A kind of porous-hollow composite negative electrode material, preparation method and application thereof

A negative electrode material and hollow technology, which is applied in the field of high-performance porous-hollow composite negative electrode material and its preparation, can solve the problems of poor electrode cycle stability and low electrical conductivity, and achieves cheap preparation of raw materials, high yield, and excellent charge-discharge performance. Effect

Active Publication Date: 2017-04-05
盐城卓越电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these high-capacity negative electrode materials have low conductivity, and under the condition of high-level lithium deintercalation, there is a serious volume effect, resulting in poor cycle stability of the electrode.

Method used

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  • A kind of porous-hollow composite negative electrode material, preparation method and application thereof
  • A kind of porous-hollow composite negative electrode material, preparation method and application thereof
  • A kind of porous-hollow composite negative electrode material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Take 1.0g of Si powder and treat it in a muffle furnace at 600°C for 1h to prepare SiO 2 Layer-coated Si material;

[0033] 2) Take 0.2 g containing SiO 2 The layer-coated Si material was dispersed in an aqueous solution mixed with 100 mL of 28.6 mL of deionized water and 71.4 mL of ethanol, and stirred ultrasonically for 1 h. Add 1.2 g of cetyltrimethylammonium bromide (CTAB), 0.175 g of resorcinol, and 0.1 mL of ammonia water into the above solution, and stir ultrasonically for 30 min. Then put it in an oil bath at 45°C and stir for 30 minutes, add 0.15 mL of formaldehyde solution to the above mixed solution, keep stirring at 45°C for 1 hour, immediately filter with suction, wash with deionized water 3 times, and dry in vacuum at 70°C for 3 hours , preparing a composite material coated with a phenolic resin layer;

[0034] 3) Redisperse 0.1 g of the composite material coated with phenolic resin layer prepared above into 50 mL of deionized water, and ultrasonical...

Embodiment 2

[0039] 1) Take SnO 2 Nanoparticles (50-70 nm) 0.5g, prepared by Stober method containing SiO 2 layer-coated SnO 2 Material;

[0040] 2) Take 0.4 g containing SiO 2 layer-coated SnO 2 Materials The material was dispersed in an aqueous solution of 100 mL of 28.6 mL of deionized water and 71.4 mL of ethanol, and was stirred ultrasonically for 1 h. Add 2.4 g of cetyltrimethylammonium bromide, 0.35 g of resorcinol, and 0.1 mL of ammonia water into the above solution, and stir ultrasonically for 60 min. Then put it in an oil bath at 45°C and stir for 60 minutes, add 0.3 mL of formaldehyde solution to the above mixed solution, keep stirring at 45°C for 1 hour, immediately filter with suction, wash with deionized water 3 times, and dry in vacuum at 70°C for 5 hours. A composite material covered with a phenolic resin layer is prepared;

[0041] 3) Redisperse 0.2 g of the composite material coated with the phenolic resin layer prepared above into 50 mL of deionized water, and disp...

Embodiment 3

[0046] 1) Take 0.5 g of zinc ferrite nanoparticles (50 nm) and prepare SiO-containing 2 Layer-coated zinc ferrite material;

[0047] 2) Take 0.4 g containing SiO 2 The layer-coated zinc ferrite material was dispersed in an aqueous solution mixed with 100 mL of 28.6 mL of deionized water and 71.4 mL of ethanol, and stirred ultrasonically for 1 h. Add 2.4 g of cetyltrimethylammonium bromide (CTAB), 0.35 g of resorcinol, and 0.1 mL of ammonia water into the above solution, and stir ultrasonically for 45 min. Then put it in an oil bath at 45°C and stir for 45 minutes, add 0.3 mL of formaldehyde solution to the above mixed solution, keep stirring at 45°C for 1 hour, immediately filter with suction, wash with deionized water 3 times, and dry in vacuum at 70°C for 3 hours , preparing a composite material coated with a phenolic resin layer;

[0048] 3) Re-disperse 0.2 g of the prepared composite material coated with phenolic resin layer into 50 mL of deionized water, and disperse i...

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Abstract

The invention discloses a preparation method of a high-performance porous-hollow composite anode material. An SiO<2> layer is introduced into the surface of a high-capacity nano anode material as a sacrificial layer; a uniform carbon layer is introduced through in situ polymerization of phenolic resin; a high-molecular polymer and a soft template are subjected to cross-linking polymerization on the surface; and the high-performance porous-hollow composite anode material is prepared through high-temperature carbonization and template removal methods. The invention further discloses the high-performance porous-hollow composite anode material and an application thereof. According to the characteristics of a lithium battery anode material in charge and discharge cycles, the uniform carbon layer coats the outside of an intermediate layer of an active material, and a uniform mesoporous structure is designed in the middle of the outer carbon layer, so that the electrochemical properties of the electrode material are effectively improved. The high-performance porous-hollow composite anode material is cheap in preparing raw materials, simple in operation process and high in yield; the charge and discharge properties of the material are excellent; and industrial production is facilitated.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a high-performance porous-hollow composite negative electrode material and its preparation method and application. 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, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/48H01M4/5825H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 岳鹿张文惠徐亚楠王晖
Owner 盐城卓越电子材料有限公司
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