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Method for producing lithium manganate and lithium cell using said lithium manganate

A technology for producing lithium manganate and manganese oxide, applied in manganate/permanganate, battery electrodes, chemical instruments and methods, etc.

Inactive Publication Date: 2003-04-23
ISHIHARA SANGYO KAISHA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the above-mentioned difficulties in the prior art, the object of the present invention is to provide a method suitable for producing lithium manganate of high energy density lithium batteries with industrialization and economic advantages, said lithium manganate has a large particle diameter and exhibits High bulk density, uniform particle diameter and particle shape, less lattice defects and uniform composition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Synthesis of manganese hydroxide

[0035] In a reactor made of stainless steel, put 2.57 liters of 8.5 mol / liter sodium hydroxide solution and 1.805 liters of water. When nitrogen is blown into it at a speed of 5 liters / minute, 3.744kg of manganese sulfate (according to MnSO 4 The solution formed by dissolving in 15kg of water to carry out neutralization, and aging at 70° C. for 3 hours under stirring conditions to obtain manganese hydroxide. The residual manganese ion concentration in the neutralized solution was 30 g / L.

[0036] 2. Synthesis of MnO Seed Crystals

[0037] In the solution containing the manganese hydroxide obtained above, under stirring conditions, a gas mixture of air-nitrogen (1: 1) was blown into at a speed of 5 liters / min, and oxidation was carried out at 70 ° C. When the pH reached 6.4, Oxidation ends. Thus, manganese oxide seed crystals were prepared.

[0038] 3. Growth of manganese oxide seed crystals

[0039] When the solution containin...

Embodiment 2

[0049] 1. Synthesis of manganese hydroxide

[0050] Manganese hydroxide was obtained according to the same method as in Example 1.

[0051] 2. Synthesis of MnO Seed Crystals

[0052] Manganese oxide seed crystals were obtained according to the same method as in Example 1.

[0053] 3. Growth of manganese oxide seed crystals

[0054] The solution containing the manganese oxide seed crystals obtained above was heated to 70°C and a gas mixture of air-nitrogen (1:1) was blown thereinto at a rate of 5 liters / minute with stirring. Simultaneously, 3.744kg manganese sulfate (according to MnSO4) was added thereto within 16 hours 4content is 88.06%) dissolved in 16.843kg of water and 2.570 liters of 8.5 mol / liter sodium hydroxide solution, while keeping the pH value at 6.5-7.5 to neutralize and oxidize, so that the manganese oxide seed crystal grows Big. When the pH reached 6.4, 20 liters of the slurry was drawn out, and then while a gas mixture of air-nitrogen (1:1) was blown into ...

Embodiment 3

[0064] 1. Synthesis of manganese hydroxide

[0065] In the stainless steel reactor, put 3.744kg manganese sulfate (according to MnSO 4 The solution formed by dissolving in 16.84kg water. While nitrogen gas was blown into it at a rate of 5 liters / minute, the solution was heated to 70°C, and 2.57 liters of 8.5 mol / liter sodium hydroxide solution was added thereto within 1 hour with stirring to neutralize . The reaction mixture was then aged for 2 hours to obtain a solution containing manganese hydroxide. The residual manganese ion concentration in the neutralized solution was 30 g / L.

[0066] 2. Synthesis of MnO Seed Crystals

[0067] Manganese oxide seed crystals were obtained according to the same method as in Example 1.

[0068] 3. Growth of manganese oxide seed crystals

[0069] The solution containing the manganese oxide seed crystals obtained above was heated to 70° C., and then under stirring conditions, a gas mixture of air-nitrogen (1:1) was blown into it at a spe...

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Abstract

According to the process of this invention, first a manganese oxide seed is prepared, which is then grown to obtain manganese oxide having large particle diameters. The manganese oxide thus obtained is reacted with a lithium compound, whereby lithium manganate having large particle diameters can be obtained. Since the lithium manganate has large particle diameters and gives a high packing density, lithium batteries with a high energy density can be provided by using the lithium manganate.

Description

technical field [0001] The present invention relates to a method for producing lithium manganate, which is a compound used as a positive electrode material for a lithium battery, and to a lithium battery obtained by using the lithium manganate produced by the method. Background technique [0002] Lithium secondary batteries have come into widespread use in recent years because they have high voltage, excellent charge and discharge characteristics, and are light in weight and small in size, and especially those lithium secondary batteries with high electromotive force of 4-V class are strongly demanded. As such lithium secondary batteries, those using cobalt or a composite oxide of nickel and lithium as a positive electrode active material are known; but cobalt and nickel are expensive, and there is a problem that resources may be exhausted in the future. [0003] Lithium manganese oxide is a composite oxide of manganese and lithium, with the chemical formula LiMn 2 o 4 sai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/00C01G45/12H01M4/505
CPCC01P2006/12H01M4/505H01M4/58Y02E60/122C01P2006/40C01P2004/62C01G45/02C01G45/1221C01P2006/11C01P2004/61Y02E60/10C01G45/1242H01M4/50
Inventor 吹田德雄片冈健治
Owner ISHIHARA SANGYO KAISHA LTD
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