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Preparation of spherical lithium iron phosphate material and lithium ion battery using spherical lithium iron phosphate material

A lithium-ion battery and lithium iron phosphate technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of wide particle size distribution range, hindering the application of materials, and large crystal particle size, so as to simplify the ball milling process and improve Processability, effect of uniform particle size distribution

Active Publication Date: 2011-01-12
HENAN KELONG NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are relatively large shortcomings in the above-mentioned method: one is that the product particle size distribution range is wide, the crystal particle size is large, the powder is irregular particles, and the bulk density is low. Generally, the tap density is only 1.0g / cm3, which is far lower than the current lithium cobaltate ( The tap density of 2.8g / cm3), lithium manganese oxide (2.4g / cm3), ternary material (2.2g / cm3), and the low bulk density make the volume capacity ratio of lithium iron phosphate much lower than other lithium ion cathode materials , hindering the application of the material in the field of power

Method used

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  • Preparation of spherical lithium iron phosphate material and lithium ion battery using spherical lithium iron phosphate material
  • Preparation of spherical lithium iron phosphate material and lithium ion battery using spherical lithium iron phosphate material
  • Preparation of spherical lithium iron phosphate material and lithium ion battery using spherical lithium iron phosphate material

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Effect test

Embodiment 1

[0022] Measure 1000ml deionized water, put it into a beaker, weigh 1215g iron nitrate (Fe(NO 3 ) 3 9H 2 O) and 6.5gMgCl 2 Dissolve in deionized water to prepare solution A, then measure 1000ml deionized water, put it into another beaker, weigh 355g ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ), to prepare solution B. Get another beaker, the ammonia solution that 1000ml concentration is housed is 3.5mol / L, as complexing agent C. Then solution A, solution B and complexing agent C were pumped into the reaction kettle at a flow rate of 80ml / min through a metering pump, and then reacted for 10 hours at a temperature of 70°C, and the rotation speed of the reaction kettle was 85r / min. After the reaction is finished, the precipitate is centrifugally filtered, washed and dried to obtain spherical ferric phosphate.

[0023] Weigh 450g iron phosphate (FePO 4 2H 2 O), 270g lithium carbonate (Li 2 CO 3 ), 50g of glucose and 45g of sucrose were added to the ball mill, and ball m...

Embodiment 2

[0026] Measure 1000ml deionized water, put it into a beaker, weigh 1215g iron nitrate (Fe(NO 3 ) 3 9H 2 O) and 6gAlCl 3 Dissolve in deionized water to prepare solution A, then measure 1000ml deionized water, put it into another beaker, weigh 355g ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ), the solution B prepared. Get another beaker, the ammonia solution that 1000ml concentration is housed is 3.5mol / L, as complexing agent C. Then solution A, solution B and complexing agent C were pumped into the reaction kettle at a flow rate of 80ml / min through a metering pump, and then reacted for 10 hours at a temperature of 70°C, and the rotation speed of the reaction kettle was 85r / min. After the reaction is finished, the precipitate is centrifugally filtered, washed and dried to obtain spherical ferric phosphate.

[0027] Weigh 450g iron phosphate (FePO 4 2H 2 O), 270g lithium carbonate (Li 2 CO 3 ), 45g of glucose and 40g of sucrose were added into a ball mill and milled ...

Embodiment 3

[0030] Measure 1000ml deionized water, put it into a beaker, weigh 1215g iron nitrate (Fe(NO 3 ) 3 9H 2 O and 9gTiCl 4 Dissolve in deionized water to prepare solution A, then measure 1000ml deionized water, put it into another beaker, weigh 355g ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ), to prepare solution B. Get another beaker, the ammonia solution that 1000ml concentration is housed is 3.5mol / L, as complexing agent C. Then solution A, solution B and complexing agent C were pumped into the reaction kettle at a flow rate of 80ml / min through a metering pump, and then reacted for 10 hours at a temperature of 70°C, and the rotation speed of the reaction kettle was 85r / min. After the reaction is finished, the precipitate is centrifugally filtered, washed and dried to obtain spherical ferric phosphate.

[0031] Weigh 450g iron phosphate (FePO 4 2H 2 O), 270g lithium carbonate (Li 2 CO 3 ), 55g of glucose and 40g of sucrose were added to the ball mill, and ball mill...

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Abstract

The invention relates to preparation of a high-property spherical lithium iron phosphate material and manufacturing of a lithium ion battery using the material. In the invention, high-density spherical lithium iron phosphate is synthesized by synthesizing a spherical iron phosphate precursor first and then calcining the spherical iron phosphate precursor together with a lithium source and a carbon source. Moreover, in the synthesis process of the iron phosphate precursor, metal ions are doped into the precursor to improve the multiplying power performance of the material. The synthesized high-performance spherical lithium iron phosphate has the advantages of uniform grain size distribution, high tap density (over 1.9g / cm3), high safety performance and high specific volume. The material is used as an anode, artificial graphite is used as a cathode, a polypropylene and polyethylene composite film is used as a diagraph, an organic solvent of lithium salt is taken as electrolyte, and the capacitance of the anode material is as high as 150mAh / g.

Description

technical field [0001] The invention relates to a high-magnification, high-density spherical lithium iron phosphate and a lithium ion secondary battery using the lithium iron phosphate. Background technique [0002] Lithium-ion battery is a new generation of green high-energy power supply. Since its launch in 1990, it has the advantages of high specific energy, long cycle life, no memory effect, small self-discharge and wide operating temperature range. It has been widely used in various Power banks for portable electronics and small power tools. With the decrease of non-renewable energy sources, human beings pay more and more attention to renewable energy technologies, and renewable energy technologies emerge in endlessly. Among them, for automobiles, with the reduction of petroleum and the emission of discarded automobiles, people expect a new type of renewable energy to replace petroleum. Lithium-ion batteries are one of the first choices of energy for electric vehicles....

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/04H01M4/58H01M10/38H01M10/40
CPCY02E60/10Y02P70/50
Inventor 王明强徐拥军崔文化程迪卞鸿彦魏玲
Owner HENAN KELONG NEW ENERGY CO LTD
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