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Three-layer nuclear-shell lithium-ion battery positive composite material and preparation method thereof

A technology for ion batteries and composite materials, which is applied in the field of three-layer core-shell lithium ion battery cathode composite materials and its preparation, achieving the effects of high safety, good electrochemical performance, and wide sources

Inactive Publication Date: 2013-09-18
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide a three-layer core-shell lithium ion battery positive electrode composite material and its preparation method, to solve the electrical conductivity and lithium ion mobility of the above materials and high temperature stability and cycle stability. The problem of stability, meanwhile, technique of the present invention is simple and easy, is suitable for industrialized production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Mix and dissolve 3.7g of lithium carbonate, 18g of ferrous nitrate and 11.5g of ammonium dihydrogen phosphate in 100mL of water, add the corresponding amount of 16.6g of sodium gluconate and 3.32g of acetylene black, mix the above-mentioned substances evenly, ultrasonically disperse them for 30 minutes, and put them into water In a hot kettle, under the condition of being filled with inert gas, react at 200°C for 24 hours;

[0037] After the reaction, the above product was washed several times with deionized water and absolute ethanol, and then placed in a vacuum drying oven at 80°C for 10 hours to obtain a spherical precursor;

[0038] Under the protection of nitrogen, add the spherical precursor to 100mL alcohol-water solution, keep the final volume ratio of alcohol and water at 10:1, stir with a mixer for 60 minutes, add ammonia water to control the pH of the solution to 9, then add 86gTEOS, and react at room temperature 8 hours.

[0039] After the prepared suspensi...

Embodiment 2

[0042] Mix and dissolve 3.6g of lithium carbonate, 17.1g of ferrous nitrate and 11.5g of ammonium dihydrogen phosphate in 100mL of water, add 25g of mixed template directing agent (10g of polyvinyl alcohol and 15g of polyethylene glycol) and 5g of carbon black, and mix the above substances evenly , after ultrasonic dispersion for 30 minutes, put it into a hydrothermal kettle, and react at 200°C for 24 hours under the condition of being filled with inert gas;

[0043] After the reaction, the above product was washed several times with deionized water and absolute ethanol, and then placed in a vacuum drying oven at 100°C for 10 hours to obtain a spherical precursor;

[0044]Under the protection of nitrogen, add the spherical precursor to 100mL alcohol-water solution, keep the final volume ratio of alcohol and water at 10:1, stir with a mixer for 60 minutes, add an appropriate amount of ammonia water to control the pH of the solution in the range of 8-9, and then add 67g TEOS, re...

Embodiment 3

[0048] Mix and dissolve 1.94g of lithium carbonate, 9.45g of ferrous nitrate and 5.75g of ammonium dihydrogen phosphate in 100mL of water, then add 10g of cetyltrimethylammonium bromide and 2g of carbon black. Put it into a hydrothermal kettle, and react at 200°C for 24 hours under the condition of being filled with inert gas;

[0049] After the reaction, the above product was washed several times with deionized water and absolute ethanol, and then placed in a vacuum drying oven at 100°C for 10 hours to obtain a spherical precursor;

[0050] Under the protection of nitrogen, add the spherical precursor to 100mL alcohol-water solution, keep the final volume ratio of alcohol and water at 10:1, stir with a mixer for 60 minutes, add an appropriate amount of ammonia water to control the pH of the solution in the range of 8-9, and then add 67g TEOS, reacted at room temperature for 8 hours;

[0051] After the prepared suspension was filtered, it was spray-dried and placed in a vacuu...

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Abstract

The invention relates to a three-layer nuclear-shell lithium-ion battery positive composite material which comprises a spherical lithium iron phosphate inner layer, a carbon layer which wraps the lithium iron phosphate inner layer, and a silicon dioxide layer which wraps the carbon layer. The preparation method of the composite material comprises the following steps of: mixing and dissolving a lithium compound, a ferrous compound and a phosphorous compound for mixing with a template guiding agent and a carbon source, the mixture, and placing the mixture after ultrasonic dispersing into a water heating kettle for reaction under inert gas; washing reactants respectively through deionized water and absolute ethyl alcohol, and drying the reactants to obtain a spherical precursor; adding the spherical precursor under the protection of nitrogen into an alcohol aqueous solution, and then adding TEOS (tetraethyl orthosilicate) for reaction to obtain turbid liquid; filtering the turbid liquid, and drying in a spraying manner to obtain the composite material. In the synthesis process of the material, the template guiding agent is adopted, so that the three-layer nuclear-shell lithium-ion battery positive composite material with a uniform spherical shape, high compactness density and an excellent electrochemical performance can be obtained.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a three-layer core-shell lithium ion battery cathode composite material and a preparation method thereof. Background technique [0002] Since the 1990s, the research and application of lithium-ion batteries have developed rapidly. Due to its advantages of high working voltage, high capacity, good cycle performance and good safety, its application fields are becoming more and more extensive. [0003] In 1997, Goodenough et al reported a new type of olivine structure material LiFePO 4 It is used as cathode material for lithium-ion batteries. It has many characteristics such as high theoretical capacity, good cycle performance, abundant raw material sources, low cost, excellent safety performance and environmental friendliness. It is considered to be the most potential secondary battery at present and will be widely used Used in pure electric vehicles and hybrid ele...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/10
Inventor 王娟许云华任冰王亮亮燕映霖钟黎声叶芳霞强静李雯
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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