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Preparation method for lithium-iron phosphate cathode material, and lithium ion battery

A technology for lithium iron phosphate and cathode materials, applied in the direction of positive electrodes, secondary batteries, battery electrodes, etc., can solve the problems of low compaction density, high cost, complex and cumbersome preparation process, etc., and achieve high compaction density and low cost , The effect of streamlining the production process

Active Publication Date: 2019-11-12
FOSHAN DYNANONIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the compaction density of lithium iron phosphate on the market is generally low, generally 2.2-2.3g / cm 3 between; and there are multiple sinterings in the preparation process of the traditional solid-phase method or liquid method of lithium iron phosphate, resulting in high cost, and the whole preparation process is complicated and cumbersome

Method used

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  • Preparation method for lithium-iron phosphate cathode material, and lithium ion battery
  • Preparation method for lithium-iron phosphate cathode material, and lithium ion battery
  • Preparation method for lithium-iron phosphate cathode material, and lithium ion battery

Examples

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preparation example Construction

[0055] Such as figure 1 As stated, in one embodiment of the present invention, a method for preparing a lithium iron phosphate cathode material is provided, comprising the following steps:

[0056] S01. Add the first lithium source, phosphorus source, iron source and first carbon source to the first solvent containing complexing agent to obtain a mixed solution, stir evenly at a temperature of 400-450°C, dry and crush After processing, the precursor ① is obtained;

[0057] S02. After uniformly mixing the iron phosphate particles and the second lithium source in a molar ratio of 1:(1.03-1.1), then add the second carbon source, the second solvent and the doping metal salt, and after fully mixing, grind for 3- 8 hours, after drying and crushing, the precursor ② was obtained, wherein the mass percentage of the second carbon source was 2.9%-8.7%;

[0058] S03. Put the precursor ① and the precursor ② in a mass ratio of 1:(0.5-3), place them in a mixer and mix them evenly to obtain...

Embodiment 1

[0062] A preparation method of lithium iron phosphate cathode material, comprising the following steps:

[0063] (1) Add lithium carbonate, ammonium dihydrogen phosphate, and ferrous oxalate into the reaction kettle at a molar ratio of 0.5:1:1, then add an appropriate amount of glucose and an appropriate amount of methanol, adjust the pH to 7.0, heat at a temperature of 420°C and Stir for 125 minutes until uniform, react to form a complex, dry at 120°C with a dryer, and then crush with a crusher until the particle size of the powder is within the range of 0.1<D90<0.6μm to obtain the precursor ①;

[0064] (2) Select ferric phosphate particles and lithium carbonate to mix and stir evenly at a molar ratio of 1:1.036, then add 6.9% glucose, 4.3% methanol and 0.26% MgSO 4 , after fully mixing, grinding for 7.5 hours, drying at 120°C with a dryer, and crushing with a crusher until the particle size is within the range of 1.1μm<D90<2.5μm to obtain the precursor②;

[0065] (3) Mix th...

Embodiment 2

[0069] A preparation method of lithium iron phosphate cathode material, comprising the following steps:

[0070] (1) Add lithium hydroxide, phosphoric acid and ferrous sulfate in a molar ratio of 3:1:1 to the reaction kettle, then add an appropriate amount of carbon nanotubes and ethanol, adjust the pH to 7.0, and heat at a temperature of 420°C , while stirring for 125 minutes until uniform, reacting to form a complex, drying at 120°C with a dryer, and then crushing with a crusher until the particle size of the powder is within the range of 0.4<D90<0.6μm to obtain the precursor ①;

[0071] (2) Select ferric phosphate particles and lithium hydroxide to mix and stir evenly in a ratio of 1:1.036, then add 6.9% glucose, 4.3% methanol and 0.26% Ti(NO 3 ) 4 , after fully mixing, grinding for 7.5 hours, drying at 120°C with a dryer, and crushing with a crusher until the particle size is within the range of 1.5μm<D90<2.5μm to obtain the precursor②;

[0072] (3) The precursor ① and p...

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Abstract

The invention provides a preparation method for a lithium-iron phosphate cathode material. The preparation method comprises the following steps: (1) adding a first lithium source, a phosphorus source,an iron source and a first carbon source into a first solvent containing a complexing agent so as to obtain a mixed solution, carrying out uniform mixing under stirring at a temperature of 400 to 450DEG C, and carrying out drying and crushing treatment so as to obtain a precursor 1; (2) uniformly mixing iron phosphate particles with a second lithium source according to a molar ratio of 1: (1.03-1.1), then adding a second carbon source, a second solvent and doped metal salt, carrying out full mixing, then carrying out grinding for 3 to 8 hours, and carrying out drying and crushing treatment so as to obtain a precursor 2; (3) uniformly mixing the precursor 1 and the precursor 2 according to a mass ratio of 1: (0.5-3) so as to obtain a mixed precursor, and carrying out sintering at a high temperature in an inert or reducing atmosphere so as to obtain crude lithium-iron phosphate; and (4) crushing and drying the crude lithium-iron phosphate in an air-stream mill, and carrying out collection so as to obtain the lithium-iron phosphate cathode material. The invention also provides a lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation method of a lithium iron phosphate cathode material and a lithium ion battery. Background technique [0002] Due to its high volume energy density, mass energy density and excellent cycle performance, lithium-ion batteries are internationally recognized as ideal energy storage and output power sources, and are increasingly showing their important role in various fields. The quality of energy density is one of the important indicators to measure lithium-ion batteries, and the compaction density affects the energy density of the battery to a large extent. Theoretically, the energy density of the battery is proportional to the compaction density, and the greater the compaction density , the higher the battery capacity. At present, the compaction density of lithium iron phosphate on the market is generally low, generally 2.2-2.3g / cm 3 Between; and there are multip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M10/0525
CPCC01B25/45C01P2002/72C01P2004/03H01M4/5825H01M10/0525H01M2004/028Y02E60/10
Inventor 徐浩李意能刘其峰刘潘婵
Owner FOSHAN DYNANONIC
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