Preparation method of nano-grade lithium manganese phosphate anode material

A technology of lithium manganese phosphate and positive electrode materials, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of poor electrochemical properties of materials, long synthesis time, and low product purity, and achieve uniform particles, low cost, and increase production and the effect of purity

Active Publication Date: 2013-03-06
FOSHAN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of long synthesis time, complicated process, high cost, low product purity, difficulty in nanometerization and poor electrochemical performance of the material existing in the existing method for synthesizing lithium manganese phosphate cathode material

Method used

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  • Preparation method of nano-grade lithium manganese phosphate anode material
  • Preparation method of nano-grade lithium manganese phosphate anode material
  • Preparation method of nano-grade lithium manganese phosphate anode material

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Mixing reaction in liquid phase: dissolve lithium acetate (0.96mol), manganese acetate (1mol), diammonium hydrogen phosphate (1mol), and aluminum nitrate (0.04mol) in water respectively, and mix them, and adjust the pH of the solution with nitric acid 3, form solution A, the concentration of solution A is 60% by weight; dissolve malic acid (2mol) in water, mix with solution A to form solution B, the concentration of solution B is 75% by weight; Add 50g of glucose and stir to form a uniform colloid;

[0038] (2) Preparation of precursor powder: place the colloid in a vacuum oven for vacuum drying, heat to 100°C, and dry for 8 hours to obtain lithium manganese phosphate precursor powder;

[0039] (3) Nanoization: the precursor powder is heated up to 300°C at a heating rate of 5°C / min under a nitrogen atmosphere, kept at a constant temperature for 3 hours, and then cooled naturally to obtain a nanonized powder;

[0040] (4) Structure sintering: the obtained nano-sized...

Embodiment 2

[0043] (1) Liquid phase mixing reaction: dissolve lithium carbonate (1mol), manganese nitrate (0.95mol), ammonium dihydrogen phosphate (1mol), and iron nitrate (0.05mol) in water-ethanol (1:1), And mix, adjust solution pH with nitric acid to be 4, form solution A, the concentration of solution A is 40% by weight; Dissolve citric acid (1mol) in water, mix with solution A, form solution B, the concentration of solution B is weight percent Percentage 60%; Add 6g carbon nanotubes in solution B, stir into uniform colloid;

[0044] (2) Preparation of precursor powder: place the colloid in a vacuum oven for vacuum drying, heat to 150°C, and dry for 6 hours to obtain lithium manganese phosphate precursor powder;

[0045] (3) Nanoization: the precursor powder is heated up to 400°C at a heating rate of 8°C / min under a nitrogen atmosphere, kept at a constant temperature for 2 hours, and then cooled naturally to obtain a nanonized powder;

[0046] (4) Structure sintering: the obtained na...

Embodiment 3

[0049] (1) Liquid phase mixing reaction: Dissolve lithium nitrate (1mol), manganese citrate (1mol), and ammonium phosphate (1mol) in water respectively, and mix them, adjust the pH of the solution to 2 with nitric acid to form solution A, solution A The concentration of glycine (3mol) is 30% by weight; dissolve glycine (3mol) in acetone and mix it with solution A to form solution B, the concentration of solution B is 50% by weight; add 10g conductive carbon to solution B and stir to form a uniform colloid;

[0050] (2) Preparation of precursor powder: place the colloid in a vacuum oven for vacuum drying, heat to 120°C, and dry for 10 hours to obtain lithium manganese phosphate precursor powder;

[0051] (3) Nanoization: the precursor powder is heated up to 350°C at a heating rate of 3°C / min under a nitrogen atmosphere, kept at a constant temperature for 3 hours, and then cooled naturally to obtain a nanonized powder;

[0052](4) Structure sintering: the obtained nano-sized po...

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Abstract

The invention discloses a preparation method of a nano-grade lithium manganese phosphate anode material, comprising the following steps of: preparing a lithium source, a manganese source, a phosphorus source and a doping element compound into a solution in a mol ratio of Li: Mn: P: the doping element of (0.9-1): (0.9-1): (0.9-1): (0-0.1); adding a complexing agent and adding a carbon source into the solution to obtain a uniform colloid; drying the colloid to obtain precursor powder; heating the precursor powder under a protective atmosphere to obtain nano powder; and sintering the nano powder under a protective atmosphere to obtain the nano-grade lithium manganese phosphate anode material. The method belongs to one of a liquid-phase method; each element is at an ion or molecule state in a synthesizing process and the mixing is more uniform; on the basis of the existing liquid-phase method, the synthesizing time is further shortened, a production process is simplified and the cost is reduced; and the nano grade and the purity of a synthesized product are high, the grain diameter is 10-400 nm and the electrochemical performance is good.

Description

technical field [0001] The invention belongs to the technical field of energy materials, in particular to the technical field of positive electrode materials for lithium ion batteries, and specifically relates to a preparation method of a nanoscale lithium manganese phosphate positive electrode material. Background technique [0002] Lithium-ion battery cathode materials lithium manganese phosphate and lithium iron phosphate have the same theoretical capacity of 170mAh / g, but its electrode potential relative to Li+ is 4.1V, which is much higher than the 3.4V voltage platform of lithium iron phosphate. The high potential of 4.1V makes lithium manganese phosphate have the advantage of potentially high energy density. If the actual capacity of lithium manganese phosphate is the same as that of lithium iron phosphate, its energy density will be 35% higher than that of lithium iron phosphate. Therefore, lithium manganese phosphate is used as A new generation of cathode materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 孔令涌尚伟丽黄永侃
Owner FOSHAN DYNANONIC
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