Preparation method of coated lithium iron phosphate positive electrode material

A technology of lithium iron phosphate and positive electrode materials, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor processing performance, high cost of inert gas, poor ion and electronic conductivity, etc., and achieve long service life , high initial discharge reversible capacity, improved conductivity and cycle stability

Inactive Publication Date: 2017-09-01
SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the conventional high-temperature solid-phase synthesis method is used to prepare lithium iron phosphate, a large amount of inert protective gas is required, and the cost of the inert gas is relatively high.
[0005] In addition, the ionic and electronic conductivity of lithium iron phosphate is poor. In the prior art, technologies such as

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to the ratio of iron: lithium: carbon stoichiometric ratio 1:1:0.03, weigh lithium carbonate, iron phosphate and starch respectively, add absolute ethanol and mix evenly, perform ball milling at 400rpm for 7h, and then vacuum dry at 80°C for 12h to obtain phosphoric acid Iron-lithium precursor powder; plasma arc is applied to the precursor powder in a reducing atmosphere to melt the reaction powder, the plasma arc voltage is 20kV, and the plasma arc current is 1000A.

[0027] The molten reaction powder is sprayed into the cooling device with reducing gas, the reducing gas is a mixture of nitrogen and hydrogen, wherein the volume percentage of hydrogen in the mixed gas is 1%. After cooling, the particles were pulverized and sieved to obtain a spherical cathode lithium iron phosphate material with a particle size of 5 microns; the diameter of the nozzle used for spraying was 2 mm.

[0028] Add phosphoric acid ester compound in alcoholic solvent to obtain phospho...

Embodiment 2

[0033] Weigh lithium carbonate, iron phosphate and starch according to the ratio of iron: lithium: carbon stoichiometric ratio 1:1:0.05, add anhydrous ethanol and mix evenly, perform ball milling at 500rpm for 9h, and then vacuum dry at 80-90°C for 16h The lithium iron phosphate precursor powder is obtained; the precursor powder is subjected to a plasma arc in a reducing atmosphere to melt the reaction powder, the plasma arc voltage is 40kV, and the plasma arc current is 500A.

[0034] The molten reaction powder is sprayed into the cooling device with reducing gas, the reducing gas is a mixture of nitrogen and hydrogen, wherein the volume percentage of hydrogen in the mixed gas is 3%. After cooling, the particles were pulverized and sieved to obtain a spherical cathode lithium iron phosphate material with a particle size of 10 microns; wherein the diameter of the nozzle used for spraying was 5 mm.

[0035] Add phosphoric acid ester compound in alcoholic solvent to obtain phosp...

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Abstract

The invention relates to a preparation method of a coated lithium iron phosphate positive electrode material. According to the method provided by the invention, the lithium iron phosphate positive electrode material is prepared by adopting a plasma high-temperature melting technology; a complete coating material coats the lithium iron phosphate positive electrode material by adopting a liquid-phase coating method, so that the conductivity is improved. The method provided by the invention is simple and easy to operate, the cost is low, and time consumption is short; the obtained lithium iron phosphate material has a regular shape and is in a highly spherical shape; components of the lithium iron phosphate material are uniform and are not agglomerated, and the lithium iron phosphate material has stable electrochemical performance, relatively good conductivity and circulating performance, relatively high specific capacity and relatively long service life.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a method for preparing a coated lithium iron phosphate cathode material. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries. They have many advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. They are widely used in phones, laptops, and power tools. It also has good application prospects in electric vehicles, and is considered to be an important high-energy technology product in the 21st century. [0003] The current commercial lithium-ion cathode materials are mainly lithium iron phosphate (LiFePO4), ternary materials (nickel-cobalt-manganese ternary material NCM, nickel-cobalt-aluminum ternary material NCA) and lithium manganese oxide (LiMn2O4), among which The cycle life of lithium manganate battery is short and the cycle...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/624H01M10/0525Y02E60/10
Inventor 不公告发明人
Owner SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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