Preparation method of lambada-MnO2

A technology of manganese oxide and lithium salt, which is applied in the field of MnO2 preparation, can solve the problems of high consumables, low product purity, time and energy consumption, etc., and achieve the effect of regular surface morphology, good discharge performance and uniform distribution

Inactive Publication Date: 2008-07-02
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for a long time, the internationally popular λ-MnO 2 The preparation methods are all dilute acid treatment methods. The yield of this method is very low, time-consuming and energy-consuming, and the consumables are high, the production conditions are difficult to control, and the product quality is unstable.
At home and abroad in the 1990s, there was an electrolysis method to extract lithium from lithium manganate to prepare λ-MnO. 2 method, but the obtained product has low purity, and can only be regarded as lithium-poor lithium manganese oxide, and its performance is not good
Due to the impossibility of large-scale preparation of λ-MnO with high purity and good quality 2 , which seriously affects the λ-MnO 2 practical application of

Method used

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  • Preparation method of lambada-MnO2
  • Preparation method of lambada-MnO2
  • Preparation method of lambada-MnO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh LiCO at a molar ratio of 1:4 3 and about 500g of EMD, and grind for 2h with a ball mill to mix the two materials evenly. Prepare the sample and put in Al 2 o 3 Put the crucible in a muffle furnace and smelt it at 600°C for 12 hours in an air atmosphere, cool it naturally, take out the sample, crush it, and mill it with a ball mill for 2 hours, then put it in a muffle furnace again and smelt it at 800°C in an air atmosphere for 24 hours , cooled naturally, the product was taken out, crushed and ball milled to 8-12 μm to obtain lithium manganese oxide.

[0023] Weigh 120g of lithium manganese oxide prepared by the above-mentioned method and disperse it in 200ml of deionized water, and keep the temperature of the mixture at 25°C in a water bath while continuously stirring vigorously. Take 140ml of 10M sulfuric acid and inject it dropwise into the mixture, keeping the temperature of the mixture at 25°C all the time until the pH value of the mixture is stabilized wi...

Embodiment 2

[0025] Weigh LiNO at a molar ratio of 1:2 3 and about 500g of EMD, add 100ml of ethanol as a dispersant, and mill in a ball mill for 2 hours to mix the two materials evenly. Prepare the sample and put in Al 2 o 3 The crucible is placed in a muffle furnace and smelted at 450°C for 16 hours in an air atmosphere, cooled, the sample is taken out, crushed and ball milled for 4 hours, placed in a muffle furnace again and smelted at 800°C for 20 hours in an air atmosphere, cooled, The product is taken out, pulverized and ball-milled to 8-12 μm to obtain lithium manganese oxide.

[0026] Weigh 120g of lithium manganese oxide prepared by the above-mentioned method and disperse it in 200ml of deionized water, and keep the temperature of the mixture at 20°C in a water bath while continuously stirring vigorously. Take 200ml of 15M concentrated nitric acid and inject it dropwise into the mixture, keeping the temperature of the mixture at 20°C until the pH value of the mixture is stabili...

Embodiment 3

[0028] Weigh about 500 g of LiOH and CMD at a molar ratio of 1:2, and mill them in a ball mill for 4 hours to mix the two materials evenly. Prepare the sample and put in Al 2 o 3The crucible is placed in a muffle furnace and smelted at 350°C for 10 hours in an air atmosphere, cooled, the sample is taken out, pulverized and ball milled for 2 hours, placed in a muffle furnace again and smelted at 750°C for 24 hours in an air atmosphere, cooled, The product is taken out, pulverized and ball-milled to 8-12 μm to obtain lithium manganese oxide.

[0029] Weigh 120g of lithium manganese oxide prepared by the above-mentioned method and disperse it in 200ml of deionized water, and keep the temperature of the mixture at 20°C in a water bath while continuously stirring vigorously. Take 200ml of 15M concentrated hydrochloric acid and inject it dropwise into the mixture, keeping the temperature of the mixture at 20°C until the pH value of the mixture is stabilized within 0.5-1. Continue...

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Abstract

The invention discloses a preparation method of Lambada -MnO2. 1) Manganese oxide and lithium salt are evenly mixed according to the molar ratio of 0.5:1-1:8; 2) The mixture solid phase reacts for 1-48h at the temperature of 200-800 DEG C; 3) after being cooled, the mixture is crushed and mixed evenly; 4) The mixture solid phase reacts for 1-72h at the temperature of 200-1000 DEG C; 5) after being crushed, the mixture passes 100-400 mesh screen and lithium manganese oxide is obtained; 6) The lithium manganese oxide and deionized water are mixed and well stirred according to weight ratio of 1:1-1:10 to get suspension liquid; 7) acid with concentration of 1-2Omol / L is infused into the mixture under the rotation speed of 400-4000 revolution / minute and at the temperature of 5-40 DEG C until the pH value is between 0 and 3, and the mixture liquid phase reacts for 1-48h, filtered and cleaned to get filter cake; 8) the filter cake is dried at the temperature of 40-130 DEG C for 1-48h to obtain Lambada -MnO2. The method has high yield when dealing with lithium manganese oxide, the purity of product is more than 95 percent and water content is less than 1.5 percent. The Lambada -MnO2 obtained has perfect spinel structure, regular appearance, comparatively small particle size, even distribution and good discharge performance. Therefore, the method is a novel and practical technology for preparing Lambada -MnO2.

Description

technical field [0001] The present invention relates to a kind of MnO 2 method of preparation. Background technique [0002] The energy problem is a common problem faced by mankind in the 21st century. Electric energy is the most convenient form of energy. In order to store electric energy and meet the needs of the rapid development of the electronics industry and the development of electric vehicles, various types of batteries have emerged as the times require. Since Sanyo invented Li / MnO in 1975 2 Since the battery, because of its environmental friendliness, high energy density, long storage life and ability to work under severe conditions, it has been widely used in the electronics industry, IT industry, communication industry and other fields. Electrical and electronic instruments provide a wide range of power sources and also meet the special needs of the military field. Currently, increasing Li / MnO 2 The work on battery performance is mainly focused on enhancing hi...

Claims

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Application Information

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IPC IPC(8): C01G45/02H01M4/50
CPCY02E60/10
Inventor 王先友胡涛
Owner XIANGTAN UNIV
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