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A kind of graphene-metal oxide composite negative electrode material and preparation method thereof

A negative electrode material and oxide technology, which is applied in the field of graphene-metal oxide composite negative electrode materials and its preparation, can solve rare and other problems, and achieve the effects of increasing oxygen vacancies, improving electrical conductivity, and obvious electrical conductivity

Active Publication Date: 2017-07-11
中炬高新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Until now, similarly via CaH 2 Treatment studies are relatively rare

Method used

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  • A kind of graphene-metal oxide composite negative electrode material and preparation method thereof
  • A kind of graphene-metal oxide composite negative electrode material and preparation method thereof
  • A kind of graphene-metal oxide composite negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) Prepare two 200mL aqueous solutions containing 1wt.% PDDA and 0.2M NaCl, and disperse them uniformly by ultrasonic dispersion for 10 minutes; Zinc ferrite (with a particle size of 100nm) was sequentially modified by PDDA-PSS-PDDA, filtered, and vacuum-dried at 70°C for 2h. Grind after drying, mark and store;

[0041] (2) Take 0.1 g of the above-mentioned modified zinc ferrite powder and redisperse it in 50 mL of deionized water, and disperse it by ultrasonic for 2 hours to make it uniformly dispersed;

[0042](3) 1 g of graphene oxide was added to 1000 mL of deionized water, ultrasonically dispersed for 5 hours to make it evenly peeled off, and then the insoluble matter was removed by centrifugation to obtain a transparent graphene oxide aqueous solution with a concentration of about 0.2 mg / mL.

[0043] (4) Under the situation of high-speed stirring, get above-mentioned zinc ferrite solution and pour in the graphene aqueous solution of 100mL, continue to stir for 2...

Embodiment 2

[0048] (1) Prepare two 200mL aqueous solutions containing 1wt.% PDDA and 0.2M NaCl, and disperse them uniformly by ultrasonic dispersion for 10 minutes; SnO 2 (particle size is 100-200nm), modified by PDDA-PSS-PDDA treatment sequentially, filtered, and vacuum-dried at 70°C for 2h. Grind after drying, mark and store;

[0049] (2) Take the above modified SnO 2 Powder 0.1g re-dispersed in 50mL deionized water, ultrasonically dispersed for 2 hours to make it evenly dispersed;

[0050] (3) 1 g of graphene oxide was added to 1000 mL of deionized water, ultrasonically dispersed for 5 hours to make it evenly peeled off, and then the insoluble matter was removed by centrifugation to obtain a transparent graphene oxide aqueous solution with a concentration of about 0.2 mg / mL.

[0051] (4) In the case of high-speed stirring, take the above SnO 2 The solution was poured into 50mL of graphene aqueous solution, and left to stand after stirring for 2 hours, vacuum-dried after filtration;...

Embodiment 3

[0056] (1) Prepare two 200mL aqueous solutions containing 1wt.% PDDA and 0.2M NaCl, and disperse them uniformly by ultrasonic dispersion for 10 minutes; Fe 2 o 3 (particle size is 50-70nm), modified by PDDA-PSS-PDDA sequentially, filtered, and vacuum-dried at 70°C for 2h. Grind after drying, mark and store;

[0057] (2) Take the above-mentioned modified Fe 2 o 3 Powder 0.1g re-dispersed in 50mL deionized water, ultrasonically dispersed for 2 hours to make it evenly dispersed;

[0058] (3) 0.1 g of graphene oxide (single layer) was added into 100 mL of deionized water, and ultrasonically dispersed for 5 hours to obtain a transparent graphene oxide aqueous solution.

[0059] (4) In the case of high-speed stirring, take the above-mentioned Fe 2 o 3 The solution is poured into the above-mentioned graphene aqueous solution, and the stirring is continued for 2 hours, then left to stand, filtered and dried in vacuum;

[0060] (5) The dried powder and 0.2g of CaH 2 Mix and gr...

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Abstract

The invention discloses a graphene-metal oxide composite negative electrode material and a preparation method therefor. The composite negative electrode material is mainly prepared from graphene and metal oxides. Graphene is employed as a three-dimensional network skeleton, metal oxides modified through layer-layer self assembly are employed as active substances, and a composite negative electrode material with oxygen deficiency is prepared. Compared with the prior art, the material can be prepared in conditions that the time is 3-10h and the temperature is 350-450 DEG C. The conductivity of the active substances is improved obviously, oxygen vacancy of the metal oxides can be increased greatly, and therefore the cycle performance of the composite material is improved greatly. In addition, the technology is simple, the repeatability is good, the cost is low, and the composite negative electrode material has a good large-scale application potential.

Description

technical field [0001] The invention relates to a graphene-metal oxide composite negative electrode material and a preparation method thereof, belonging to the technical field of lithium ion battery negative electrode materials. Background technique [0002] 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. The most ideal power supply for 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 and hybrid electric vehicles. capacity requirements. Therefore, it is extremely urgent to develop new anode materials for lithium-ion batteries with high specific cap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/48H01M4/625H01M10/0525Y02E60/10
Inventor 岳鹿张文惠范佳佳张文超
Owner 中炬高新材料股份有限公司
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