US 10,096,829 B2Granted

Nonaqueous electrolyte secondary batteries

AssigneeSanyo Electric Co., Ltd.

InventorsAtsushi Mizawa, Junichi Sugaya

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Abstract

A nonaqueous electrolyte secondary battery attains both a high capacity and excellent low-temperature characteristics. A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, a separator, a nonaqueous electrolyte and a battery case accommodating the battery constituents, the positive electrode having a positive electrode mixture layer including a lithium transition metal oxide and a conductive auxiliary, the lithium transition metal oxide containing at least Ni. The percentage of Ni in the total moles of metal element(s) except lithium present in the oxide is not less than 88 mol %, the content of the conductive auxiliary being not less than 0.75 parts by mass and not more than 1.25 parts by mass, the ratio of the lithium transition metal oxide being not less than 25 parts by volume in the inside of the battery case.

Claims8

Dependent claims

A nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, a separator, a nonaqueous electrolyte and a battery case accommodating the battery constituents, the positive electrode having a positive electrode mixture layer including a lithium transition metal oxide containing at least Ni, and a conductive auxiliary,

wherein the lithium transition metal oxide is an oxide represented by the general formula:
LiaNixM1−xO2 (wherein 0.95≤a≤1.2, 0.88≤x≤1.0, and M is at least one element selected from Co, Mn and Al).
the content of the conductive auxiliary being not less than 0.75 parts by mass and not more than 1.25 parts by mass per 100 parts by mass of the lithium transition metal oxide,
a volume of the lithium transition metal oxide obtained by multiplying a total mass of the lithium transition metal oxide by a true density of the lithium transition metal oxide being not less than 25% of a total volume of the inside of the battery case.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 15/126,056Filed 10 Mar 2015
Priority: JP 2014-06518927 Mar 2014
Published: US 2017/0084917 A123 Mar 2017
Granted: 9 Oct 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

H01M 4/525
Of nickel, cobalt or iron: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g.…
H01M 4/131
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
H01M 4/483
Of inorganic oxides or hydroxides: for non-aqueous cells
H01M 4/505
Of manganese: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy