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Lithium composite oxide particle for positive electrode material of lithium secondary battery, and lithium secondary battery positive electrode and lithium secondary battery using the same

A composite oxide and lithium secondary battery technology, applied in secondary batteries, battery electrodes, active material electrodes, etc., can solve the problems of reducing the filling efficiency of positive electrode active materials and limiting battery capacity, etc., and achieve excellent low-temperature load characteristics, excellent Coatability, effect of improving low temperature load characteristics

Active Publication Date: 2006-11-01
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, microparticles of lithium-transition metal composite oxides also reduce the filling efficiency of cathode active materials into the cathode and limit battery capacity.

Method used

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  • Lithium composite oxide particle for positive electrode material of lithium secondary battery, and lithium secondary battery positive electrode and lithium secondary battery using the same
  • Lithium composite oxide particle for positive electrode material of lithium secondary battery, and lithium secondary battery positive electrode and lithium secondary battery using the same
  • Lithium composite oxide particle for positive electrode material of lithium secondary battery, and lithium secondary battery positive electrode and lithium secondary battery using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0215] Weigh NiO, Co(OH) as nickel, cobalt and manganese raw materials respectively 2 and Mn 3 o 4 so that the molar ratio of Ni:Co:Mn is 0.33:0.33:0.33. Pure water was added to the weighed raw materials to prepare a slurry. Then, under stirring, the slurry was wet pulverized by a circulating medium agitation type wet bead mill until the average particle diameter of the solid matter in the slurry was 0.3 μm.

[0216] The slurry was then spray-dried in a spray dryer to form roughly spherical granulated particles with a diameter of about 5 μm and composed of nickel, cobalt and manganese raw materials. LiOH powder having a median particle diameter of 3 μm was added to the granulated particles thus obtained so that the molar ratio of Li was 1.05 relative to the total moles of Ni, Co and Mn, followed by mixing with a high-speed stirrer. Thereby, a mixture powder of granulated particles of nickel, cobalt and manganese raw materials and lithium raw material can be obtained.

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Embodiment 2

[0219] Weigh NiO, Co(OH) as nickel, cobalt, manganese and lithium raw materials respectively 2 and Mn 3 o 4 and LiOH·H 2 O, so that the molar ratio of Ni:Co:Mn:Li is 0.33:0.33:0.33:0.05. Pure water was added to the weighed raw materials to prepare a slurry. Then, the slurry was wet pulverized with a circulating medium agitation type wet bead mill under stirring until the average particle diameter of the solid matter was 0.20 μm.

[0220] The slurry was then spray dried with a spray dryer to form roughly spherical granulated particles with a diameter of about 6 μm and composed of nickel, cobalt, manganese and lithium raw materials. LiOH powder having a median diameter of 3 μm was added to the granulated particles thus obtained so that the molar ratio of Li was 1.00 relative to the total moles of Ni, Co and Mn, followed by mixing with a high-speed stirrer. Thereby, a mixture powder of granulated particles made of Ni, Co, Mn and lithium raw material and lithium raw material ...

Embodiment 3

[0222] Except for using CoOOH as the cobalt raw material, operations were carried out in the same manner as in Example 2, thereby obtaining lithium composite oxide particles (hereinafter referred to as "lithium composite oxide particles of Example 3").

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Abstract

An improved positive electrode material for lithium secondary battery that enhances the low temperature load characteristics of battery and further enhances coatability at the fabrication of positive electrode. In the measurement according to the mercury penetration method, the following condition (A) is satisfied and simultaneously at least one of the following conditions (B) and (C) is satisfied. Condition (A) On the mercury penetration curve, the quantity of mercury penetration at a pressure increase from 50 MPa to 150 MPa is 0.02 cm<3> / g or less. Condition (B) On the mercury penetration curve, the quantity of mercury penetration at a pressure increase from 50 MPa to 150 MPa is 0.01 cm<3> / g or more. Condition (C) The average pore radius is in the range of 10 to 100 nm, and further the pore distribution curve has a main peak whose peak top exists at a pore radius ranging from 0.5 to 50 mum and a subpeak whose peak top exists at a pore radius ranging from 80 to 300 nm.

Description

technical field [0001] The present invention relates to lithium composite oxide particles used as positive electrode materials for lithium secondary batteries, and also relates to positive electrodes for lithium secondary batteries and lithium secondary batteries using the positive electrodes. The positive electrode material according to the present invention exhibits excellent coatability, and can provide a positive electrode for a secondary battery having excellent load characteristics even when used in a low-temperature environment. Background technique [0002] Recently, lithium secondary batteries have attracted attention due to their use as power sources for miniaturized and lightweight mobile electronic devices and mobile communication devices and as power sources for vehicles. Lithium secondary batteries usually provide high output and high energy density. For the positive electrode, the standard composition is LiCoO 2 , LiNiO 2 , LiMn 2 o 4 The lithium transitio...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/02H01M10/40
CPCY02E60/10
Inventor 岛耕司
Owner MITSUBISHI RAYON CO LTD
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