein the phase transition of the lithium transition metal oxide occurs at a potential of 4.15 V (vs. Li/Li+) to 4.25 V (vs. Li/Li+).

6 . The nonaqueous electrolyte secondary battery according to claim 1 , wherein the lithium transition metal oxide is represented by the formula Li a Ni x M 1-x O 2 (where 0.95≦a≦1.20, 0.90<x, and M is at least one element selected from Co, Mn, and Al).

7 . The nonaqueous electrolyte secondary battery according to claim 6 , wherein the lithium transition metal oxide is represented by the formula Li a Ni x Co y Al z O 2 (where 0.95≦a≦1.20, 0.9<x, 0<y<0.10, and 0<z<0.10).

8 . The nonaqueous electrolyte secondary battery according to claim 1 , wherein the nonaqueous electrolyte contains a lithium salt containing a P—O bond in its molecule and/or a nitrile compound.

9 . The nonaqueous electrolyte secondary battery according to claim 8 , wherein the lithium salt containing the P—O bond in its molecule is lithium difluorophosphate.

10 . The nonaqueous electrolyte secondary battery according to claim 8 , wherein the nitrile compound is adiponitrile.

Assignees

• Sanyo Electric Co

Inventors

• Oka Takaaki
• Nagata Kaoru
• Takijiri Manabu
• Ogasawara Takeshi

Classifications

• H01M4/366

  as layered products · CPC title

• H01M4/505

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

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0567

  characterised by the additives · CPC title

• H01M10/0525

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