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A kind of preparation method of lithium iron phosphate cathode material

A lithium iron phosphate and cathode material technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of complex doping modification process, poor processing performance, etc., to improve electrical conductivity and cycle stability, long-term performance. Longevity, effect of high first-discharge reversible capacity

Active Publication Date: 2019-07-26
ZAOZHUANG HAIDI ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, nanonization makes the processing performance of the material worse, and the doping modification process is more complicated, which needs to be improved and developed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh lithium carbonate, ammonium dihydrogen phosphate, and ferrous oxalate respectively according to the stoichiometric ratio of 1:1:1, add absolute ethanol and mix evenly, perform ball milling at 400rpm for 6h, and then vacuum dry at 70°C for 10h to obtain ferric phosphate Lithium precursor powder.

[0023] The prepared lithium iron phosphate precursor was kept at 380° C. for 4 hours in a tube furnace protected by a pure nitrogen atmosphere, continued to heat up to 650° C. for calcination for 6 hours, and then naturally cooled to room temperature to obtain a lithium iron phosphate cathode material.

[0024] Add phosphoric acid ester compound in alcoholic solvent to obtain phosphoric acid ester solution. Preferably, the alcohol solvent is one or more composite solvents of methanol, ethanol, propanol, n-butanol and isopropanol, and the general formula of the phosphoric acid ester compound can be A n P(O)(OH) m , wherein A is a carbon-oxygen group corresponding to the ...

Embodiment 2

[0029] Weigh lithium carbonate, ammonium dihydrogen phosphate, and ferrous oxalate according to the stoichiometric ratio of 1:1:1, add absolute ethanol and mix evenly, then perform ball milling at 500rpm for 10h, and then vacuum dry at 90°C for 20h to obtain ferric phosphate Lithium precursor powder.

[0030] The prepared lithium iron phosphate precursor was kept at 420° C. for 6 hours in a tube furnace protected by a pure nitrogen atmosphere, continued to heat up to 750° C. for calcination for 10 hours, and then naturally cooled to room temperature to obtain a lithium iron phosphate cathode material.

[0031] Add phosphoric acid ester compound in alcoholic solvent to obtain phosphoric acid ester solution. The alcoholic solvent is isopropanol, and the general formula of the phosphoric acid ester compound can be A n P(O)(OH) m , wherein A is a carbon-oxygen group corresponding to the alcohol solvent molecule, namely at least one of methoxy, ethoxy, propoxy, butoxy and isoprop...

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Abstract

The invention relates a preparation method for a lithium iron phosphate positive electrode material. The method comprises the following steps of (1) preparing a lithium iron phosphate material; (2) preparing a cladding solution of a positive active material; and (3) cladding the positive active material. The positive electrode material prepared according to the method has relatively high conductivity and cycle performance, and has relatively high specific capacity and relatively long service lifetime.

Description

[0001] Technical field [0002] The invention relates to the technical field of lithium batteries, in particular to a method for preparing a lithium iron phosphate cathode material. Background technique [0003] The rapid development of the automobile industry has promoted the progress and development of global machinery, energy, transportation and other industries. However, while fuel vehicles benefit mankind, their exhaust emissions have also caused serious pollution to the human living environment. The requirements of environmental protection and energy shortage have driven the development of electric vehicles (EV) and power batteries. At present, the main problems of electric vehicles are price, mileage, power performance, etc., and these problems are closely related to battery technology. The research and development of battery technology and battery materials will play a decisive role in its development. Energy, cheap, safe and reliable cathode materials are of great si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/624H01M10/0525Y02E60/10
Inventor 杨仲英
Owner ZAOZHUANG HAIDI ENERGY TECH