Electrode material for lithium-ion secondary battery and method for manufacturing the same, electrode for lithium-ion secondary battery, and lithium-ion secondary battery

Patent metadata

Field	Value
Publication number	US-10431817-B2
Application number	US-201715716883-A
Country	US
Kind code	B2
Filing date	Sep 27, 2017
Priority date	Mar 24, 2017
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

An electrode material includes an inorganic particle and a carbonaceous film coating a surface of the inorganic particle, in which an amount of carbon is 0.8 to 2.5% by mass, and volume of micropores in a micropore diameter range of 2 to 200 nm is 3×10 −2 to 3×10 −1 cm 3 /g. A method for manufacturing an electrode material includes a step of immersing the inorganic particle in an aqueous solution, a step of producing a slurry including the inorganic particle immersed in an aqueous solution, a carbonaceous film precursor, and water, a step of producing a dried substance of the slurry, and a step of calcinating the dried substance in a non-oxidative atmosphere, in which an amount of the carbonaceous film precursor blended into the inorganic particle is 1.0 to 5.0 parts by mass. A lithium-ion secondary battery includes a cathode that is the electrode; an anode; and a non-aqueous electrolyte.

First claim

What is claimed is:

1. An electrode material for a lithium-ion secondary battery comprising:
an inorganic particle represented by General Formula LiFe x Mn 1-x-y M y PO 4 (0.02≤x≤1.0, 0≤y·0.14, here, M represents at least one element selected from Mg, Ca, Co, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, and rare earth elements); and
a carbonaceous film that coats a surface of the inorganic particle,
wherein an amount of carbon is 0.8% by mass or more and 2.5% by mass or less, and
the carbonaceous film having a volume of micropores in a micropore diameter range of 2 nm or more and 200 nm or less is 3×10 −2 cm 3 /g or more and 3×10 −1 cm 3 /g or less.

2. The electrode material for a lithium-ion secondary battery according to claim 1 ,
wherein a powder resistance is 1,000 Ω·cm or less.

3. The electrode material for a lithium-ion secondary battery according to claim 2 ,
wherein a value of D3/D1 measured by means of Raman spectrometry is 0.58 or more and 0.67 or less;
wherein D3 is the height between crests of G band and D band peaks appearing near 550 to 680 cm −l in a visible light laser at a wavelength of 532 nm, and D1 is the height of a D band peak appearing near 1,200 to 1,400 cm −1 in the visible light laser at a wavelength of 532 nm.

4. An electrode for a lithium-ion secondary battery comprising:
the electrode material for a lithium-ion secondary battery according to claim 1 .

5. A lithium-ion secondary battery comprising:
a cathode;
an anode; and
a non-aqueous electrolyte,
wherein the cathode is the electrode for a lithium-ion secondary battery according to claim 4 .

6. A method for manufacturing the electrode material for a lithium-ion secondary battery according to claim 1 , the method comprising:
a step of immersing an inorganic particle represented by General Formula LiFe x Mn 1-x-y M y PO 4 (0.05≤x≤1.0, 0≤y≤0.14, here, M represents at least one element selected from Mg, Ca, Co, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, and rare earth elements) in an aqueous solution having a pH of 7.3 or more and 10.0 or less;
a step of producing a slurry including the inorganic particle immersed in the aqueous solution, a carbonaceous film precursor, and water;
a step of producing a dried substance of the slurry by drying the slurry; and
a step of calcinating the dried substance in a non-oxidative atmosphere of 500° C. or higher and 1,000° C. or lower,
wherein an amount of the carbonaceous film precursor blended into 100 parts by mass of the inorganic particle in terms of a carbon element is 1.0 part by mass or more and 5.0 parts by mass or less.

Assignees

• Sumitomo Osaka Cement Co Ltd

Inventors

• Yasumiishi Hirofumi
• Yamaya Ryuuta

Classifications

• H01M4/366 Primary

  as layered products · CPC title

• H01M2004/021

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

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M4/1397

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

• H01M4/136

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