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Preparation method of battery cathode material with surface coated with composite oxides

A composite oxide and surface coating technology, which is applied in the field of lithium-ion battery materials and materials science, can solve problems such as poor cycle performance and storage performance, restrictions on the application of lithium manganate batteries, and capacity decay during storage to achieve high thermodynamic stability Good reactivity and reducing properties, and improved high temperature stability

Active Publication Date: 2016-07-13
ZHEJIANG WELLY ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although everyone is unanimously optimistic, the storage capacity of lithium manganate batteries decays, resulting in irreversible capacity loss. Under high temperature conditions, the cycle performance and storage performance are worse, which restricts the application of lithium manganate batteries in power batteries and energy storage batteries.

Method used

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  • Preparation method of battery cathode material with surface coated with composite oxides
  • Preparation method of battery cathode material with surface coated with composite oxides
  • Preparation method of battery cathode material with surface coated with composite oxides

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A preparation method of composite oxide surface-coated battery cathode material, comprising the following steps in turn: (1) dissolving 45.39g of aluminum isopropoxide and 47.10g of lanthanum chloride hexahydrate in 3000ml of absolute ethanol, and Add 4ml of acetylacetone, under stirring, quickly add 3000g of the pre-prepared parent material into it, and add 85g of urea, after stirring evenly, the temperature rises to 75°C, and 100 ℃ water vapor, stop after 40min, keep stirring until dry at this temperature, put it in an oven at 100℃ for drying. (2) The dried samples were sintered in an air atmosphere, the sintering temperature was 500° C., and the sintering time was 8 hours. (3) Pulverize and sieve the sintered sample to obtain the composite oxide surface-coated battery positive electrode material.

[0034] Such as figure 1 At room temperature, the battery positive electrode material after coating cycled for 2201 cycles with a capacity retention rate of 80%, while th...

Embodiment 2

[0037] A method for preparing a composite oxide surface-coated positive electrode material for a battery, comprising the following steps in sequence: (1) dissolving 8.90 g of aluminum isopropoxide and 85.32 g of tetrabutyl titanate in 3000 ml of absolute ethanol, and Add 6ml of acetylacetone, and under stirring, quickly add 3000g of the pre-prepared lithium manganate parent material into it, and add 55g of urea. After stirring evenly, the temperature rises to 70°C. From the bottom of the feed liquid at a speed of 5g / min Introduce water vapor at 90°C, stop after 30 minutes, keep stirring until dry at this temperature, and put it in an oven for drying at 100°C. (2) The dried samples were sintered in an air atmosphere, the sintering temperature was 450°C, and the sintering time was 8h. (3) Pulverize and sieve the sintered sample to obtain the positive electrode material of the composite oxide surface-coated lithium manganate battery.

Embodiment 3

[0039] A preparation method for a composite oxide surface-coated battery positive electrode material, comprising the following steps in turn: (1) 31.77g of aluminum isopropoxide and 15.81g of magnesium chloride hexahydrate are dissolved in 2500ml of dehydrated ethanol, and 2.5 ml of acetylacetone, under stirring, quickly add 3000g of the pre-prepared lithium manganate matrix material into it, and add 55g of urea, after stirring evenly, the temperature rises to 80°C, and passes through the bottom of the feed liquid at a speed of 5g / min Inject water vapor at 100°C, stop it after 30 minutes, keep stirring until dry at this temperature, and put it in an oven for drying at 100°C. (2) The dried samples were sintered in an air atmosphere, the sintering temperature was 450°C, and the sintering time was 8h. (3) Pulverize and sieve the sintered sample to obtain the positive electrode material of the composite oxide surface-coated lithium manganate battery.

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Abstract

The invention belongs to the field of lithium ion battery materials and material science, and particularly relates to a preparation method of a battery cathode material with the surface coated with composite oxides. The preparation method comprises the following steps in sequence: (1) dissolving multiple metal sources in an organic solvent, adding an inhibitor into the organic solvent, adding a parent material prepared in advance while stirring, adding urea, uniformly stirring, introducing steam from the bottom of the feed liquid, and stirring at the temperature till dry; (2) sintering a well dried sample in ventilation atmosphere; (3) crushing and sieving the well sintered sample, so as to obtain the battery cathode material with the surface coated with composite oxides. The preparation method has the advantages that the contact between the battery cathode material and the electrolyte and falling-off of the coating layer during the cyclic process are effectively avoided, excessively fast local hydrolysis is prevented, that the coating layer is slowly generated is facilitated, and higher thermodynamic stability, higher oxidative resistance and reducing property, as well as good electrical conductivity are achieved.

Description

technical field [0001] The invention belongs to the field of lithium ion battery material and material science. Background of the invention [0002] With the global energy crisis and ecological crisis, the new energy industry is ushering in rapid development. To develop the new energy industry, it is necessary to vigorously develop high-safety, long-life, high-energy-density power batteries and energy storage batteries. At present, the commercial production of lithium-ion battery cathode materials mainly includes lithium cobaltate, ternary materials, lithium iron phosphate, lithium manganate, etc., and those used for power batteries and energy storage batteries are mainly lithium iron phosphate, lithium manganate, and iron phosphate. Lithium is difficult to control in the production process and has poor consistency, while lithium manganate has high safety performance, abundant resources, low price, easy mass production, and good product consistency. It has become the mainstr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/62H01M10/0525Y02E60/10
Inventor 刘佩何小毛肖伶俐吴奎辰吴清国
Owner ZHEJIANG WELLY ENERGY CORP
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