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Preparation method of lithium vanadium manganese phosphate positive electrode material

A technology of lithium manganese vanadium phosphate and positive electrode materials, which is applied in the field of lithium-ion batteries, can solve the problems of aggravated electrolyte decomposition, battery cost increase, capacity attenuation, etc., and achieve the effect of improving material performance, excellent performance, and stable structure

Active Publication Date: 2021-07-02
天津斯科兰德科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium vanadium phosphate realizes the reversible deintercalation of three lithiums, and needs to be charged to 4.8V, which will intensify the decomposition of the electrolyte and cause serious capacity attenuation.
At the same time, the price of vanadium is relatively high. If it is used as a cathode material for power batteries on a large scale, it will inevitably cause a sharp increase in battery costs.

Method used

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  • Preparation method of lithium vanadium manganese phosphate positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] S1, take by weighing 33.22g of manganese sulfate, 85.8g of alum sulfate, 98g of phosphoric acid, add 500ml of ammonia water as a buffer to make a solution, then use lithium hydroxide to adjust the pH=8 of the solution;

[0028] S2. Filter the solution to obtain the precipitate, wash the precipitate repeatedly for 3-10 times and remove the crystal water at 120°C;

[0029] S3. Weigh 25.3g of glucose and 36.2g of lithium carbonate, make the molar ratio of elements Li:Mn:V:P=1.02:0.22:0.44:1, the mass of carbon source is 10wt% of the theoretical product mass, and mix the precursors by pulverizing and grinding received for use;

[0030] S4. Put the collected dry powder material in a continuous sintering furnace, pre-flow nitrogen for 0.5h before sintering to ensure an oxygen-free environment, sinter at a high temperature of 700°C for 7h, absorb exhaust gas during the sintering process; cool the sintered material Afterwards, it is ground and pulverized to form the final prod...

Embodiment 2

[0032] S1. Weigh 25.7g of manganese sulfate, 97.5g of alum sulfate, and 98g of phosphoric acid, add 250ml of ammonia water as a buffer to make a solution, and then use lithium hydroxide to adjust pH=7;

[0033] S2. Filter the solution to obtain the precipitate, wash the precipitate repeatedly for 3-10 times and remove the crystal water at 100°C;

[0034] S3. Weigh 25.7g of glucose and 36.2g of lithium carbonate, so that the molar ratio of elements Li:Mn:V:P=1.02:0.17:0.5:, the quality of carbon source is 10wt% of the theoretical product quality, and the mixed precursor is crushed and collected stand-by;

[0035] S4. Collect the collected dry powder materials and place them in a continuous sintering furnace. Pre-flow nitrogen for 5 hours before sintering to ensure an oxygen-free environment. Sinter at a high temperature of 650°C for 8 hours and absorb tail gas during the sintering process; put the sintered materials After cooling, grind and pulverize to form the final product ...

Embodiment 3

[0037] S1. Weigh 19.6g of manganese sulfate, 103.5g of vanadium sulfate, and 98g of phosphoric acid, add 1000ml of ammonia water as a buffer to make a solution, and then use lithium hydroxide to adjust pH=6;

[0038] S2. Filter the solution to obtain the precipitate, wash the precipitate repeatedly for 3-10 times and remove the crystal water at 200°C;

[0039] S3. Weigh 36.2g of lithium carbonate and 25.7g of glucose, make the element molar ratio Li:Mn:V:P=1.02:0.13:0.53:1, the mass of the carbon source is 10wt% of the theoretical product mass, and mix the precursors by pulverizing and grinding received for use;

[0040]S4. Put the collected dry powder material in a continuous sintering furnace, pre-flow nitrogen for 10 hours before sintering to ensure an oxygen-free environment, sinter at a high temperature of 700°C for 6 hours, absorb exhaust gas during the sintering process; cool the sintered material Grinding and crushing are carried out to form the final product LMVP-3. ...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a lithium vanadium manganese phosphate positive electrode material. The preparation method comprises the following steps: firstly, preparing a vanadium manganese phosphate precursor, wherein weighing initial raw materials including a manganese source compound, a vanadium source compound and a phosphorus source compound according to a molar ratio, mixing, pouring into a liquid-phase medium, and stirring on an automatic stirrer; adding ammonia water as a buffering agent into the stirred liquid, then adding sodium hydroxide to adjust the pH value, filtering out a precipitate after the precipitate appears in the liquid, repeatedly washing and drying, crushing, and dehydrating at high temperature to obtain a precursor; mixing the precursor subjected to high-temperature dehydration with a lithium source and a carbon source, and grinding and crushing; and sintering the dry powder material in an oxygen-free environment, and grinding to form a final product. The prepared lithium vanadium manganese phosphate is small in particle size, uniform in particle size distribution, easy to coat and dope and modify, excellent in performance, high in quality and stable in structure, and the material performance is better improved.lithium vanadium manganese phosphate positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for preparing a lithium manganese vanadium phosphate cathode material. Background technique [0002] With the continuous development of human society, environmental problems have become increasingly prominent. In recent years, domestic smog has continued to increase, which has led to people's urgent demands for environmental improvement. With the rise of the national new energy strategy, lithium-ion batteries, as a clean energy source, have attracted much attention due to their small size, high energy density, safety and environmental protection. As its main component, cathode materials have also made great progress. Human society is now facing two major new energy issues: one is the research of primary energy materials and the development of new energy sources, and the other is the storage and use of secondary energy, especially portable and ...

Claims

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Application Information

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IPC IPC(8): C01B25/45C04B35/447C04B35/622H01M4/58H01M10/0525
CPCC01B25/45C04B35/447C04B35/622H01M4/5825H01M10/0525H01M2004/021H01M2004/028C01P2006/40C04B2235/3203C04B2235/3239C04B2235/3262C04B2235/6567Y02E60/10
Inventor 李积刚
Owner 天津斯科兰德科技有限公司
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