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A kind of preparation method of nanometer lithium manganese phosphate/graphene/carbon composite material

A carbon composite material, lithium manganese phosphate technology, used in active material electrodes, electrical components, electrochemical generators, etc., can solve problems such as high temperature and pressure, and achieve enhanced electronic conductivity, mild reaction conditions, and improved electrochemical performance. performance effect

Inactive Publication Date: 2017-10-24
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method adopted in this method is a hydrothermal reaction of high temperature and high pressure, which requires high temperature and pressure.

Method used

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  • A kind of preparation method of nanometer lithium manganese phosphate/graphene/carbon composite material
  • A kind of preparation method of nanometer lithium manganese phosphate/graphene/carbon composite material
  • A kind of preparation method of nanometer lithium manganese phosphate/graphene/carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 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 0.02 mol 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 centri...

Embodiment 2

[0031] 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 centrifug...

Embodiment 3

[0033] 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 preparation method for a lithium manganese phosphate / graphene / carbon nanocomposite. 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; dispersing graphene oxide into the surfactant; 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 lithium manganese phosphate / graphene composite material; then performing recombination between the lithium manganese phosphate / graphene composite material and an organic carbon source to obtain the lithium manganese phosphate / graphene / carbon nanocomposite. The synthesized target product obtained in the invention can shorten the transfer distance of lithium ions among solid phases; and in addition, the electronic conductivity among particles is greatly improved due to a conductive network formed by amorphous carbon generated in splitting decomposition of graphene and the organic carbon source.

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 nanometer lithium manganese phosphate / graphene / carbon 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 lith...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M4/1397H01M10/0525
CPCH01M4/136H01M4/1397H01M4/362H01M4/5825H01M4/625H01M4/628H01M10/0525H01M2004/028Y02E60/10
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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