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A kind of preparation method of coated lithium manganese oxide composite cathode material

A composite positive electrode material and coated lithium manganate technology, which is applied to battery electrodes, batteries, and structural parts, can solve the problems of reducing the tap density of lithium manganate, increasing battery volume, and affecting the chemical activity of lithium manganate. Improve the conductivity and cycle stability, improve the activity and stability of the material, and the effect of high first-time discharge reversible capacity

Active Publication Date: 2019-08-09
唐山鑫丰锂业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, currently commercialized LiMnO 2 During preparation, the trimanganese tetraoxide used is mainly prepared by calcining manganese oxalate and manganese carbonate, but because the synthesized manganese oxalate and manganese carbonate are irregular particles, after firing, the obtained trimanganese tetraoxide is also free. The shape will reduce the tap density and increase the volume of the battery when the lithium manganate is synthesized, and the calcination will reduce the chemical activity of trimanganese tetraoxide, which will eventually affect the electrochemical activity of lithium manganate, resulting in its cycle performance that cannot meet market demand.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of LiMn 0.78 Al 0.2 Ti 0.02 o 2 . According to the molar weights of Li, Mn, Al and Ti in the above chemical formula, weigh lithium carbonate with a purity greater than 99%, trimanganese tetraoxide with a purity greater than 99%, alumina with a purity greater than 99%, and titanium oxide with a purity greater than 99%. , the above lithium carbonate, manganese tetraoxide, alumina and titanium oxide were mechanically mixed and melted at a temperature of 1450 ° C, cooled, ball milled into powder, and sintered at 850 ° C for 5 hours to obtain a lithium manganate composite material.

[0023] 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 alcohol ...

Embodiment 2

[0028] Preparation of LiMn 0.72 Al 0.25 Ti 0.03 o 2 . According to the molar weights of Li, Mn, Al and Ti in the above chemical formula, weigh lithium carbonate with a purity greater than 99%, trimanganese tetraoxide with a purity greater than 99%, alumina with a purity greater than 99%, and titanium oxide with a purity greater than 99%. , the above lithium carbonate, manganese tetraoxide, alumina and titanium oxide were mechanically mixed and melted at a temperature of 1450°C. After cooling, ball milled into powder and sintered at 900°C for 5 hours to obtain a lithium manganate composite material.

[0029] 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 isopro...

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Abstract

The invention relates to a preparation method for a coating type lithium manganate composite positive electrode material. The preparation method comprises the following steps of (1) preparing a lithium manganate composite material, wherein the chemical formula of the lithium manganate composite material is LiMn<1-x-y>Al<x>TiyO<2>; x is 0.2-0.25, and y is 0.02-0.03; (2) preparing a positive electrode active material coating liquid; and (3) coating. The positive electrode material prepared by the method is relatively high in conductivity, cycling performance and specific capacity, and relatively long in service life.

Description

[0001] Technical field [0002] The invention relates to the technical field of lithium batteries, in particular to a preparation method of a coated lithium manganese oxide composite positive electrode 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 cat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58
CPCH01M4/364H01M4/5805H01M2220/20Y02E60/10
Inventor 杨仲英
Owner 唐山鑫丰锂业有限公司