High-compaction-density lithium iron phosphate and preparation method thereof

A technology of lithium iron phosphate and iron phosphate, which is applied in the field of electrode material synthesis, can solve the problems of reducing equipment production capacity, increasing manufacturing costs, and cumbersome processes, and achieves the effects of low cost, high specific capacity, and simple process

Inactive Publication Date: 2017-10-17
BTR (TIANJIN) NANO MATERIAL MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the lithium iron phosphate lithium ion battery produced by this method has many advantages such as high charge and discharge efficiency, good cycle stability, high compaction density, large electrochemical gram capacity and good cycle performance, the method is prepared by three-stage sintering method. Lithium iron phosphate, the process is more cumbersome, multiple sintering will also increase the manufacturing cost and reduce the production capacity of the equipment

Method used

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  • High-compaction-density lithium iron phosphate and preparation method thereof
  • High-compaction-density lithium iron phosphate and preparation method thereof
  • High-compaction-density lithium iron phosphate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] (1) Select iron phosphate A with a particle size of 3 μm and iron phosphate B with a particle size of 0.1 μm, and mix iron phosphate A and B according to a mass ratio of 3:7 to obtain mixed iron phosphate C;

[0066] Wherein, the scanning electron microscope (scanning electronmicroscope, SEM) figure of the iron phosphate A with the primary particle size of 3 μm is as attached figure 1 As shown, from the electron microscope picture, the primary particle size of the material is about 3 μm;

[0067] The SEM image of the iron phosphate B with a primary particle size of 0.1 μm is as attached figure 2 As shown, from the electron microscope picture, the primary particle size of the material is about 0.1 μm;

[0068] (2) Lithium carbonate and mixed iron phosphate C are mixed according to a molar ratio of 1:1, and glucose that accounts for 15% of the weight of the lithium iron phosphate precursor is added for mixing. Ethanol) 50% of total mass adds ethanol and grinds, takes o...

Embodiment 2

[0072] (1) Select iron phosphate A with a particle size of 1 μm and iron phosphate B with a particle size of 0.05 μm, and mix iron phosphate A and B according to a mass ratio of 1:9 to obtain mixed iron phosphate C;

[0073] (2) Lithium acetate, mixed iron phosphate C, and manganese acetate are mixed according to a molar ratio of 1:1:0.01, and citric acid accounting for 1% of the weight of the lithium iron phosphate precursor is added for mixing, according to the materials (lithium acetate, mixed phosphoric acid 50% of the total mass of iron C, manganese acetate, citric acid and ethanol) plus ethanol for grinding, take out the slurry after 2h, and test the slurry particle size D 50 =0.95 μm, dry the slurry at 80°C to obtain lithium iron phosphate precursor powder;

[0074] (3) Put the dried powder in N 2 Under the atmosphere, the temperature is raised at a heating rate of 5°C / min, and the temperature reaches 650°C for 15 hours to obtain sintered lithium iron phosphate, and th...

Embodiment 3

[0076] (1) Select iron phosphate A with a primary particle size of 0.6 μm, and iron phosphate B with a primary particle size of 0.2 μm, and mix iron phosphate A and B according to a mass ratio of 5:5 to obtain mixed iron phosphate C;

[0077] (2) Lithium hydroxide, mixed iron phosphate C, and magnesium oxide are mixed according to a molar ratio of 1:1:0.025, and sucrose with 8% of the weight of the precursor is added for mixing, according to the materials (lithium hydroxide, mixed iron phosphate C, 50% of the total mass of magnesium oxide, sucrose and ethanol) is added with ethanol to grind, take out the slurry after 5h, and test the slurry particle size D 50 =0.49 μm, dry the slurry at 80°C to obtain lithium iron phosphate precursor powder;

[0078] (3) Put the dried powder in N 2 Under the atmosphere, the temperature is raised at a heating rate of 2°C / min, and the temperature reaches 800°C for 6 hours to obtain sintered lithium iron phosphate, and the sintered lithium iron ...

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Abstract

The invention discloses high-compaction-density lithium iron phosphate and a preparation method thereof. The preparation method includes that an iron phosphate material mixed with large particles and small particles is mixed with a lithium source, a lithium iron phosphate precursor with iron phosphate as a skeleton is obtained by further grinding, and the high-compaction-density lithium iron phosphate can be obtained through calcination. The maximum available compaction density of a pole piece produced from the obtained lithium iron phosphate is between 2.3g / cm<3> and 2.45g / cm<3>; a battery prepared by taking the high-compaction-density lithium iron phosphate as a cathode active material is high in specific capacity and good in cycle performance, 1C discharge is above 140mAh / g, and the cycle of the average value of cycling to less than 80% of the capacity of the first three cycles is above 3895; in addition, the preparation method is simple in process and high in operability, requirements of current industry fields on the compaction density of the cathode material can be met, and good cost advantage can be provided.

Description

technical field [0001] The invention belongs to the field of electrode material synthesis, and relates to a lithium iron phosphate cathode material and a preparation method thereof, in particular to a high compacted density lithium iron phosphate and a preparation method thereof. Background technique [0002] In recent years, with the increasing impact of fossil energy on the earth's environment, clean energy is being widely used as an alternative, and new energy batteries, which are the main components of clean energy, are gradually becoming the field of electric energy storage for passenger cars, buses and energy storage first choice. [0003] At present, new energy batteries are mainly composed of lithium iron phosphate batteries, ternary batteries and high-nickel batteries. Among them, lithium iron phosphate batteries are difficult to decompose due to their strong P-O bonds in the positive electrode material, even at high temperatures or when overcharged. Like the posit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCH01M4/5805Y02E60/10
Inventor 席小兵刘倩孟少敏杨才德黄友元
Owner BTR (TIANJIN) NANO MATERIAL MFG CO LTD
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