Chemical method for preparing nano iron phosphate lithium as anode material of lithium ion battery

A lithium ion battery, lithium iron phosphate technology, applied in battery electrodes, circuits, electrode manufacturing and other directions, can solve the problems of uneven mixing of reactants, unfavorable industrial production, irregular product morphology, etc., achieving easy control of phase composition, The effect of excellent electrical conductivity and electrochemical performance and easy parameter control

Inactive Publication Date: 2010-06-30
孙琦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the high temperature method has the advantages of simple process and easy industrialization, but the disadvantages are that the reactants are not mixed uniformly, the product has irregular shape, the particle size is micron, and the distribution is not uniform.
The hydrothermal method is relatively easy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] Prepare 0.5mol / l lithium chloride, 0.5mol / l ferrous chloride, 0.5mol / l hydrogen phosphate diamine, mix the three solutions, add 5mol / l ammonia solution dropwise to the mixed solution, stirring constantly, Form a suspension. The suspension was poured into the reactor, the temperature was raised to 80°C, and the reaction time was 5 hours. Take out, filter, wash, and dry to obtain the precursor product. Put the precursor product into a high-temperature furnace, pass nitrogen protection, set the parameters, heat up to 500°C at a heating rate of 10°C / min, and keep the temperature for 12 hours. After cooling down to room temperature, the product is taken out to obtain nano-scale lithium iron phosphate powder. Weigh lithium iron phosphate powder, acetylene black, and PVDF at a mass ratio of 82:8:10, and uniformly make electrodes after grinding, using lithium metal as the negative electrode, and the electrolyte is dissolved in ethyl carbonate and diethyl carb...

Example Embodiment

[0022] Example 3

[0021] Configure 0.8mol / l lithium acetate, 1.0mol / l iron acetate, 1.0mol / l hydrogen phosphate diamine, mix the three solutions, add 6mol / l ammonia solution dropwise to the mixed solution, stir continuously to form a suspension liquid. The suspension was poured into the reactor, the temperature was raised to 90°C, and the reaction time was 8 hours. Take out, filter, wash, and dry to obtain the precursor product. Put the precursor product into a high-temperature furnace, pass argon protection, set the parameters, heat up to 600°C at a temperature rise rate of 10°C / min, and keep the temperature for 12 hours. After cooling down to room temperature, the product is taken out to obtain nano-scale lithium iron phosphate powder. Weigh lithium iron phosphate powder, acetylene black, and PVDF at a mass ratio of 82:8:10, and uniformly make electrodes after grinding, using lithium metal as the negative electrode, and the electrolyte is dissolved in ethyl carbonate and di...

Example Embodiment

[0022] Example 3

[0023] Prepare 0.55mol / l lithium carbonate, 1.0mol / l ferrous chloride, 1.0mol / l dihydrogen phosphate, mix the three solutions, add 8mol / l ammonia aqueous solution dropwise to the mixed solution, and keep stirring to form Suspension. The suspension was poured into the reactor, the temperature was raised to 100°C, and the reaction time was 10 hours. Take out, filter, wash, and dry to obtain the precursor product. Put the precursor product into a high-temperature furnace, pass in nitrogen protection, set the parameters, heat up to 800°C at a heating rate of 10°C / min, and keep the temperature for 24 hours. After cooling down to room temperature, the product is taken out to obtain nano-scale lithium iron phosphate powder. Weigh lithium iron phosphate powder, acetylene black, and PVDF at a mass ratio of 82:8:10, and uniformly make electrodes after grinding, using lithium metal as the negative electrode, and the electrolyte is dissolved in ethyl carbonate and dieth...

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PUM

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Abstract

The invention relates to a chemical method for preparing nano iron phosphate lithium as anode material of lithium ion battery, which belongs to the technical field of new energy materials. The chemical method comprises the following technological steps: preparing the solutions of a lithium compound, an iron compound and a phosphorous compound, mixing the three solutions in the mol ratio of Fe:Li:P=(0.8-1.5):1:1, dropwise adding a prepared ammonia solution into the mixed solution, and stirring the solution continuously to form a suspension; pouring the suspension into a reactor, heating to 70-100 DGE C, reacting for 5-10 h, taking out the products to filter and wash, and drying to obtain a precursor product; putting the precursor product into a high temperature furnace, heating to 500-800 DEG C under the protection of inert gas or reducing gas, and maintaining the temperature for 12-24 h; cooling to room temperature, and taking out the product to obtain the nano iron phosphate lithium powder. The preparation method has the advantages of simple synthesis technology and low cost, the particle diameter of the prepared iron phosphate lithium powder is controlled at nano level, and the electric conductivity and the electrochemical performance of the power are improved.

Description

technical field [0001] The invention relates to a chemical method for preparing lithium iron phosphate, a cathode material of a nanoscale lithium ion battery, and belongs to the technical field of new energy materials. Background technique [0002] In recent years, lithium-ion batteries have developed rapidly, and cathode materials are an important part of lithium-ion batteries. The research on new cathode materials and that have become the key to the development of lithium-ion batteries. At present, the cathode material commercialized on a large scale is LiCoO2, but it is toxic, cobalt is expensive, and there are certain safety problems. LiNiO2 has low cost and high capacity, but its preparation process is complicated and its thermal stability is poor. Spinel LiMn2O4 has low cost and good safety performance, but low capacity and poor high temperature cycle performance. The new lithium ion battery cathode material LiFePO4 has the advantages of low price, high capacity, goo...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/58
CPCY02E60/12Y02E60/10
Inventor 孙琦朱小奕胡章勇
Owner 孙琦
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