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Lithium ion battery cathode material antimony-doped lithium iron phosphate and preparation method thereof

A lithium-ion battery and lithium iron phosphate technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as low tap density, poor high-rate charge and discharge performance, and wide particle size distribution, achieving reduced complexity and high production efficiency. The effect of process stabilization

Active Publication Date: 2010-07-28
LASTING BRILLIANCE NEW ENERGY TECHNOLOGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are weaknesses such as poor electrochemical performance, wide particle size distribution, and low tap density.
If the tap density is generally only 1.0g / cm 3 About, far lower than lithium cobalt oxide (2.8g / cm 3 ) and lithium manganese oxide (2.2g / cm 3 ) level; and lithium iron phosphate has low conductivity and poor high-rate charge and discharge performance, which makes the practical application of the material more difficult
[0005] In order to improve the performance of lithium iron phosphate, it is generally doped, such as lithium doping (CN101540400), oxygen doping (CN1772604), transition element doping (CN1785799), rare earth doping (CN1785800, CN1830764) , phosphorus doping (CN1785823, CN101037195), etc., although the above method can partially improve the performance of lithium iron phosphate, it is not easy to realize large-scale industrial production

Method used

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  • Lithium ion battery cathode material antimony-doped lithium iron phosphate and preparation method thereof
  • Lithium ion battery cathode material antimony-doped lithium iron phosphate and preparation method thereof
  • Lithium ion battery cathode material antimony-doped lithium iron phosphate and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1 1040g lithium dihydrogen phosphate (LiH 2 PO 4 ), 1060g iron hydroxide (Fe(OH 3 )) and 16g antimony trioxide (Sb 2 o 3 ) adding an appropriate amount of deionized water, milling for 1 to 3 hours until the particle size is 1 micron; then using a flash dryer to obtain a spherical precursor at an air inlet temperature of 300°C and an outlet air temperature of 100°C; The above precursor was pretreated at 150°C for 10h in an inert atmosphere, then heated to 700°C and kept at a constant temperature for 15h, and cooled naturally to room temperature to obtain an antimony-doped lithium iron phosphate material with the nominal molecular formula LiFe 0.99 Sb 0.01 PO 4 . The XRD pattern of the product is shown in figure 1 As shown in , the material has an average particle size of 15 μm and a tap density of 1.4 g / cm 3 .

[0019] Reduce iron hydroxide (Fe(OH 3 )) and increasing antimony trioxide (Sb 2 o 3 ) amount, then the corresponding LiFe 0.93 Sb 0.07 PO ...

Embodiment 2

[0023] Embodiment 2 370g lithium carbonate (Li 2 CO 3 ), 1700g ferrous oxalate (FeC 2 o 4 2H 2 O), 1150g ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and 75g antimony trioxide (Sb 2 o 3 ) into an appropriate amount of deionized water, ultra-fine ball milling for 1-3 hours until the particle size is 0.5-1 micron; then use a flash dryer to obtain a spherical precursor at an air inlet temperature of 300°C and an outlet air temperature of 100°C body; the above precursor was pretreated at 200°C for 6h in an inert atmosphere, then heated to 800°C and kept at a constant temperature for 5h, and naturally cooled to room temperature to obtain an antimony-doped lithium iron phosphate material with the nominal molecular formula LiFe 0.95 Sb 0.05 PO 4 , the material is charged and discharged at a rate of 0.1C. When the charge and discharge voltage ranges from 2.0 to 4.2V, the capacity reaches 140mAh / g. After 20 cycles, the capacity remains good without obvious attenuation. LiF...

Embodiment 3

[0024] Example 3 420g lithium hydroxide (LiOH·H 2 O), 960g iron hydroxide (Fe(OH) 3 ), 1320g diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 ) and 146g antimony trioxide (Sb 2 o 3 ) adding an appropriate amount of deionized water, milling for 1 to 3 hours until the particle size is 1.5 microns; then using a flash dryer to obtain a spherical precursor at an air inlet temperature of 300°C and an outlet air temperature of 100°C; The above precursor was pretreated at 100°C for 12h in an inert atmosphere, then heated to 750°C and kept at a constant temperature for 10h, and cooled naturally to room temperature to obtain an antimony-doped lithium iron phosphate material with the nominal molecular formula LiFe 0.9 Sb 0.1 PO 4 . The material is charged and discharged at a rate of 0.1C. When the charge and discharge voltage ranges from 2.0 to 4.2V, the capacity reaches 136mAh / g. After 20 cycles, the capacity remains good without obvious attenuation.

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Abstract

The invention relates to antimony-doped lithium iron phosphate used for a lithium ion battery and a preparation method thereof, wherein the antimony-doped lithium iron phosphate has the nominal formula: LiFe1-xSbxPO4 (x is more than 0 but less than 0.2), and the method comprises the following steps: (1) weighting and mixing the compounds of lithium, iron, antimony and phosphorous according to the stoichiometry ratio of lithium, iron, antimony and phosphorous of 1:1-x:x:1, wherein x is more than 0 but less than 0.2, grinding the mixture to slurry with particles of 0.4-2 microns; (2) drying the ground slurry by a drying machine to prepare a precursor; and (3) pretreating the precursor for 6 to 12 hours at 100 to 200 DEG C in an inert atmosphere, then heating up to 700 to 800 DEG C under the protection of inert gas and keeping constant temperature for 5 to 15 hours, and naturally cooling to room temperature to obtain the antimony-doped lithium iron phosphate material. The antimony-doped lithium iron phosphate has the characteristics of high specific capacity, good circulation performance and safety and great easiness for industrial production.

Description

technical field [0001] The invention relates to an antimony-doped lithium iron phosphate lithium-ion battery cathode material and a preparation method thereof. The material is used for the cathode active material of the lithium-ion battery and belongs to the field of new energy materials. Background technique [0002] Lithium-ion battery, as a green energy in line with low-carbon economy, has the advantages of high energy, high voltage, long life, low self-discharge, and no memory effect, and is widely used in various fields. [0003] Cathode material is a key part that determines the performance of lithium-ion batteries. Today, with more emphasis on environmental protection and safety concepts, lithium iron phosphate has become a research and development hotspot in various countries. The material has many advantages such as high theoretical specific capacity (about 170mAh / g), non-toxicity, wide source of raw materials and abundant reserves, stable working voltage, stable s...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/58
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 张建农王庆军张红朱承飞
Owner LASTING BRILLIANCE NEW ENERGY TECHNOLOGY CO LTD
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