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Preparation method of lithium ion battery positive material of ferric metasilicate lithium

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problem of lithium ion diffusion that cannot be fundamentally solved, lithium iron phosphate has poor high-rate discharge performance, and increases the difficulty of lithium ion diffusion. and other problems, to achieve the effect of excellent discharge performance at high rate, uniform particle size and small particle size

Inactive Publication Date: 2010-08-18
湖南格林新能源有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the conductivity of carbon produced by the decomposition of precursor organic matter is inferior to that of conductive agents produced by professional conductive agent manufacturers, and cannot solve the problem of poor high-rate discharge performance of lithium iron phosphate
[0007] In addition, among these methods for improving the poor high-rate discharge performance of lithium iron phosphate, although some methods do increase the conductivity of the material, they cannot fundamentally solve the problem of lithium ion diffusion in the material, and even increase the conductivity of the material to a certain extent. The difficulty of diffusion of lithium ions in the material

Method used

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  • Preparation method of lithium ion battery positive material of ferric metasilicate lithium
  • Preparation method of lithium ion battery positive material of ferric metasilicate lithium

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Embodiment 1

[0048] Dissolve 0.50 mol of lithium acetate in 50 ml of water, 0.65 mol of ferrous chloride in 70 ml of water and 0.60 mol of phosphoric acid in 80 ml of water, and fully mix the three aqueous solutions to obtain 200 ml of mixed aqueous solution, turn on ultrasonic stirring, and add 0.2 g Sodium dodecylbenzenesulfonate and 0.2g TX-10, then slowly add dropwise 1mol / L sodium hydroxide aqueous solution to adjust the pH of the solution to 8, react in a sealed container with nitrogen protection for 20 hours, filter, and use The obtained filter cake was washed with ionic water until the filtrate was neutral, and the obtained filter cake was centrifuged and dried with a centrifuge, wherein the speed of the centrifuge was 1000r / min, and the centrifugation time was 100min to obtain 10g of the precursor. The precursor is added into the aqueous glucose solution, the concentration of the aqueous glucose solution used is 5% (based on the weight of the aqueous glucose solution), and the weig...

Embodiment 2

[0050] Dissolve 0.50 mol of lithium chloride in 50 ml of water, 0.50 mol of ferrous acetate in 70 ml of water and 0.50 mol of diammonium hydrogen phosphate in 80 ml of water, and fully mix the three aqueous solutions to obtain 200 ml of mixed aqueous solution, turn on ultrasonic stirring, Add 0.3g hexadecyltrimethylammonium bromide and 0.3g TX-10, then slowly add dropwise 1mol / L potassium hydroxide aqueous solution to adjust the pH to 8, and react for 5 hours in a sealed container protected by argon gas , filtered, washed the obtained filter cake with deionized water, and centrifuged and dried the obtained filter cake with a centrifuge, wherein the rotating speed of the centrifuge was 1500r / min, and the centrifugation time was 10min to obtain 9g of the precursor. The precursor is added in the sucrose aqueous solution, the concentration of the sucrose aqueous solution used is 10% (based on the weight of the sucrose aqueous solution), wherein the weight of the sucrose is 4.5g, an...

Embodiment 3

[0052] Dissolve 0.50 mol of lithium nitrate in 50 ml of water, 0.55 mol of ferrous sulfate in 70 ml of water and 0.55 mol of potassium dihydrogen phosphate in 80 ml of water, and fully mix the three aqueous solutions to obtain 200 ml of mixed aqueous solution, turn on ultrasonic stirring, add 0.6g hexadecyltrimethylammonium bromide and 0.6g TX-10, then slowly drop 1mol / L ammonia water to adjust the pH to 9, react in a sealed container protected by nitrogen-argon mixed gas for 30 hours, filter, The obtained filter cake was washed with deionized water, and the obtained filter cake was centrifuged and dried with a centrifuge, wherein the rotation speed of the centrifuge was 3500 r / min, and the centrifugation time was 120 min to obtain 10 g of the precursor. Precursor is added in the aqueous solution of citric acid, the concentration of used aqueous citric acid is 3% (based on the weight of aqueous citric acid), wherein, the weight of citric acid is 1.5g, in the microwave oven prot...

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Abstract

The invention relates to a preparation method of a lithium ion battery positive material of ferric metasilicate lithium, which comprises the following steps: preparing precursors in a water solution of a compound surface active agent; Preparing the lithium ion battery positive material of the ferric metasilicate lithium in a mode of ultrasonic wave stirring and microwave oven calcination. The precursors prepared by the method of the invention have smaller granularity and more uniform grain diameter, in addition, the reaction raw materials are in sufficient contact because of the ultrasonic wave stirring, and the reaction process can be carried out more easily and faster. The preparation method of the lithium ion battery positive material of the ferric metasilicate lithium of the invention solves the problem of diffusion of lithium ions in the materials in the prior art, and is favorable for improving the high-rate electric discharge capability of the ferric metasilicate lithium positive material.

Description

technical field [0001] The present invention relates to a preparation method of lithium iron phosphate, a positive electrode material of lithium ion battery, in particular to a method for preparing a precursor by using a surfactant, ultrasonic stirring, and sintering in a microwave oven to prepare lithium iron phosphate, a positive electrode material of lithium ion battery . Background technique [0002] Because of its high specific energy, high specific power and good high-temperature performance, lithium-ion batteries have been widely welcomed by people. They are widely used in power supplies for mobile phones, computers, cameras, etc., and have been used in aviation, aerospace, artificial satellites and military applications. In the field of equipment communication, the traditional power supply is gradually replaced, and the large-capacity, high-power power lithium-ion battery will also become an ideal power supply for environmentally friendly electric vehicles. Lithium ...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/58
CPCY02E60/122Y02E60/10
Inventor 孙立彬胡健阚国锋王升威陈华宏陈峰
Owner 湖南格林新能源有限公司
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