Industrial preparation method for lithium iron phosphate

A lithium ferrous phosphate, industrial technology, applied in the field of lithium ferrous phosphate materials for lithium ion batteries and their manufacturing fields, can solve the problems of high energy consumption and low efficiency, and achieve the effects of high purity and improved grinding efficiency

Inactive Publication Date: 2011-01-26
BEIJING CENT PRESS UNION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems of high energy consumption and low efficiency in the industrial production of the existing lithium ion cathode material lithium ferrous phosphate, and provides an industrial preparation method of lithium ferrous phosphate

Method used

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  • Industrial preparation method for lithium iron phosphate
  • Industrial preparation method for lithium iron phosphate
  • Industrial preparation method for lithium iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 6.65g of lithium hydroxide, 29.61g of iron phosphate, and 4.40g of polyvinylpyrrolidone into 125g of water, ball mill at a speed of 300r / min for 2 hours, and then move to an oven. The temperature in the oven is 80°C. After drying, move to a heating furnace. The heating furnace was protected by Ar, and the temperature was raised to 350°C at 2°C / min, and then the temperature was raised to 650°C at 2°C / min after holding for 4 hours. After holding for 8 hours, it was cooled to obtain the lithium iron phosphate cathode material. Assemble the button battery to test the electrochemical performance of the lithium iron phosphate powder cathode material: the cathode sheet is LiFePO 4 : Acetylene black: PTFE (polytetrafluoroethylene) = 75: 20: 5, mixed evenly and then pressed into tablets. The polar piece was vacuum dried at 80°C for 12h. The counter electrode is metal lithium sheet, the separator is polypropylene porous membrane (Celgard-2400), and the electrolyte is 1.0mo...

Embodiment 2

[0030] Weigh 16.47g of lithium dihydrogen phosphate, 12.65g of ferric oxide, 5g of glucose and 0.315g of polyvinylpyrrolidone into 100g of water, ball mill at a speed of 600r / min for 6h, then move to an oven, the temperature in the oven is 100°C, and dry After moving to the heating furnace, the heating furnace passes N 2-Ar mixed gas protection, heat up to 400°C at 6°C / min, keep warm for 6h, cool to room temperature, take out the dry mill for 2h, move to the furnace and continue to pass N 2 -Ar mixed gas protection and heating up to 700°C at a rate of 6°C / min, and cooling for 10 hours to obtain lithium iron phosphate cathode material. Assemble the button battery to test the electrochemical performance of the lithium iron phosphate powder cathode material: the cathode sheet is LiFePO 4 : Acetylene black: PTFE (polytetrafluoroethylene) = 75: 20: 5, mixed evenly and then pressed into tablets. The polar piece was vacuum dried at 80°C for 12h. The counter electrode is metal lith...

Embodiment 3

[0032] Weigh 6.12kg of lithium dihydrogen phosphate, 29.61kg of iron phosphate, 3kg of sucrose and 0.315g of polyvinylpyrrolidone into 105kg of water, ball mill at a speed of 1200r / min for 12h, spray dry at 120°C, and move to a heating furnace after drying , through N in the heating furnace 2 Protection, heat up to 450°C at 10°C / min, keep warm for 10h, cool to room temperature, take out the dry mill for 6h, move to the furnace and continue to pass N 2 Protect and heat up to 750°C at 10°C / min, keep warm for 20 hours and cool to obtain lithium iron phosphate cathode material. Assemble the button battery to test the electrochemical performance of the lithium iron phosphate powder cathode material: the cathode sheet is LiFePO 4 : Acetylene black: PTFE (polytetrafluoroethylene) = 75: 20: 5, mixed evenly and then pressed into tablets. The polar piece was vacuum dried at 80°C for 12h. The counter electrode is a metal lithium sheet, the separator is a polypropylene porous membrane ...

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Abstract

The invention belongs to an energy material, and particularly relates to a method for preparing a lithium iron phosphate anode material suitable to be used by a power type lithium ion battery and the like by using PVP (polyvinylpyrrolidone) as a dispersant and a carbon source at the same time in an aqueous solution. The method comprises the following steps of: weighing a lithium source compound, an iron source compound and a phosphorus source compound in a weight ratio, adding the compounds into water, adding a proper amount of PVP into the mixture, grinding the mixture for certain time, drying the mixture, transferring the obtained precursor into an atmosphere protection furnace, treating the precursor for certain time at a high temperature under inert atmosphere, and cooling the product to obtain the lithium iron phosphate. By observing, one-time particles are uniform and fine, and the first discharge capacity is 157.6mAh / g. The method has the advantages of low energy consumption, high grinding efficiency and environment-friendly and pollution-free production process, and is an excellent method for synthesizing a green new energy source material. The prepared material has the advantages of uniform particle size distribution, good circulating stability and prominent magnification performance, and is a battery anode material suitable for high-capacity energy storage equipment such as substations and the like and large-sized mobile equipment such as electric automobiles and the like.

Description

Technical field: [0001] The invention belongs to the technical field of green energy materials, and in particular relates to a lithium iron phosphate material for lithium ion batteries and a manufacturing method thereof. Background technique: [0002] Compared with traditional chemical power sources, lithium-ion batteries have the advantages of high voltage, high capacity, no memory effect, less self-discharge, and good high-temperature performance, and have been generally valued by people. Since the 1990s, LiCoO has been used in more than 90% of the positive electrode materials of commercialized lithium-ion batteries. 2 , but the Co content is limited, the price is expensive, and the toxicity is high, and the hidden safety hazards are becoming more and more prominent, so a new type of secondary chemical power source is urgently required. LiNiO 2 Once considered to be a substitute for LiCoO 2 , but it has the disadvantages of difficult preparation, poor cycle life and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 马平平夏定国刘振刚陈宇胡朴
Owner BEIJING CENT PRESS UNION TECH
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