Nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-2017025715-A1
Application number	US-201515124849-A
Country	US
Kind code	A1
Filing date	Mar 5, 2015
Priority date	Mar 13, 2014
Publication date	Jan 26, 2017
Grant date	—

Abstract

A nonaqueous electrolyte secondary battery according to the present invention includes: an electrode body including a positive electrode including a positive-electrode active material layer; an external terminal connected to the electrode body; a nonaqueous electrolyte including a gas generant, and a current interrupt device. A content of the gas generant is at least 4 mass %. The positive-electrode active material layer includes, as a positive-electrode active material, a complex oxide containing' at least zirconium (Zr) and calcium (Ca) as constituent elements. When a sum total of metal elements, except metal that becomes a charge carrier, in the complex oxide is 100 mol % in terms of a mole percentage, the complex oxide contains Zr from 0.1 mol % to 0.5 mol % inclusive and Ca from 0.1 mol % to 0.3 mol % inclusive.

First claim

1 . A nonaqueous electrolyte secondary battery comprising:
an electrode body including
a positive electrode configured such that a positive-electrode active material layer is held in a positive current collector,
a negative electrode configured such that a negative-electrode active material layer is held in a negative current collector, and
a separator provided between the positive electrode and the negative electrode;
a case configured to accommodate the electrode body; an external terminal provided in the case, the external terminal being connected to the electrode body; a nonaqueous electrolyte accommodated in the case, the nonaqueous electrolyte including a gas generant configured to generate gas by causing a reaction at a predetermined voltage or more; and a current interrupt device configured to interrupt electrical connection between the electrode body and the external terminal when an internal pressure of the case reaches a predetermined pressure or more, a content of the gas generant being at least 4 mass % when a total mass of the nonaqueous electrolyte is 100 mass %, the positive-electrode active material layer including, as a positive-electrode active material, a complex oxide containing at least zirconium and calcium as constituent elements, and the complex oxide containing zirconium from 0.1 mol % to 0.5 mol % inclusive and calcium from 0.1 mol % to 0.3 mol % inclusive when a sum total of metal elements, except metal that is a charge carrier, in the complex oxide is 100 mol % in terms of a mole percentage.

2 . The nonaqueous electrolyte secondary battery according to claim 1 , wherein
the complex oxide contains zirconium from 0.1 mol % to 0.2 mol % inclusive when the sum total of the metal elements, except the charge carrier, in the complex oxide is 100 mol % in terms of a mole percentage.

3 . The nonaqueous electrolyte secondary battery according to claim 1 , wherein
the complex oxide has a layered crystal structure represented by General Formula:
Li x Ni a Co b Mn c Zr d Ca e Me f O 2   (1),

wherein x, a, b, c, d, e and f are numbers that satisfy all of the following relationships: 0.99≦x≦1.2, 0.9≦a+b+c+d+e+f≦1.1, 0<a≦0.5, 0<b≦0.5, 0<c≦0.5, 0.001≦d≦0.005, 0.001≦e≦0.003, and 0≦f≦0.01, and Me is not present or is one or more elements selected from transition metal elements, typical metal elements and boron.

4 . The nonaqueous electrolyte secondary battery according to claim 1 , wherein
the nonaqueous electrolyte contains, as the gas generant, cyclohexylbenzene and biphenyl.

Assignees

• Toyota Motor Co Ltd

Inventors

• Saka Hideyuki
• Takahashi Keiichi
• Fujita Hideaki

Classifications

• H01M10/0525 Primary

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

• C01G53/50

  of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/505

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

• C01P2002/50

  Solid solutions · CPC title