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Lithium transition metal-based compound powder for positive electrode material in lithium rechargeable battery, method for manufacturing the powder, spray dried product of the powder, firing precursor

A lithium secondary battery, lithium transition metal technology, applied in battery electrodes, circuits, electric vehicles, etc.

Inactive Publication Date: 2009-03-04
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the content of Mo is too high, there is still a problem that an active material with well-balanced various battery characteristics cannot be obtained.

Method used

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  • Lithium transition metal-based compound powder for positive electrode material in lithium rechargeable battery, method for manufacturing the powder, spray dried product of the powder, firing precursor
  • Lithium transition metal-based compound powder for positive electrode material in lithium rechargeable battery, method for manufacturing the powder, spray dried product of the powder, firing precursor
  • Lithium transition metal-based compound powder for positive electrode material in lithium rechargeable battery, method for manufacturing the powder, spray dried product of the powder, firing precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0819] Weigh Li 2 CO 3 , Ni(OH) 2 , Mn 3 o 4 , the molar ratio is Li:Ni:Mn=1.267:0.250:0.583, after mixing, add pure water to prepare slurry. While stirring the slurry, the solid components in the slurry were pulverized to a median particle size of 0.16 μm with a circulating medium agitation type wet pulverizer.

[0820] Put about 15 g of the granular powder obtained by spray-drying the slurry with a spray dryer into an alumina crucible, and calcine it at 950°C for 12 hours in an air atmosphere (heating rate 5°C / min). , crushed to obtain a volume resistivity of 3.7×10 6 Ω·cm, the carbon content is 0.092% by weight, and the composition is Li 1.088 (Li0.167 Ni 0.254 mn 0.579 )O 2 The lithium nickel manganese composite oxide (x=0.167, y=0, z=0.088). Its average primary particle size is 0.2 μm, median particle size is 1.7 μm, 90% cumulative particle size (hereinafter, sometimes also referred to as D 90 ) is 3.6μm, the bulk density is 0.8g / cc, and the BET specific surfac...

Embodiment 2

[0822] Weigh Li 2 CO 3 , Ni(OH) 2 , Mn 3 o 4 , the molar ratio is Li:Ni:Mn=1.267:0.250:0.583, after mixing, add pure water to prepare slurry. While stirring the slurry, the solid content in the slurry was pulverized to a median particle size of 0.16 μm with a circulating medium agitation type wet pulverizer.

[0823] Put about 15 g of the granular powder obtained by spray-drying the slurry with a spray dryer into an alumina crucible, and calcine it at 1000°C for 12 hours in an air atmosphere (temperature rise and fall rate 5°C / min). , crushed to obtain a volume resistivity of 9.2×10 5 Ω·cm, the carbon content is 0.059% by weight, and the composition is Li 1.067 (Li 0.167 Ni 0.254 mn 0.579 )O 2 The lithium nickel manganese composite oxide (x=0.167, y=0, z=0.067). Its average primary particle size is 0.5 μm, median particle size is 3.6 μm, D 90 It is 4.6μm, the bulk density is 1.0g / cc, and the BET specific surface area is 2.1m 2 / g.

Embodiment 3

[0825] Weigh Li 2 CO 3 , Ni(OH) 2 , Mn 3 o 4 , the molar ratio is Li:Ni:Mn=1.211:0.333:0.556, after mixing, add pure water to prepare slurry. While stirring the slurry, the solid components in the slurry were pulverized to a median particle size of 0.17 μm with a circulating medium agitation type wet pulverizer.

[0826] Put about 15 g of the granular powder obtained by spray-drying the slurry with a spray dryer into an alumina crucible, and calcine it at 900°C for 12 hours in an air atmosphere (temperature rise and fall rate 5°C / min). , crushed to obtain a volume resistivity of 2.0×10 5 Ω·cm, the carbon content is 0.084% by weight, and the composition is Li 1.066 (Li 0.111 Ni 0.334 mn 0.555 )O 2 The lithium nickel manganese composite oxide (x=0.111, y=0, z=0.066). Also, it was confirmed that the crystal structure was composed of a layered R(-3)m structure. Its average primary particle size is 0.2 μm, median particle size is 2.7 μm, D 90 It is 5.1μm, the bulk dens...

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Abstract

This invention provides a lithium transition metal-based compound powder for a positive electrode material in a lithium rechargeable battery, which, when used as a positive material for a lithium rechargeable battery, can simultaneously realize cost reduction, resistance to high voltage, high safety, and battery performance improvement. The lithium transition metal-based compound powder for a positive electrode material in a lithium rechargeable battery is characterized in that, in a mercury penetration curve obtained by a mercury penetration method, the mercury penetration level in a pressure rise from 3.86 kPa to 413 MPa is not less than 0.8 cm<3> / g and not more than 3 cm<3> / g.

Description

technical field [0001] The present invention relates to a lithium transition metal compound powder used as a lithium secondary battery positive electrode material, a production method thereof, a spray-dried body and a calcined precursor, and a lithium secondary battery positive electrode using the lithium transition metal compound powder And a lithium secondary battery having the positive electrode for the lithium secondary battery. Background technique [0002] Since lithium secondary batteries are excellent in energy density and output power density, and can be effectively reduced in size and weight, demand for them as a power source for portable devices such as notebook computers, mobile phones, and camcorders is rapidly increasing. Lithium secondary batteries are also attracting attention as power sources for electric vehicles and electric load regulation, etc., and in recent years, demand as a power source for hybrid electric vehicles has rapidly expanded. Especially i...

Claims

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Application Information

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IPC IPC(8): H01M4/50H01M4/52
CPCY02T10/7011Y02E60/10
Inventor 志塚贤治冈原贤二伊村宏之寺田薰
Owner MITSUBISHI CHEM CORP
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