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Preparation for high vibration high density lithium iron phosphate

A technology of lithium iron phosphate and tap density, which is applied in chemical instruments and methods, spraying manufacturing, electrode manufacturing, etc., can solve the problems of unsatisfactory tap density and low volume specific capacity of lithium iron phosphate, and achieve superior material processing performance , low cost, simple implementation

Active Publication Date: 2009-07-08
OPTIMUM BATTERY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem of the present invention is: to overcome the disadvantages of the prior art in the preparation of lithium iron phosphate, the cathode material of lithium ion batteries, that the tap density is not ideal and the volume specific capacity is low, and to provide a method for preparing lithium iron phosphate with high tap density

Method used

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  • Preparation for high vibration high density lithium iron phosphate
  • Preparation for high vibration high density lithium iron phosphate
  • Preparation for high vibration high density lithium iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Take 0.05 mole of ferrous chloride and 0.05 mole of phosphoric acid (calculated according to the effective content of 85% phosphoric acid solution), dissolve them in 200ml deionized water, add 0.005 mole of complexing agent, stir continuously, slowly add The aqueous solution of lithium (calculated by the effective content of 5% concentration lithium hydroxide aqueous solution); Stir for 10 minutes, the solution produces green precipitate, green precipitate is washed repeatedly with deionized water, then green precipitate is carried out centrifugation with high-speed centrifuge; The separated solid was dried in a vacuum drying oven at 50° C. for 8 hours to obtain a precursor.

[0045] Add 1% acetylene black with a high specific surface area to the dried precursor, mix evenly in a vacuum mixer, then place the mixture in an inert gas protection furnace, and raise the temperature to 600°C at a heating rate of 5°C / min. After heat treatment for 10 hours, a uniformly dispersed...

Embodiment 2

[0050] Take 0.1 mole of ferrous sulfate and 0.1 mole of ammonium phosphate, dissolve them in 200ml of deionized water, add 0.01 mole of complexing agent, stir constantly, slowly add 0.1 mole of lithium chloride aqueous solution; stir for 60 minutes, the solution produces green precipitation, The green precipitate was repeatedly washed with deionized water, and then the green precipitate was centrifuged with a high-speed centrifuge; the separated solid was dried in a vacuum oven and dried at 80°C for 1 hour to obtain a precursor.

[0051] Add 5% carbon black with a high specific surface area to the dried precursor, mix evenly in a vacuum mixer, then place the mixture in an inert gas protection furnace, and raise the temperature to 800°C at a heating rate of 5°C / min , heat treatment for 1 hour to obtain a uniformly dispersed primary lithium iron phosphate material with a particle size of 100 nanometers.

[0052] Place the initial lithium iron phosphate material in a closed vacuu...

Embodiment 3

[0055] Take 0.08 mol of ferric ammonium sulfate and 0.08 mol of ammonium hydrogen phosphate, dissolve them in 200ml deionized water, add 0.007 mol of complexing agent, keep stirring, slowly add 0.15 mol of lithium sulfate aqueous solution; stir for 30 minutes, the solution produces green precipitate, The green precipitate was repeatedly washed with deionized water, and then the green precipitate was centrifuged with a high-speed centrifuge; the separated solid was dried in a vacuum oven and dried at 60°C for 4 hours to obtain a precursor.

[0056] Add 3% acetylene black with a high specific surface area to the dried precursor, mix evenly in a vacuum mixer, then place the mixture in a weakly reducing gas protection furnace, and heat up to Heat treatment at 600°C for 8 hours to obtain a uniformly dispersed initial lithium iron phosphate material with a particle size of 350 nm.

[0057] Place the initial lithium iron phosphate material in a closed vacuum container and stir it at ...

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Abstract

A preparation method of lithium iron phosphate with high tap density relates to the technical field of positive electrode active substance preparation of Li-ion battery. The method comprises the following two steps: firstly, synthesizing submicron-scale lithium iron phosphate powder by soft chemical method; and secondly, spraying a polymer solution into the lithium iron phosphate powder while stirring at high speed to granulate, and sintering. The positive electrode active substance lithium iron phosphate of the Li-ion battery prepared by the two-step method has high tap density of 1.5 g / cm, low specific surface area smaller than 10 m / g, and average particle size of 5 to 15 mum. The method has the advantages of simple implementation, low cost and excellent material processability, and suits industrial production.

Description

technical field [0001] The invention relates to the technical field of preparation of positive electrode active materials for lithium ion batteries. Background technique [0002] In lithium-ion batteries, the cathode material is the most important component and the key to determining the performance of lithium-ion batteries. Currently, the main cathode material is LiCoO 2 , LiNiO 2 , LiMn 2 o 4 . LiCoO 2 It is currently the only positive electrode material that has been industrialized and commercialized on a large scale, and more than 90% of lithium-ion batteries use this material. However, the Co used in this material is expensive, has a low capacity, and is highly toxic, and there are certain safety issues. LiNiO 2 The cost is low, the capacity is high, but the preparation is difficult, the thermal stability is poor, and there is a large potential safety hazard. Spinel LiMn 2 o 4 Low cost, good safety, but low capacity, poor high temperature cycle performance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01B25/45
CPCY02E60/12C01B25/375C01B25/45C01P2004/61C01P2006/11C01P2006/12C01P2006/40H01M4/0419H01M4/0471H01M4/0497H01M4/362H01M4/5825H01M4/625H01M10/052Y02E60/10
Inventor 赵兵李瑶
Owner OPTIMUM BATTERY CO LTD
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