Graphene-metal oxide composite negative electrode material and preparation method therefor

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 problems, achieve the effects of increasing oxygen vacancies, improving cycle performance, and good potential for large-scale application

Active Publication Date: 2016-02-24
中炬高新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Until now, similarly via CaH 2 Tr

Method used

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  • Graphene-metal oxide composite negative electrode material and preparation method therefor
  • Graphene-metal oxide composite negative electrode material and preparation method therefor
  • Graphene-metal oxide composite negative electrode material and preparation method therefor

Examples

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Example Embodiment

[0039] Example 1

[0040] (1) Prepare two 200mL portions of an aqueous solution containing 1wt.% PDDA and 0.2M NaCl, ultrasonically disperse for 10 minutes to make them uniformly dispersed; prepare 200mL one portion of 1wt.% PSS aqueous solution, and ultrasonically disperse for 10 minutes to make them uniformly dispersed; 1g The zinc ferrite (with a particle size of 100nm) was sequentially modified by PDDA-PSS-PDDA treatment, filtered, and vacuum dried at 70°C for 2h. Grind after drying, mark and store;

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

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

[0043] (4) Under the ...

Example Embodiment

[0047] Example 2

[0048] (1) Prepare two 200mL portions of an aqueous solution containing 1wt.% PDDA and 0.2M NaCl, ultrasonically disperse for 10 minutes to make them uniformly dispersed; prepare 200mL one portion of 1wt.% PSS aqueous solution, and ultrasonically disperse for 10 minutes to make them uniformly dispersed; 1g SnO 2 (The particle size is 100-200nm), followed by PDDA-PSS-PDDA treatment modification, filtration, and vacuum drying at 70°C for 2h. Grind after drying, mark and store;

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

[0050] (3) Add 1 g of graphene oxide to 1000 mL of deionized water, disperse it ultrasonically for 5 hours to make it evenly peeled off, and then remove insoluble matter 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 stir...

Example Embodiment

[0055] Example 3

[0056] (1) Prepare two 200mL portions of an aqueous solution containing 1wt.% PDDA and 0.2M NaCl, ultrasonically disperse for 10 minutes to make them uniformly dispersed; prepare 200mL one portion of 1wt.% PSS aqueous solution, and ultrasonically disperse for 10 minutes to make them uniformly dispersed; 1g Fe 2 O 3 (The particle size is 50-70nm), sequentially modified by PDDA-PSS-PDDA treatment, filtered, and vacuum dried at 70°C for 2h. Grind after drying, mark and store;

[0057] (2) Take the above modified Fe 2 O 3 0.1g powder is re-dispersed in 50mL deionized water, and ultrasonically dispersed for 2 hours to make it uniformly dispersed;

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

[0059] (4) In the case of high-speed stirring, take the above Fe 2 O 3 Pour the solution into the above-mentioned graphene aqueous solution, c...

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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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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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