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Method for preparing lithium iron phosphate by using wood fibers as carbon source

A technology of lignocellulose and lithium iron phosphate, applied in chemical instruments and methods, phosphorus compounds, non-metallic elements, etc., can solve the problems of unsatisfactory ion and electronic conductivity, increase production cost, increase production difficulty, etc., and achieve good The effect of application prospect, low cost and excellent cycle performance

Inactive Publication Date: 2013-03-27
TONGLING JINTAI BATTERY MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium iron phosphate material itself also has inherent defects, and its ionic and electronic conductivity is not ideal, so its performance is poor under low temperature and high current charging and discharging conditions.
In addition, the iron in lithium iron phosphate is divalent iron, if the divalent iron source is used as the production raw material, it will increase the difficulty of production and increase the production cost

Method used

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  • Method for preparing lithium iron phosphate by using wood fibers as carbon source
  • Method for preparing lithium iron phosphate by using wood fibers as carbon source
  • Method for preparing lithium iron phosphate by using wood fibers as carbon source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Add 0.025mol lithium carbonate, 0.025mol iron oxide, 0.05mol ammonium dihydrogen phosphate, 0.5~2g lignocellulose into the ball mill tank, add 40ml acetone, and mix for 24 hours by wet ball milling.

[0020] 2. Dry the slurry after wet ball milling at 120°C for 2 hours until completely dry.

[0021] 3. Pre-burn at 350°C for 10 hours under the protection of an inert atmosphere. After the pre-fired material is fully ground, it is again placed under an inert protective atmosphere and sintered at 600-650°C for 5-15 hours.

[0022] 4. The sintered product is ground to obtain lithium iron phosphate powder.

[0023] 5. Characterization of results:

[0024] (1) by the attached figure 1 It can be seen that the final products obtained under various conditions are lithium iron phosphate with a pure phase olivine structure, and no obvious crystal phase impurities exist.

[0025] (2) by the attached figure 2 It can be seen that the primary particles of the product are spher...

Embodiment 2

[0028] 1. Add 0.025mol lithium carbonate, 0.05mol ferrous oxalate, 0.05mol ammonium dihydrogen phosphate, 0.5~2g lignocellulose into the ball mill tank, add 40ml acetone, and mix for 24 hours by wet ball milling.

[0029] 2. Dry the slurry after wet ball milling at 120°C for 2 hours until completely dry.

[0030] 3. Pre-burn at 350°C for 10 hours under the protection of an inert atmosphere. After the pre-fired material is fully ground, it is again placed under an inert protective atmosphere and sintered at 600-650°C for 5-15 hours.

[0031] 4. The sintered product is ground to obtain lithium iron phosphate powder.

[0032] 5. Characterization of results:

[0033] (1) by the attached image 3 It can be seen that the final product obtained is lithium iron phosphate with a pure phase olivine structure, and no obvious crystal phase impurities exist.

[0034] (2) by the attached figure 2 It can be seen that the primary particles of the product are spherical in shape, with an ...

Embodiment 3

[0037] 1. Add 0.05mol lithium dihydrogen phosphate, 0.025mol iron oxide, 0.5~2g lignocellulose into the ball mill, add 40ml acetone, and mix for 2 hours by wet ball milling.

[0038] 2. Dry the slurry after wet ball milling at 120°C for 2 hours until completely dry.

[0039] 3. Pre-burn at 350°C for 10 hours under the protection of an inert atmosphere. After the pre-fired material is fully ground, it is again placed under an inert protective atmosphere and sintered at 600-650°C for 5-15 hours.

[0040] 4. The sintered product is ground to obtain lithium iron phosphate powder.

[0041] 5. Characterization of results:

[0042] (1) by the attached image 3 It can be seen that the final product obtained is lithium iron phosphate with a pure phase olivine structure, and no obvious crystal phase impurities exist.

[0043] (2) by the attached figure 2 It can be seen that the primary particles of the product are spherical in shape, with an average particle diameter of about 500 ...

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Abstract

The invention discloses a method for preparing lithium iron phosphate by using wood fibers as a carbon source, which comprises the following steps: adding a lithium source, an iron source and a phosphorus source into a ball milling tank according to the element ratio of 1:1:1, adding lignocellulose which accounts for 5-35% by mass of the yield of the lithium iron phosphate, evenly mixing by wet ball milling, and ensuring that the carbon content in the final lithium iron phosphate product is 0-10% by mass; drying in the air, thoroughly grinding, and presintering under the protection of an inert atmosphere; and thoroughly grinding the presintered material, sintering the material in an inert protective atmosphere, and grinding the sintered product to obtain the lithium iron phosphate powder. The method disclosed by the invention is used for preparing a compound LiFePO4 by using wood fibers as a carbon source. The method is simple and feasible, and has the advantage of low cost; and the prepared product has the advantages of high electric conductivity and excellent electrochemical properties, and has broad market application prospects.

Description

technical field [0001] The invention relates to a preparation method of an electrode material for a lithium ion battery, more specifically a method for preparing lithium iron phosphate by using lignocellulose as a carbon source. Background technique [0002] Since Sony first launched commercial lithium-ion batteries in 1991, after 20 years of development, lithium-ion batteries have been characterized by their high open circuit voltage, long cycle life, high energy density, low self-discharge, no memory effect, and environmental friendliness. It is widely used in all aspects of people's work, study and life. In recent years, with the increasing market demand for power batteries and large-scale power energy storage devices, power and energy storage power sources using lithium-ion batteries as carriers have emerged one after another. Due to the obvious defects in cost, environmental friendliness, and safety of the traditional cathode material lithium cobalt oxide, its market a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/45
Inventor 陈春华张临超李斯蓉唐拔明段浩
Owner TONGLING JINTAI BATTERY MATERIAL