Positive electrode active substance particles for non-aqueous electrolyte secondary batteries and process for producing the same, and non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-2017194626-A1
Application number	US-201515314736-A
Country	US
Kind code	A1
Filing date	Jun 25, 2015
Priority date	Jun 26, 2014
Publication date	Jul 6, 2017
Grant date	—

Abstract

An object of the present invention is to provide positive electrode active substance particles for non-aqueous electrolyte secondary batteries which are excellent in D.C. resistance characteristics under low-temperature conditions and a process for producing the provide positive electrode active substance particles, and a non-aqueous electrolyte secondary battery. The present invention relates to positive electrode active substance particles for non-aqueous electrolyte secondary batteries, comprising lithium composite oxide particles having a layered rock salt structure which are chemically reacted with at least Li and comprise at least one element selected from the group consisting of Ni, Co and Mn, and tungsten oxide particles, in which W is present in an amount of 0.1 to 4.0 mol % based on a total molar amount of Ni, Co and Mn in the lithium composite oxide particles, and the tungsten oxide particles have an average secondary particle diameter of 0.1 to 3.0 μm.

First claim

1 . Positive electrode (cathode) active substance particles for non-aqueous electrolyte secondary batteries, comprising:
lithium composite oxide particles having a layered rock salt structure which are chemically reacted with at least Li and comprise at least one element selected from the group consisting of Ni, Co and Mn, and tungsten oxide particles, in which W is present in an amount of 0.1 to 4.0 mol % based on a total molar amount of Ni, Co and Mn in the lithium composite oxide particles, and the tungsten oxide particles have an average secondary particle diameter of 0.1 to 3.0 μm.

2 . The positive electrode active substance particles for non-aqueous electrolyte secondary batteries according to claim 1 , wherein a secondary battery comprising a positive electrode using the positive electrode active substance particles and a counter electrode using metallic lithium has an improvement ratio of a D.C. resistance of not less than 5% as measured by controlling a state of charge (SOC) of the secondary battery to 20% at an ambient temperature of −10° C.

3 . A process for producing the positive electrode active substance particles for non-aqueous electrolyte secondary batteries according to claim 1 , comprising the step of mixing lithium composite oxide particles having a layered rock salt structure which are chemically reacted with at least Li and comprise at least one element selected from the group consisting of Ni, Co and Mn, and tungsten oxide particles, in which the tungsten oxide particles have an average secondary particle diameter of 0.1 to 3.0 μm; an average secondary particle diameter of the tungsten oxide particles is not less than 0.02 time and not more than 0.75 time an average secondary particle diameter of the lithium composite oxide particles; and tungsten oxide is added such that W is present in an amount of 0.1 to 4.0 mol % based on a total molar amount of Ni, Co and Mn in the lithium composite oxide particles.

4 . A non-aqueous electrolyte secondary battery using the positive electrode active substance particles for non-aqueous electrolyte secondary batteries according to claim 1 .

Assignees

• Toda Kogyo Corp

Inventors

• Yamamura Takayuki
• Kashima Tetsuya
• Masaki Ryuta
• Koga Kazumichi

Classifications

• H01M4/523

  for non-aqueous cells (H01M4/525 takes precedence) · CPC title

• C01P2004/82

  two phases having the same anion, e.g. both oxidic phases · CPC title

• C01G53/50

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

• H01M4/505

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

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title