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Method for preparing nano lithium manganese phosphate/graphene composite

A technology of lithium manganese phosphate and composite material, which is applied in the field of preparation of nanometer lithium manganese phosphate/graphene composite material, can solve the problems of high cost and complicated operation, and achieve the effects of low cost, simple operation and simple process operation.

Inactive Publication Date: 2016-04-20
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The micronano LiMnPO mentioned above 4 Most of the synthesis of particles is by high-temperature and high-pressure solvent method. The reaction needs to be carried out in a high-pressure and high-temperature container, and the operation is complicated and the cost is high.

Method used

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  • Method for preparing nano lithium manganese phosphate/graphene composite
  • Method for preparing nano lithium manganese phosphate/graphene composite
  • Method for preparing nano lithium manganese phosphate/graphene composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 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. 31.4 mg of graphene oxide was ultrasonically dispersed into solution A to obtain solution A containing graphene oxide. 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 0.02mol 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 centrif...

Embodiment 2

[0026]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. 15.7 mg of graphene oxide was ultrasonically dispersed in solution A to obtain solution A containing graphene oxide. Take 0.06mol lithium hydroxide (LiOH·H 2 O) Dissolve in 30mL deionized water, mix it with solution A and stir 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 centrifuge...

Embodiment 3

[0028] 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. 31.4 mg of graphene oxide was ultrasonically dispersed in solution A to obtain solution A containing graphene oxide. Take 0.03mol lithium hydroxide (LiOH·H 2 O) Dissolve in 10mL deionized water, mix it with solution A and stir 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 ce...

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Abstract

The invention discloses a method for preparing a nano lithium manganese phosphate / graphene composite. The method comprises the specific steps that ethylene glycol and deionized water are adopted as a reaction medium, glucose is firstly added to ethylene glycol, the temperature is kept at 130 DEG C to 150 DEG C for 1 h to 5 h, an ethylene glycol glucoside surface active agent is online generated and serves as a crystalline grain generation inhibitor, graphene oxide is dispersed into the surface active agent, lithium hydroxide, soluble manganese salt and phosphoric acid are adopted as raw materials, deionized water is adopted as a solvent, the volume ratio of ethylene glycol to the water is regulated and controlled to range from 3.5:1 to 1:1.5, the boiling point of the reaction solution is controlled to be from 130 DEG C to 150 DEG C, a reflux reaction is carried out for 6 h to 24 h, and the nano lithium manganese phosphate / graphene composite is prepared. The synthesized nano lithium manganese phosphate / graphene composite is beneficial to reducing the transfer distance of lithium ions in a solid phase, compounded graphene has better conductivity, and therefore the diffusion rate of the lithium ions in particles is greatly increased, and the electronic conductivity among the particles is greatly enhanced.

Description

technical field [0001] The invention belongs to the technical field of synthesis of positive electrode materials of lithium ion batteries, and in particular relates to a preparation method of nano manganese lithium phosphate / graphene composite material. Background technique [0002] 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 theoretical specific energy can reach nearly 700Wh / kg, which is higher than that of LiFePO 4 about 20% higher. In addition LiMnPO 4 It has the advantages of rich raw material resources, low price, environmental friendliness, stable structure, good chemical compatibility and high safety, and is considered to be a positive electrode material for power lithium-ion batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/364H01M4/5825H01M10/0525Y02E60/10
Inventor 常焜汤宏伟谢峥峥李苞上官恩波常照荣
Owner HENAN NORMAL UNIV
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