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Preparation method of composite MnO2 anode material for chargeable Li-Mn battery

A positive electrode material, lithium-manganese battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of rare rechargeable composite MnO2 research, rare battery industrial development, etc., to improve the charging and discharging effect, 3V platform Stable, homogeneous effect

Inactive Publication Date: 2010-06-23
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In general, domestic and foreign research on how to prepare high-performance rechargeable composite MnO 2 There are not many studies, and the 3V can charge Li / MnO 2 The industrial development of batteries is even rarer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Commercially available electrolytic MnO with γ-crystal form and an average grain diameter of 30 μm 2 Soak in 1M sulfuric acid aqueous solution at 40°C for 10 hours, sulfuric acid solution and MnO 2 The weight ratio is 1:5. Then the suspension was filtered through a plastic plate and frame filter press to filter out MnO 2 Solid, washed 3 times with water until the solution does not contain sulfate ions. The weight ratio of water and wet materials during washing is 1:3. The washed material is made into a suspension again according to the weight ratio of water and wet material at 1:3, and is ground by a high-speed rotating colloid mill.

[0021] The MnO after the above steps 2 Add AEO (fatty alcohol polyoxyethylene ether) with a weight ratio of 0.3% to the / water slurry, stir evenly, put it into a sealed reaction kettle, heat the material to 120° C., and keep the temperature constant for 3 hours in the stirring state. Cool down to below 70°C, filter through plastic pl...

Embodiment 2

[0023] Commercially available electrolytic MnO with γ crystal form and an average grain diameter of 50 μm 2 Soak in 3M sulfuric acid aqueous solution at 50°C for 15 hours, the weight ratio of sulfuric acid solution and manganese dioxide is 1:5. Then the suspension was filtered through a plastic plate and frame filter press to filter out MnO 2Solid, washed 5 times with water until the solution does not contain sulfate ions. The weight ratio of water and wet materials during washing is 1:3. The washed material is made into a suspension again according to the weight ratio of water and wet material at 1:3, and is ground by a high-speed rotating colloid mill.

[0024] The MnO after the above steps 2 Add Tween (polyoxyethylene sorbitan fatty acid ester) with a weight ratio of 0.5% to the / water slurry, stir evenly, put into a sealed reaction kettle, heat the material to 140° C., and keep the temperature constant for 5 hours in the stirring state. Cool down to below 70°C, filter ...

Embodiment 3

[0026] Commercially available electrolytic MnO with γ crystal form and an average grain diameter of 40 μm 2 Soak in 2M sulfuric acid aqueous solution at 45°C for 12 hours, sulfuric acid solution and MnO 2 The weight ratio is 1:5. Then the suspension was filtered through a plastic plate and frame filter press to filter out MnO 2 Solid, washed 4 times with water until the solution does not contain sulfate ions. The weight ratio of water and wet materials during washing is 1:3. The washed material is made into a suspension again according to the weight ratio of water and wet material at 1:3, and is ground by a high-speed rotating colloid mill.

[0027] The MnO after the above steps 2 Add OP (alkylphenol polyoxyethylene ether) with a weight ratio of 0.4% to the / water slurry, stir evenly, put it into a sealed reaction kettle, heat the material to 130° C., and keep the temperature constant for 4 hours in the stirring state. Cool down to below 70°C, filter through plastic plate...

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Abstract

The invention provides a preparation method of composite MnO2 anode material for a chargeable Li-Mn battery and relates to a manufacturing method of electrode material; finished products are manufactured by the steps of purification of raw material, calcining and refining and reactive sintering; the method comprises the following steps: merchant electrolysis MnO2 material is acid-dipped and then is filtered and cleaned, and the washed material is ground finely; and then nonionic surface active agents with 0.3-0.5 percent of weight ratio are added, the mixture is heated to 120-140 DEG C in a sealing agitated reactor, and the temperature is kept for 3-5 hours, after the temperature is reduced, the reaction material is filtered and dried, and the dried material is placed in an electric furnace for calcining; the calcined MnO2 and chemically pure lithium nitrate are mixed with 1:(0.3-0.4) of molar ratio, the mixture is ground in a dry state, and then is sintered for 10-24 hours at 260-400DEG C under atmosphere, and then dry ball-milling and sieving are carried out to obtain the needed composite MnO2 material.

Description

technical field [0001] The technical solution of the invention relates to a method for manufacturing an electrode material, in particular to a method for preparing a composite manganese dioxide as a positive electrode material for a rechargeable lithium-manganese battery. Background technique [0002] Manganese dioxide (MnO 2 ) is an important battery cathode material. Contains MnO 2 A large amount of natural pyrolusite can be directly used to manufacture zinc-manganese dry batteries. Alkaline zinc-manganese batteries mainly use electrolytic MnO 2 or active MnO 2 make. Electrolytic MnO 2 or Li / MnO 2 The main cathode material of the battery. Li / MnO 2 Mainly button-type disposable batteries are widely used in low-current electrical products such as hearing aids, car keys, electronic watches, and remote controls. Various domestic models of Li / MnO 2 The total annual output of primary button batteries exceeds 1 billion. [0003] in MnO 2 In the positive battery system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02H01M4/50
CPCY02E60/12Y02E60/10
Inventor 梁广川王丽李青海郝德利
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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