Lithium manganese phosphate nano-ellipsoids and preparation method thereof

A lithium manganese phosphate, nanotechnology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of low cost, slow lithium ion diffusion, poor conductivity, etc., achieve low cost, improve high current charging and discharging Stable performance and quality

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, low cost, and its energy density is 34% higher than that of lithium iron phosphate. Its high energy density and high safety The 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 microscopic morphology of lithium manganese phosphate cathode materials
The microscopic morphology of lithium manganese phosphate prepared by wet chemical methods such as hydrothermal, solvothermal, and sol-gel methods is mostly single crystal diamond-shaped block or flake particles, and there has been no report on ellipsoidal lithium manganese phosphate

Method used

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  • Lithium manganese phosphate nano-ellipsoids and preparation method thereof
  • Lithium manganese phosphate nano-ellipsoids and preparation method thereof
  • Lithium manganese phosphate nano-ellipsoids and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0023] 1) Weigh 1.470g of manganese acetate, dissolve it in 15 ml of ethylene glycol, stir for 10 minutes, then weigh 0.2000 g of ascorbic acid and dissolve it in the above solution, and stir until fully dissolved to obtain a concentration of manganese acetate of 0.4 mol / L and a concentration of ascorbic acid Solution A of 0.076 mol / L;

[0024] 2) Dissolve 0.588g of phosphoric acid and 0.612g of lithium acetate in 15ml of ethylene glycol and stir for 30 minutes to form a suspension B with a phosphoric acid concentration of 0.4 mol / L and a lithium acetate concentration of 0.4 mol / L;

[0025] 3) Add the suspension B prepared in step 2) dropwise to solution A in step 1) under stirring to form emulsion C, so that the molar ratio of Li, Mn, and P in emulsion C is 1 :1:1;

[0026] 4) Transfer the emulsion C in step 3) to an autoclave with a liner volume of 50ml, add 5 ml of ethylene glycol solution containing 0.112 g KOH, stir well, and then adjust its volume to 40ml with ethylene ...

example 2

[0030] 1) Weigh 2.45g of manganese acetate, dissolve it in 15 ml of ethylene glycol, stir for 60 minutes, then weigh 0.400 g of ascorbic acid and dissolve it in the above solution, and stir until fully dissolved to obtain manganese acetate concentration of 0.67 mol / L, ascorbic acid Solution A with a concentration of 0.152 mol / L;

[0031] 2) Dissolve 0.98 g of phosphoric acid and 2.04 g of lithium acetate in 15 ml of ethylene glycol and stir for 60 minutes to form a suspension B with a concentration of phosphoric acid of 0.67 mol / L and a concentration of lithium acetate of 1.33 mol / L;

[0032] 3) Add the suspension B prepared in step 2) dropwise to solution A in step 1) under stirring to form emulsion C, so that the molar ratio of Li, Mn, and P in emulsion C is 3 :1:1;

[0033] 4) Transfer the emulsion C in step 3) to an autoclave with a liner volume of 60ml, add 6 ml of ethylene glycol solution containing 0.224 g KOH, stir well, and then adjust its volume to 40ml with ethylen...

example 3

[0036] 1) Weigh 2.94g of manganese acetate, dissolve it in 15 ml of ethylene glycol, stir for 120 minutes, then weigh 0.240 g of ascorbic acid and dissolve it in the above solution, stir until fully dissolved, and obtain manganese acetate concentration of 0.80 mol / L, ascorbic acid Solution A with a concentration of 0.091 mol / L;

[0037] 2) Dissolve 1.176 g of phosphoric acid and 1.224 g of lithium acetate in 15 ml of ethylene glycol and stir for 120 minutes to form a suspension B with a phosphoric acid concentration of 0.80 mol / L and a lithium acetate concentration of 0.80 mol / L;

[0038] 3) Add the suspension B prepared in step 2) dropwise to solution A in step 1) under stirring to form emulsion C, so that the molar ratio of Li, Mn, and P in emulsion C is 1 :1:1;

[0039] 4) Transfer the emulsion C in step 3) to an autoclave with a liner volume of 55ml, add 5 ml of ethylene glycol solution containing 0.112 g KOH, stir well, and then adjust its volume to 40ml with ethylene gl...

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Abstract

The invention discloses lithium manganese phosphate nano-ellipsoids. The nano-ellipsoids are mono-like prepared from lithium manganese phosphate monocrystal particles with the diameter of 3-6nm, and have the major diameter of 0.8-2.8 microns and the minor diameter of 0.5-1.8 microns. A preparation method of the nano-ellipsoids comprises the steps that a solvent, required for solvent thermal reaction, is prepared from ethylene glycol, manganese acetate, lithium acetate and phosphoric acid are taken as reacting materials, potassium hydroxide is taken as a mineralizer, so as to promote nucleation and growth, heat treatment is carried out at high temperature and high pressure, and then, the lithium manganese phosphate nano-ellipsoids are obtained. The lithium manganese phosphate nano-ellipsoids and the preparation method thereof have the advantages that the lithium manganese phosphate nano-ellipsoids are stable in quality, high in purity and good in particle dispersibility and are 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 nano material and a preparation method thereof, in particular to a lithium manganese phosphate nano ellipsoid 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 4 . How...

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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