Electrode material, electrode plate, lithium ion battery, manufacturing method for electrode material, and manufacturing method for electrode plate

Patent metadata

Field	Value
Publication number	US-9748563-B2
Application number	US-201314374032-A
Country	US
Kind code	B2
Filing date	Jan 22, 2013
Priority date	Jan 31, 2012
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

An electrode material of the present invention includes surface-coated Li x A y D z PO 4 particles obtained by coating surfaces of Li x A y D z PO 4 (in which, A represents one or more selected from the group consisting of Co, Mn, Ni, Fe, Cu and Cr, D represents one or more selected from the group consisting of Mg, Ca, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, Sc, Y and rare earth elements, 0<x≦2, 0<y≦1, and 0≦z≦1.5) particles with a carbonaceous coat, and an elution amount of Li is in a range of 200 ppm to 700 ppm and an elution amount of P is in a range of 500 ppm to 2000 ppm when the surface-coated Li x A y D z PO 4 particles are immersed in a sulfuric acid solution having a hydrogen-ion exponent of 4 for 24 hours.

First claim

We claim:

1. A manufacturing method for an electrode material,
wherein any one of surface-coated Li x A y D z PO 4 particles obtained by coating surfaces of Li x A y D z PO 4 particles with a carbonaceous coat, wherein A represents one or more selected from the group consisting of Co, Mn, Ni, Fe, Cu and Cr, D represents one or more selected from the group consisting of Mg, Ca, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, Sc, Y and rare earth elements, 0<x≦2, 0<y≦1, and 0≦z≦1.5, and agglomerated particles obtained by agglomerating a plurality of the surface-coated Li x A y D z PO 4 particles are thermally treated in a non-oxidizing atmosphere at a temperature in a range of 40° C. to 500° C. over 0.1 hours to 1000 hours,
wherein an elution amount of Li is in a range of 200 ppm to 700 ppm and an elution amount of P is in a range of 500 ppm to 2000 ppm when the surface-coated Li x A y D z PO 4 particles are immersed in a sulfuric acid solution having a hydrogen-ion exponent of 4 for 24 hours.

2. A manufacturing method for an electrode plate,
wherein a positive electrode material layer containing any one of surface-coated Li x A y D z PO 4 particles obtained by coating surfaces of Li x A y D z PO 4 particles with a carbonaceous coat wherein A represents one or more selected from the group consisting of Co, Mn, Ni, Fe, Cu and Cr, D represents one or more selected from the group consisting of Mg, Ca, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, Sc, Y and rare earth elements, 0<x≦2, 0<y≦1, and 0≦z≦1.5, and agglomerated particles obtained by agglomerating a plurality of the surface-coated Li x A y D z PO 4 particles is formed on a collector, and then an electrode plate having the positive electrode material layer formed on the collector is thermally treated in a non-oxidizing atmosphere at a temperature in a range of 40° C. to 500° C. over 0.1 hours to 1000 hours,
wherein an elution amount of Li is in a range of 200 ppm to 700 ppm and an elution amount of P is in a range of 500 ppm to 2000 ppm when the surface-coated Li x A y D z PO 4 particles are immersed in a sulfuric acid solution having a hydrogen-ion exponent of 4 for 24 hours.

3. A manufacturing method for an electrode material comprising:
stirring surface-coated Li x A y D z PO 4 particles, wherein A represents one or more selected from the group consisting of Co, Mn, Ni, Fe, Cu and Cr, D represents one or more selected from the group consisting of Mg, Ca, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, Sc, Y and rare earth elements, 0<x≦2, 0<y≦1, and 0≦z≦1.5, with a carbonaceous coat in a sulfuric acid solution having a mass that is 10 times the mass of the particles and a pH of 4 at 25° C.;
immersing the surface-coated Li x A y D z PO 4 particles at 25° C. for 24 hours; and
measuring the elution amount of Li and the elution amount of P eluted from the surface-coated Li x A y D z PO 4 particles into the sulfuric acid solution by inductively coupled plasma spectrometry after the 24 hours.

Assignees

• Sumitomo Osaka Cement Co Ltd

Inventors

• Yamazaki Akinori
• Yamamoto Yoshitaka
• Kitagawa Takao
• Yasumiishi Hirofumi

Classifications

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/0525

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

• H01M4/1391

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