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Method for preparing lithium iron phosphate of anode material of lithium ion battery

A technology for lithium ion batteries and positive electrode materials, which is applied in the field of preparation of lithium iron phosphate, a positive electrode material for lithium ion batteries, can solve the problems of complicated process steps, irregular shapes of products, and difficulty in large-scale production, and achieves reasonable process, The effect of improving the lithium ion diffusion coefficient and easy process control

Inactive Publication Date: 2010-02-10
赵兵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing solid-phase method has high synthesis temperature, high energy consumption, irregular shape of the product, wide particle size distribution, low tap density, cumbersome process steps, high cost of raw materials, and difficulty in industrialization.
Although other synthetic methods can obtain small and evenly distributed particles, they are difficult to produce on a large scale due to high equipment requirements, low yield, and difficult step control.

Method used

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  • Method for preparing lithium iron phosphate of anode material of lithium ion battery
  • Method for preparing lithium iron phosphate of anode material of lithium ion battery
  • Method for preparing lithium iron phosphate of anode material of lithium ion battery

Examples

Experimental program
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Embodiment 1

[0031] A preparation method of lithium iron phosphate lithium ion battery cathode material, the method comprising:

[0032] Lithium, iron, phosphorus and magnesium are respectively weighed lithium hydroxide monohydrate, ferrous oxalate, phosphoric acid and magnesium hydroxide according to the molar ratio of 1.05:1:1:0.05, and lithium hydroxide monohydrate, ferrous oxalate 5 times the weight of iron and phosphoric acid in deionized water, add lithium hydroxide monohydrate and magnesium hydroxide to deionized water, add phosphoric acid and mix, adjust pH=3.2 by adding oxalic acid and ammonia water. Add corresponding sucrose according to the theoretical carbon content of 3wt% in the final product, dissolve it completely, stir and mix evenly, add ferrous oxalate and mix evenly to obtain a mixed slurry, and quickly dry to obtain a reaction precursor;

[0033] After ball milling on the planetary ball mill for 2h, it was transferred to a tube furnace at 95v%Ar+5v%H 2 In the atmosphe...

Embodiment 2

[0039] A preparation method of lithium iron phosphate lithium ion battery cathode material, the method comprising:

[0040]Lithium, iron, and phosphorus are respectively weighed lithium acetate, ferrous acetate, and phosphoric acid according to a molar ratio of 1:1:1, and the phosphoric acid is diluted with deionized water that is twice the weight of lithium acetate, ferrous acetate, and phosphoric acid, and then Add lithium acetate while stirring, and adjust the pH of the solution to 3.2 by adding acetic acid and urea dropwise. After the solution system is stable, add the corresponding epoxy resin according to the carbon content of 6wt%, to make it all dissolve, stir and mix evenly, and dry quickly , to obtain a complex containing lithium and phosphorus;

[0041] Mix the obtained composite powder with ferrous acetate evenly to obtain a precursor. After ball milling for 4 hours, transfer it to a tube furnace in N 2 In the atmosphere, the precursor was pre-fired at 350°C for 1...

Embodiment 3

[0046] A preparation method of lithium iron phosphate lithium ion battery cathode material, the method comprising:

[0047] Lithium, iron, phosphorus and zirconium were weighed lithium hydroxide, ferric oxide, ammonium dihydrogen phosphate and zirconium acetate respectively according to the molar ratio of 1:1:1:0.1, and the ammonium dihydrogen phosphate and lithium hydroxide The two raw materials were respectively dissolved in deionized water with six times the weight of lithium hydroxide, ferric oxide, and ammonium dihydrogen phosphate, and then the two solutions were slowly mixed, zirconium acetate was added, and the pH was adjusted to 3.5 by adding oxalic acid. According to the final product Add the corresponding polyvinyl alcohol with a carbon content of 15wt% to dissolve it completely, stir and mix evenly, add ferric oxide to obtain a uniform slurry, and use a rapid drying method to obtain a reaction precursor with uniform distribution of lithium, iron, and phosphorus. . ...

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Abstract

The invention relates to a method for preparing lithium iron phosphate of an anode material of a lithium ion battery. The method synthesizes a reactive precursor under the liquid-phase condition and calcines the precursor at high temperature to prepare the lithium iron phosphate of the anode material of the lithium ion battery, and comprises the following steps: dissolving a lithium source, a phosphorus source compound and a doped element compound in deionized water; adjusting the pH value of the mixture between 2 and 4; and after carrying out sufficient reaction, adding the conductive organicprecursor and an iron source compound into the reacted mixture and stirring and mixing the obtained mixture evenly to obtain a mixture containing lithium, iron and phosphorus and doped metal elements, and then calcining the mixture to obtain the lithium iron phosphate of the anode material of the lithium ion battery. Compared with the prior art, the method has reasonable process and simple operation, well controls the chemical composition of the material and the shape and size of granules through simple process steps, improves the electrical conductivity and the lithium-ion diffusion rate ofthe material, greatly improves the magnification charge-discharge and cycle performance of the synthesized material, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to a lithium ion battery positive electrode material, in particular to a preparation method of lithium iron phosphate, a lithium ion battery positive electrode material. Background technique [0002] Since Padhi et al. reported lithium iron phosphate (LiFePO 4 ) can be used as the positive electrode material of lithium-ion batteries, because this new type of material has the advantages of high theoretical specific capacity (170mAh / g), moderate voltage (3.4V), environmental friendliness, good safety performance, and low price, it has become a new type of material. A strong competitor of the first generation of cathode materials and a research hotspot in the world. However, its development and large-scale applications are hindered by the disadvantages of pure-phase LiFePO 4 such as low conductivity and low lithium ion mobility. LiFePO 4 Industrialization must have the following three points: (1) develop a low-cost preparation met...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/48H01M4/04C01B25/45
CPCY02E60/12Y02E60/10
Inventor 赵兵蒋永庄华
Owner 赵兵
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