A full-dimensional nanocarbon-coated limnpo 4 Granule preparation method

A nano-particle technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of increasing the diffusion path of lithium ions, inhibiting the migration rate of lithium ions, and affecting the diffusion speed of lithium ions, so as to achieve excellent electrochemical performance and shorten the The effect of transmission distance and low price

Inactive Publication Date: 2017-10-24
HENAN NORMAL UNIV
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Problems solved by technology

But this carbon coating only improves the conductivity between particles, and the micron-sized LiMnPO 4 Particles will increase the migration distance of lithium ions inside, which greatly inhibits the migration rate of lithium ions in the solid phase
In addition, the amorphous carbon produced by the cracking of organic carbon source compounds such as glucose can only be coated on the surface of the aggregate, while the internal The diffusion path of lithium ions in the solid phase increases, which directly affects the diffusion speed of lithium ions

Method used

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  • A full-dimensional nanocarbon-coated limnpo <sub>4</sub> Granule preparation method
  • A full-dimensional nanocarbon-coated limnpo <sub>4</sub> Granule preparation method
  • A full-dimensional nanocarbon-coated limnpo <sub>4</sub> Granule preparation method

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Effect test

Embodiment 1

[0027] Dissolve 6g of glucose in 60mL of ethylene glycol and 2 Insulate at 140°C for 2 hours under protection, so that the color of the ethylene glycol solution changes from colorless to light yellow, which indicates that ethylene glycol glucoside surfactants are generated in the ethylene glycol solution, and a light yellow solution A is finally obtained. Take 0.06mol lithium hydroxide (LiOH·H 2 O) Dissolve in 15mL deionized water, mix it with solution A and stir evenly to obtain solution B. Take 0.02mol manganese sulfate (MnSO 4 ) and 0.02 phosphoric acid (H 3 PO 4 ) was dissolved in 15mL deionized water to obtain solution C, and solution C was added to solution B to form a reaction solution. 2 Under protection, the reaction solution was heated to reflux for 12 hours, and the reflux reaction temperature was 139°C. The reaction precipitate was centrifuged at 8000 r / min, washed with deionized water and vacuum dried at 80°C for 12 hours to obtain full-dimensional nano-LiMnP...

Embodiment 2

[0030] Dissolve 8g of glucose in 40mL of ethylene glycol and 2 Under protection, keep warm at 130°C for 5 hours, so that the color of the ethylene glycol solution changes from colorless to light yellow, which indicates that ethylene glycol glucoside surfactants are formed in the ethylene glycol solution, and finally a light yellow solution A is obtained. Take 0.06mol (lithium hydroxide) LiOH·H 2 O was dissolved in 30 mL of deionized water, mixed with solution A and stirred evenly to obtain solution B. Take 0.02mol manganese chloride (MnCl 2 ) and 0.02mol phosphoric acid (H 3 PO 4 ) was dissolved in 30mL deionized water to obtain solution C, and solution C was added to solution B to form a reaction solution. 2 Under protection, the reaction solution was heated to reflux for 24 hours, and the reflux reaction temperature was 130°C. The reaction precipitate was centrifuged at 8000r / min, washed with deionized water and vacuum dried at 80°C for 12h to obtain full-dimensional na...

Embodiment 3

[0032] Dissolve 0.7g of glucose in 70mL of ethylene glycol and 2 Under protection, keep warm at 150°C for 1 hour, so that the color of the ethylene glycol solution changes from colorless to light yellow, which indicates that ethylene glycol glucoside surfactants are generated in the ethylene glycol solution, and a light yellow solution A is finally obtained. Take 0.03mol (lithium hydroxide) LiOH·H 2 O was dissolved in 10 mL of deionized water, mixed with solution A and stirred evenly to obtain solution B. Get 0.01mol manganese nitrate (Mn(NO 3 ) 2 ) and 0.01mol phosphoric acid (H 3 PO 4 ) was dissolved in 10mL deionized water to obtain solution C, and solution C was added to solution B to form a reaction solution. 2 Under protection, the reaction solution was heated to reflux for 6 hours, and the reflux reaction temperature was 150°C. The reaction precipitate was centrifuged at 8000r / min, washed with deionized water and vacuum dried at 80°C for 12h to obtain full-dimensi...

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Abstract

The invention discloses a preparation method for a full-dimensional carbon-coated LiMnPO4 nanoparticle. The preparation method comprises the specific steps of taking ethylene glycol and deionized water as a reaction medium; adding glucose into the ethylene glycol and performing thermal insulation at a temperature of 130-150 DEG C for 1-5h to online generate an ethylene glycol glucoside surfactant, taking the surfactant as a crystal particle generation inhibitor; taking lithium hydroxide, soluble manganese salt and phosphoric acid as the raw materials, and taking deionized water as solvent; regulating and controlling to enable the volume ratio of the ethylene glycol to water to be 3.5:1-1:1.5 to control the boiling point of reaction liquid to be 130-150 DEG C, and performing a backflow reaction for 6-24h to obtain a full-dimensional LiMnPO4 nanoparticle; then performing short-time high-temperature treatment, and coating the scattered LiMnPO4 nanoparticle with a layer of amorphous carbon to obtain the target product. The full-dimensional carbon-coated LiMnPO4 nanoparticle prepared by the invention is used as the positive electrode material of the lithium ion battery; and the migration distance of lithium ions in solid phases can be shortened, and the electronic conductivity among particles is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of synthesis of lithium-ion battery cathode materials, in particular to a full-dimensional nano-carbon-coated LiMnPO 4 Method of preparation of particles. Background technique [0002] Lithium-ion battery, as a high-performance rechargeable green power source, has been widely used in various portable electronic products and communication tools in recent years, and has been gradually developed as a power source for electric vehicles, thereby promoting its development to safety, environmental protection, Development in the direction of low cost and high specific energy. [0003] LiMnPO 4 with and LiFePO 4 The same olivine structure, the same theoretical specific capacity, but its working voltage is 4.1V (relative to Li / Li + Electrode potential), which is just in the electrochemical window of the existing lithium-ion battery electrolyte system. Therefore, due to the higher operating voltage, LiMnPO 4 The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/583H01M4/587H01M4/139
CPCH01M4/139H01M4/362H01M4/5825H01M4/583H01M4/587Y02E60/10
Inventor 常焜谢峥峥汤宏伟李苞上官恩波常照荣
Owner HENAN NORMAL UNIV
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