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Layered lithium nickel composite oxide powder and process for producing the same

A technology for composite oxides and manufacturing methods, applied in nickel compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of insufficient battery performance in rate characteristics and output characteristics, and achieve excellent initial charge and discharge characteristics and high-speed discharge characteristics Effects of excellent, excellent rate characteristics and output characteristics

Active Publication Date: 2005-11-16
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this case, since the growth of the primary particles is accelerated, when such a lithium-nickel-based composite oxide powder is used, there is a problem of insufficient battery performance such as rate characteristics and output characteristics.

Method used

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  • Layered lithium nickel composite oxide powder and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] With Ni(OH) 2 , Mn 3 o 4 、Co(OH) 2 As a starting material, it was weighed so that the molar ratio of Ni:Mn:Co was 0.33:0.33:0.33, and pure water was added thereto to prepare a slurry. The slurry was pulverized until the average particle size of the solids was 0.15 μm by stirring with a circulating medium agitation type wet pulverizer (Dyno Mill KDL-A type manufactured by Synmasu Entera-Plaise Co., Ltd.).

[0110] Next, this slurry (solid content: 17% by weight, viscosity: 810 cp) was spray-dried using a two-fluid nozzle type spray dryer (manufactured by Okawara Chemical Equipment Co., Ltd.: LT-8 type). The spray nozzle used is an external mixing nozzle. Among the concentric nozzles, the inner side is the slurry outlet, and the outer side is the pressurized gas outlet. The outer diameter of the nozzle is 3mm, the diameter of the slurry outlet is 2.3mm, and the pressurized gas flow The gap of the outlet is 0.2mm, and the cross-sectional area is 1.76mm 2 . At this ti...

Embodiment 2

[0114] Use a slurry whose average particle size of solids is pulverized to 0.17 μm, and set the solids content of the slurry to 15.5% by weight, viscosity to 960 cp, and dry gas introduction amount G to 45 L / min in spray drying by a spray dryer. , The gas linear velocity is 426m / sec, the slurry introduction amount S is 39g / min (gas / slurry ratio G / S is 1.15), the drying inlet temperature is 90°C, and the powder is mixed with the pulverized LiOH powder About 256 g was put into a rectangular crucible made of alumina, and baked at 950° C. for 12 hours under an air flow of 9 L / min. Then pulverize and bake at 950°C for another 12 hours. In addition, the same operation as in Example 1 is performed to obtain a layered structure composed of Li 1.05 Ni 0.33 mn 0.33 co 0.33 o 2 lithium nickel manganese cobalt composite oxide powder.

[0115] Table 1 shows the values ​​of the physical properties of the powder measured by the same method as in Example 1.

Embodiment 3

[0117] Use a slurry whose average particle size of solids is pulverized to 0.13 μm, and set the solids content of the slurry to 16% by weight, viscosity to 900 cp, and dry gas introduction amount G to 30 L / min in spray drying by a spray dryer. , the gas linear velocity is 284m / sec, the slurry introduction amount S is 35g / min (the gas / slurry ratio G / S is 0.86), the drying inlet temperature is 90°C, in addition, the same operation as in Example 1 is obtained to have a layered structure The composition is Li 1.05 Ni 0.33 mn 0.33 co 0.33 o 2 lithium nickel manganese cobalt composite oxide powder.

[0118] Table 1 shows the values ​​of the physical properties of the powder measured by the same method as in Example 1.

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Abstract

A layered lithium-nickel-based compound oxide powder for a positive electrode material for a high density lithium secondary cell, capable of providing a lithium secondary cell having a high capacity and excellent in the rate characteristics also, is provided. A layered lithium-nickel-based compound oxide powder for a positive electrode material for a lithium secondary cell, characterized in that the bulk density is at least 2.0 g / cc, the average primary particle size B is from 0.1 to 1 mum, the median diameter A of the secondary particles is from 9 to 20 mum, and the ratio A / B of the median diameter A of the secondary particles to the average primary particle size B, is within a range of from 10 to 200. In production of a layered lithium-nickel-based compound oxide powder, which comprises spray drying a slurry having a nickel compound and a transition metal element compound capable of substituting lithium other than nickel, dispersed in a liquid medium, followed by mixing with a lithium compound, and firing the mixture, the spray drying is carried out under conditions of 0.4<=G / S<=4 and G / S<=0.0012 V, when the slurry viscosity at the time of the spray drying is represented by V (cp), the slurry supply amount is represented by S (g / min) and the gas supply amount is represented by G (L / min).

Description

technical field [0001] The present invention relates to a layered lithium nickel-based composite oxide powder used as a positive electrode material for a lithium secondary battery, a method for producing the same, a positive electrode for a lithium secondary battery and a lithium secondary battery using the layered lithium nickel-based composite oxide powder. Specifically, the present invention relates to a layered lithium nickel-based composite oxide powder for a high-density lithium secondary battery positive electrode material capable of providing a lithium secondary battery having a high capacity and excellent rate characteristics, a method for producing the same, and a lithium battery using the above-mentioned material. A positive electrode for a secondary battery and a lithium secondary battery. Background technique [0002] Lithium secondary batteries have characteristics such as excellent energy density and output density, and can achieve miniaturization and light we...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/122Y02E60/10
Inventor 志塚贤治
Owner MITSUBISHI RAYON CO LTD
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