Preparation method of multivalent lithium manganese oxide

A technology of lithium manganese oxide and carbon dioxide, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of high charging potential and poor cycle stability, and achieve the effect of improving cycle durability and cycle stability

Inactive Publication Date: 2015-08-26
ZHANGJIAGANG SMARTGRID FANGHUA ELECTRICAL ENERGY STORAGE RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

layered structure Li 2 MnO 3 Such materials, the actual specific capacity is about 200mAh / g, the charging potential is too high, and the cycle stability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The manganese source used in the synthesis is LiMn 2 o 4 , the lithium source used for synthesis is lithium carbonate. Weigh 10g of LiMn 2 o 4 , according to the target product Li 4 mn 2 o 4 Calculating the stoichiometric ratio of lithium carbonate, after weighing, stir the manganese source and lithium source slightly, put them into a stainless steel ball mill jar and mix them by ball mill mixing method. The ball mill mixing method adopts a planetary ball mill produced by the affiliated factory of Nanjing University with a rotation speed of 500 rpm, and the ball mill is mixed for 1 hour before taking out. When the mixed powder raw material does not reach 200 mesh, then ball milling and mixing for 1 hour.

[0030] With a pressurized mold with an inner diameter of 20 mm from Tianjin Keqi Company, under a pressure of 10-20 MPa, the powder raw material mixed by the above-mentioned ball mill is pressed into a hard sheet, each weighing 0.5 g. Put the above-mentioned h...

Embodiment 2

[0034] The manganese source used for synthesis is MnO 2 , the lithium source used for synthesis is lithium carbonate. Weigh 10g of MnO 2 , according to the target product Li 4 mn 2 o 4 Calculate the stoichiometric ratio of lithium carbonate, calculate the stoichiometric ratio of cobalt carbonate according to the 10% mol ratio of the manganese content, after weighing, stir the manganese source, lithium source and manganese-substituting additive cobalt carbonate, and put it into a stainless steel ball mill tank Mixed by ball milling method. The powder raw materials mixed by ball milling were pressed into hard tablets, each weighing 0.5 g, and the pressure was 20 MPa. Put the above-mentioned hard sheet into a ceramic boat, place it in a tube furnace, and sinter it in an air atmosphere. The heating rate during sintering is 20°C / min, and when the temperature rises to 850°C, it is kept at a constant temperature of 800°C for 1 hour, and then naturally cooled to room temperature...

Embodiment 3

[0038] The manganese source used in the synthesis is LiMn 2 o 4 and MnO 2 , the lithium source for synthesis is lithium oxalate and lithium carbonate. Weigh 5 g of LiMn 2 o 4 and 5g of MnO 2 , the molar ratio of lithium source lithium oxalate and lithium carbonate is 1:1, according to the target product Li 3 mn 2 o 4 Calculation of the stoichiometric ratio of the Li source, in terms of Li 3 mn 2 o 4 The 10% mol ratio of the lithium amount is used to calculate the sodium carbonate of the stoichiometric ratio. After weighing, the manganese source, the lithium source and the sodium carbonate are stirred slightly, and put into a stainless steel ball mill tank and mixed by a ball mill mixing method. The powder raw materials mixed by ball milling were pressed into hard tablets with a diameter of 20mm, each piece weighed 0.3g, and the pressure was 10MPa. The above-mentioned hard sheet was put into a ceramic boat, placed in a tube furnace, and sintered in a mixed gas of car...

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Abstract

The invention relates to a preparation method of multivalent lithium manganese oxide, and belongs to the field of electrochemical engineering and industry. Multivalent lithium manganese oxide is prepared by a high-temperature hydrothermal or high-temperature sintering method by controlling a manganese source, a lithium source and a mixing mode of the manganese source and the lithium source; a chemical formula of an obtained product is LixMn2Oy; x is greater than or equal to 2 and less than or equal to 4; and y is greater than or equal to 4 and less than or equal to 5. Manganese in multivalent lithium manganese oxide prepared by the method is in a lower valent state, contains multiple available lithium ions, and is high in specific capacity. The preparation method has the characteristics of simple technology, low cost and low pollution. A multivalent lithium manganese oxide material prepared by the method can be used in a battery system with an organic electrolyte or a neutral aqueous solution, is an appropriate active electrode material, is high in specific capacity, low in cost and high in activity, and has a wide application prospect in energy storage of an electric tool, an electromobile, a power grid and the like.

Description

technical field [0001] The invention belongs to the field of electrochemical engineering and industrial devices, and in particular relates to a preparation method of multi-variable lithium manganese oxide in the field of battery production technology, which can be used as an electrode active material for lithium ion battery systems of aqueous solutions and organic electrolytes, and organic electrolysis liquid lithium battery system. Background technique [0002] The development of renewable energy such as wind energy and solar energy is an inevitable choice for human society to deal with the depletion of non-renewable energy such as coal and oil, and it is an important way to fundamentally solve the threat of air and ecological environment pollution. Wind energy, solar energy and other renewable energy power generation is time-varying and unstable, which greatly limits its large-scale grid-connected utilization. Chemical battery storage technology is an effective method to ...

Claims

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Application Information

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IPC IPC(8): H01M4/505
CPCH01M4/505Y02E60/10
Inventor 杨裕生程杰申亚举文越华潘君丽赵平曹高萍
Owner ZHANGJIAGANG SMARTGRID FANGHUA ELECTRICAL ENERGY STORAGE RES INST
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