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Nano-lithium iron phosphate material suitable for high rate power battery and preparation method thereof

A lithium iron phosphate and power battery technology, applied in the field of nano-lithium iron phosphate materials, can solve problems such as low electronic conductivity and ionic conductivity, reduced battery capacity, and poor material rate characteristics, and achieve improved conductivity and electrical performance. , The effect of high product controllability

Inactive Publication Date: 2013-07-31
宜兴奕润新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Although the above method is LiFeP0 4 There are many methods for preparing improvements, but each has disadvantages, and LiFeP0 4 It has the disadvantages of low electronic conductivity and ionic conductivity, and usually the prepared materials have poor rate characteristics, that is to say, when the battery is charged and discharged with a large current, the battery capacity is significantly reduced compared with that of a small current (for example, less than 70%)

Method used

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  • Nano-lithium iron phosphate material suitable for high rate power battery and preparation method thereof
  • Nano-lithium iron phosphate material suitable for high rate power battery and preparation method thereof
  • Nano-lithium iron phosphate material suitable for high rate power battery and preparation method thereof

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Effect test

Embodiment 1

[0034] Put ferrous oxalate (1177g), lithium carbonate (263g), ferric dihydrogen ammonium phosphate (1250g), glucose (500g), isopropanol (6000g) in a ball mill for 3 hours, and then ultrafine in a sand mill Grind for 3 hours, then dry in a double-cone vacuum dryer for 4 hours to obtain the precursor. The D50 of the precursor is 0.4~0.8um; Melt and burn at 700°C for 20 hours, cool to room temperature at a cooling rate of 4°C / min to obtain lithium iron phosphate; then pass through a jet mill for 10 minutes, and finally mix with a double-helix conical mixer for 2 hours to obtain iron phosphate Lithium products.

[0035] Such as figure 1 As shown, the X-ray diffraction analysis results show that the prepared lithium iron phosphate is olivine type lithium iron phosphate;

[0036] figure 2 Scanning electron microscope photos show that the primary particles are between 50~100nm, the particles are spherical, and the aspect ratio is 1.3~1. image 3 Transmission electron microscope ...

Embodiment 2

[0041] Put ferrous oxalate (1798g), lithium dihydrogen phosphate (1046g), glucose (400g), and isopropanol (6000g) in a ball mill for 3 hours, then grind them ultrafinely in a sand mill for 3 hours, and then grind them in a double Dry in a cone vacuum dryer for 4 hours to obtain the precursor, the precursor D50 is 0.4~0.8um; then use nitrogen as the protective gas in a pusher furnace, heat up at a heating rate of 2°C / min, and burn at a constant temperature of 720°C for 20 Hours, cooled to room temperature at a cooling rate of 4°C / min to obtain lithium iron phosphate; then pulverized by a jet mill for 10 minutes, and finally mixed for 2 hours by a double-helix conical mixer to obtain a finished product of lithium iron phosphate. The synthesized LiFeP04 / The C material and metal lithium sheet were assembled into a test battery. When discharged at a rate of 1C, the reversible specific capacity reached 153mAh / g.

Embodiment 3

[0043] Put ferrous oxalate (1750g), lithium dihydrogen phosphate (1046g), glucose (400g), niobium oxide (18g), and isopropanol (6000g) in a ball mill for 3 hours, and then grind them ultra-finely in a sand mill 3 hours, and then dried in a double-cone vacuum dryer for 4 hours to obtain the precursor. The D50 of the precursor is 0.4~0.8um; Melting at a constant temperature of 720°C for 20 hours, cooling to room temperature at a cooling rate of 4°C / min to obtain lithium iron phosphate; then pulverized by a jet mill for 10 minutes, and finally mixed for 2 hours by a double-helix conical mixer to obtain lithium iron phosphate The finished product, the synthesized LiFeP04 / C material and metal lithium sheet are assembled into a test battery, and the reversible specific capacity reaches 155mAh / g when discharged at a rate of 1C.

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Abstract

The invention relates to the battery field, specifically to a nano-lithium iron phosphate material suitable for a high rate power battery and a preparation method thereof. The elements of the lithium iron phosphate satisfy the relation that: a doped element, lithium, iron and phosphorus are in a mole ratio of 0-0.05:1-1.15:1:1-1.15. The preparation method includes: taking an organic solvent as a dispersing agent, carrying out wet ball-milling, ultrafine grinding and vacuum drying to prepare a precursor, and conducting pretreatment, constant temperature treatment, crushing, sieving, and mechanical fusion. The product has high controllability, and compared with traditional lithium iron phosphate batteries, the rate performance, cycle performance, capacity and other electrical properties are greatly improved. The method greatly increases the industrialization possibility, and is of practical significance.

Description

[0001] technical field [0002] The invention relates to the field of batteries, in particular to a nano-lithium iron phosphate material and a method for preparing nano-lithium iron phosphate by using an organic solvent as a dispersant, ultrafine grinding, and a high-temperature solid-phase synthesis process. Background technique [0003] Since A.K.Padhi first reported LiFeP0 in 1997 4 Since it has the function of deintercalating lithium, the olivine phosphate lithium intercalation material, LiFeP0 4 (M: Mn, Fe, Co, Ni), as a potential cathode material for carp ion batteries, has attracted much attention. LiFeP0 with a theoretical capacity of 170rnAh / g 4 , with its rich iron resources, low price, excellent thermal stability and environmental friendliness, is considered to be the most promising cathode material for lithium-ion batteries. [0004] At present, the methods for synthesizing lithium iron phosphate include high-temperature solid-phase reaction method, liquid-pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45B82Y30/00
Inventor 徐建平蒋美娣徐勇
Owner 宜兴奕润新能源科技有限公司
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