Lithium manganese phosphate nanoparticles and preparation method thereof

A nanoparticle, lithium manganese phosphate technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of low cost, poor conductivity, slow lithium ion diffusion, etc., to achieve low cost, stable quality, and improved The effect of high current charge and discharge performance

Inactive Publication Date: 2014-12-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study found that the lithium manganese phosphate material has a moderate working voltage (4.1V), a theoretical capacity of 171mAh / g, good cycle performance, and low cost, and its energy density is 34% higher than that of lithium iron phosphate. Its high energy density and high The safety performance makes it have outstanding application prospects in power lithium-ion batteries, but its disadvantages are its poor conductivity and slow diffusion of lithium ions, which are greatly related to the particle size of lithium manganese phosphate cathode materials

Method used

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  • Lithium manganese phosphate nanoparticles and preparation method thereof
  • Lithium manganese phosphate nanoparticles and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] 1) Dissolve 2.000 g of P123 in 20 ml of ethylene glycol, stir for 240 minutes, then add 1.225 g of manganese acetate tetrahydrate and 0.200 g of ascorbic acid, and stir until fully dissolved to obtain a manganese acetate concentration of 0.25 mol / L, ascorbic acid Solution A with a concentration of 0.057 mol / L and a P123 concentration of 0.1 g / mL;

[0020] 2) Dissolve 0.490g of phosphoric acid and 0.510g of lithium acetate dihydrate in 20 ml of ethylene glycol and stir for 30 minutes to form a suspension B with a phosphoric acid concentration of 0.25 mol / L and a lithium acetate concentration of 0.25 mol / L;

[0021] 3) Add the suspension B prepared in step 2) dropwise to the solution A prepared in step 1) under stirring to form emulsion C. The molar ratio of Li, Mn, and P in emulsion C is 1:1:1.

[0022] 4) Transfer the emulsion C in step 3) to a 60ml autoclave, adjust its volume to 40ml with ethylene glycol, make the P concentration 0.125 mol / L, and continue stirring fo...

example 2

[0026] 1) Dissolve 3.000 g of P123 in 20 ml of ethylene glycol, stir for 300 minutes, then add 2.45 g of manganese acetate tetrahydrate and 0.400 g of ascorbic acid, and stir until fully dissolved to obtain a manganese acetate concentration of 0.5 mol / L, ascorbic acid Solution A with a concentration of 0.114 mol / L and a P123 concentration of 0.15 g / mL;

[0027] 2) Dissolve 0.98g of phosphoric acid and 2.04g of lithium acetate dihydrate in 20 ml of ethylene glycol and stir for 90 minutes to form a suspension B with a concentration of phosphoric acid of 0.5 mol / L and a concentration of lithium acetate of 1.0 mol / L ;

[0028] 3) Add the suspension B prepared in step 2) dropwise to the solution A prepared in step 1) under stirring to form emulsion C. The molar ratio of Li, Mn, and P in emulsion C is 2:1:1.

[0029] 4) Transfer the emulsion C in step 3) to a 50ml autoclave, adjust its volume to 40ml with ethylene glycol, make the P concentration 0.25 mol / L, and continue stirring ...

example 3

[0032] 1) Dissolve 4.000 g of P123 in 20 ml of ethylene glycol, stir for 360 minutes, then add 3.675 g of manganese acetate tetrahydrate and 0.320 g of ascorbic acid, and stir until fully dissolved to obtain a manganese acetate concentration of 0.75 mol / L, ascorbic acid Solution A with a concentration of 0.909 mol / L and a P123 concentration of 0.20 g / mL;

[0033] 2) Dissolve 1.47g of phosphoric acid and 4.59g of lithium acetate dihydrate in 20 ml of ethylene glycol and stir for 150 minutes to form a suspension B with a concentration of phosphoric acid of 0.75 mol / L and a concentration of lithium acetate of 2.25 mol / L ;

[0034] 3) Add the suspension B prepared in step 2) dropwise to the solution A prepared in step 1) under stirring to form emulsion C. The molar ratio of Li, Mn, and P in emulsion C is 3:1:1.

[0035] 4) Transfer the emulsion C in step 3) to an autoclave with a volume of 55ml, adjust its volume to 40ml with ethylene glycol, make the P concentration 0.375 mol / L...

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Abstract

The invention discloses lithium manganese phosphate nanoparticles. The nanoparticles have the size of 50-100nm. A preparation method of the nanoparticles comprises the steps that a solvent, required for solvent thermal reaction, is prepared from ethylene glycol, manganese acetate tetrahydrate, lithium acetate dihydrate and phosphoric acid are taken as reacting materials, P123 is taken as a surfactant, so as to influence nucleation and growth, heat treatment is carried out at high temperature and high pressure, then, segmented calcining is carried out at the temperature of 300-400 DEG C and 550-650 DEG C under the protection of a nitrogen or argon atmosphere, and then, the lithium manganese phosphate nanoparticles are obtained. The lithium manganese phosphate nanoparticles and the preparation method thereof have the advantages that the product is stable in quality, high in purity and good in particle dispersibility and is beneficial to the diffusion of lithium ions and the improvement of the electrochemical properties of a lithium-ion battery, and the preparation process is simple in process, easy to control and low in cost and is pollution-free, so that the large-scale production is facilitated.

Description

technical field [0001] The invention relates to a lithium manganese phosphate nanometer material and a preparation method thereof, in particular to a lithium manganese phosphate nanometer particle and a preparation method thereof. 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 towards safety, environmental protection, Development in the direction of low cost and high specific energy. Among them, the development of new electrode materials, especially positive electrode materials, is extremely critical. At present, the widely studied cathode materials for lithium-ion batteries focus on transition metal oxides of lithium such as LiMO with a layered structure. 2 (M=Co, Ni, Mn) and LiMn with spinel structure 2 o ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/45B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B25/45H01M4/5825Y02E60/10
Inventor 徐刚李玲玲李峰任召辉刘涌李翔沈鸽韩高荣
Owner ZHEJIANG UNIV
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