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Nitrogen-doped porous composite negative electrode material and preparation method therefor

A negative electrode material, nitrogen element technology, applied in the direction of electrical components, battery electrodes, structural parts, etc., can solve the problems of unsatisfactory electrical conductivity and electrical cycle performance, limited active material volume suppression, unfavorable mass transfer, etc., to improve electrical conductivity And electrode cycle performance, cycle performance improvement, good repeatability effect

Active Publication Date: 2016-03-23
合肥龙智机电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above-mentioned technologies can improve the electrical conductivity of the negative electrode material to a certain extent, there are still some problems, such as the lack of a suitable pore structure in the composite material is not conducive to mass transfer, and the volume suppression of the active material is limited, and the electrical conductivity and electrical cycle performance are still low. not ideal

Method used

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  • Nitrogen-doped porous composite negative electrode material and preparation method therefor
  • Nitrogen-doped porous composite negative electrode material and preparation method therefor
  • Nitrogen-doped porous composite negative electrode material and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Add 0.5 g of triblock polymer Pluronic F127 into 100 mL of deionized water, ultrasonically disperse for 1 h, add 0.5 g of oxidized Si particles with a size of 100-150 nm, and ultrasonically disperse for 1 h until a uniform dispersion is obtained;

[0046] (2) Stir the above mixed solution under ice bath for 30 minutes, add 1.0 g of p-phenylenediamine, and ultrasonically disperse for 30 minutes;

[0047] (3) Add 10mL of concentrated hydrochloric acid to the above mixture, stir for 30min, then dropwise add 20mL of 1M / L sodium nitrite solution within 20 minutes, stir for 0.5h under ice bath, and obtain monodisperse active substance / polymer by suction filtration Composite material, after washing three times, dried;

[0048] (4) Add 0.1 g of the monodisperse active substance / polymer composite material after suction filtration to 50 mL of deionized water again, ultrasonically disperse for 1 hour, and stir evenly;

[0049] (5) Disperse 0.3g chitosan in an aqueous solution...

Embodiment 2

[0054] (1) Add 0.5g triblock polymer PluronicF127 to 100mL deionized water, ultrasonically disperse for 1h, add SnO 2 Ultrasonic dispersion of 1g of nanoparticles (50-70nm) for 1h until a uniform dispersion liquid;

[0055] (2) Stir the above mixed solution for 30 minutes in an ice bath, add 0.5 g of p-phenylenediamine, and ultrasonically disperse for 30 minutes;

[0056] (3) Add 10mL of concentrated hydrochloric acid to the above mixture, stir for 30min, then dropwise add 7.5mL of 1M / L sodium nitrite solution within 20 minutes, stir for 24h under ice bath, and obtain monodisperse active substance / polymer by suction filtration Composite material, after washing three times, dried;

[0057] (4) Add 0.15 g of the monodisperse active substance / polymer composite material after suction filtration to 50 mL of deionized water again, ultrasonically disperse for 1 hour, and stir evenly;

[0058] (5) Disperse 0.2g chitosan in an aqueous solution containing 1% acetic acid (volume ratio)...

Embodiment 3

[0063] (1) Add the triblock polymer PluronicF127 into 100mL of deionized water, ultrasonically disperse for 1h, add 0.5g of zinc ferrite (50nm spherical particles) and ultrasonically disperse for 1h to form a uniform dispersion;

[0064] (2) Stir the above mixed solution for 30 minutes in an ice bath, add 1.5 g of p-phenylenediamine, and ultrasonically disperse for 30 minutes;

[0065] (3) Add 10mL of concentrated hydrochloric acid to the above mixture, stir for 30min, then dropwise add 32.6mL of 1M / L sodium nitrite solution within 20 minutes, stir for 0.5h under ice bath, and obtain monodisperse active substance / polymerization by suction filtration The composite material was washed three times and then dried;

[0066] (4) Add 0.18 g of the monodisperse active substance / polymer composite material after suction filtration to 50 mL of deionized water again, ultrasonically disperse for 1 hour, and stir evenly;

[0067] (5) Disperse 0.2g chitosan in an aqueous solution containing...

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Abstract

The invention discloses a nitrogen-doped porous composite negative electrode material and a preparation method therefor. The composite negative electrode material comprises an active substance as a core, a core-shell structure applied to the outer surface of the active substance, and a porous carbon structure applied to the outer surface of the core-shell structure, wherein the core-shell structure is a mesoporous carbon structure formed by nitrogen-doped carbon; and the porous carbon structure is a uniform porous carbon structure coated with nitrogen-doped three-dimensional porous carbon. Compared with the prior art, the composite negative electrode material can better control the volume effect of the active substance, is remarkably improved in conductive performance and electrode cycle performance, is high in repeatability and low in cost, and has relatively high potential of large-scale application.

Description

technical field [0001] The invention relates to a nitrogen-doped porous composite negative electrode material and a preparation method thereof, belonging to the technical field of lithium ion battery negative electrode materials. Background technique [0002] Lithium-ion batteries have the advantages of high open-circuit voltage, high energy density, long service life, no memory effect, less pollution, and low self-discharge rate. Its overall performance is superior to other traditional secondary batteries, and it is unanimously considered as a variety of portable batteries. The most ideal power supply for electronic equipment and electric vehicles. Although graphite, the negative electrode material of traditional lithium-ion batteries, has good cycle stability and high cost performance, due to its low charge-discharge specific capacity and no advantage in volume specific capacity, it is difficult to meet the high requirements of power systems, especially electric vehicles a...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/48H01M4/5825H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 岳鹿张文惠徐亚楠曹蓉
Owner 合肥龙智机电科技有限公司
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