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Zinc-base complex oxide/graphene composite material, and preparation method and application thereof

A technology of composite materials and oxides, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of large volume change and capacity attenuation, and achieve the effects of simple process, improved electrochemical performance, and uniform distribution

Inactive Publication Date: 2012-10-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although this reaction can provide a high capacity, the rapid capacity decay is caused by the large volume change during the lithium-deintercalation process.

Method used

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  • Zinc-base complex oxide/graphene composite material, and preparation method and application thereof
  • Zinc-base complex oxide/graphene composite material, and preparation method and application thereof
  • Zinc-base complex oxide/graphene composite material, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0036] FeCl with a molar ratio of 2:1 3 ·6H 2 O and ZnCl 2 Dissolve in deionized water to make 80 mL of Fe 3+ and Zn 2+ Total concentration is 0.015mol / L solution, add 29 milligrams of GO again and make mixed solution; The mixed solution is placed in the capacity and is in the autoclave (filling degree 80%, volume percentage) of 100 milliliters, then with 6mol / L Adjust the pH value of NaOH aqueous solution to 10, and feed oxygen to saturation, then seal the reactor, react at 220°C for 32 hours, and cool to room temperature naturally; collect the solid reaction product, pass the product through deionized water and absolute ethanol Alternately repeated washing, drying, to obtain 0.107g ZnFe 2 o 4 / graphene composite material, wherein the weight percentage of graphene is 11%.

[0037] The X-ray diffraction spectrum of the composite material of gained, transmission electron micrograph and scanning electron micrograph are respectively as follows figure 1 , figure 2 with i...

Embodiment 2

[0040] MnC with a molar ratio of 2:1 2 o 4 2H 2 O and ZnSO 4 ·7H 2 O was dissolved in ethylene glycol to make 80 mL of Mn 2+ and Zn 2+ Total concentration is the solution of 0.03mol / L, add 38 milligrams of GO again and make mixed solution; The mixed solution is placed in the capacity and is in the autoclave of 100 milliliters (filling degree 80%, percent by volume), adjust pH with 25wt% ammonia water The value is adjusted to 11, and oxygen is passed to saturation (at O 2 Under saturated conditions, Mn 2+ is oxidized to Mn 3+ ), then the reactor was sealed, reacted at 220°C for 36 hours, and cooled naturally to room temperature; the solid reaction product was collected, and the product was washed alternately and repeatedly with deionized water and absolute ethanol, and dried to obtain 0.205g ZnMn 2 o 4 / graphene composite material, wherein the weight percentage of graphene is 7.4%.

[0041] It can be seen from the X-ray diffraction spectrum and transmission electron m...

Embodiment 3

[0044] NiSO with a molar ratio of 2:1 4 ·6H 2 O and ZnC 2 o 4 2H 2 O was dissolved in anhydrous methanol to make 80 mL of Ni 2+ and Zn 2+ A solution with a total concentration of 0.09mol / L was added to prepare a mixed solution with 59 mg of GO; the mixed solution was placed in a high-pressure reactor (filling degree 80%, volume percentage) with a capacity of 100 ml, and the KOH of 6mol / L The pH value of the aqueous solution was adjusted to 9, and oxygen was introduced to saturation (at O 2 Under saturated conditions, Ni 2+ Can be oxidized to Ni 3+ ), then the reactor was sealed, reacted at 240°C for 48 hours, and cooled naturally to room temperature; the solid reaction product was collected, and the product was washed alternately and repeatedly with deionized water and absolute ethanol, and dried to obtain 0.615g ZnNi 2 o 4 / graphene composite material, wherein the weight percentage of graphene is 3.8%.

[0045] It can be seen from the X-ray diffraction spectrum and ...

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Abstract

The invention discloses a zinc-base complex oxide / graphene composite material which is in a laminated structure and is composed of a nano zinc-base complex oxide and graphene, wherein the general formula of the zinc-base complex oxide is ZnM2O4, and M is Mn, Co, Fe or Cr. Under the dispersion and loading actions of the graphene, the zinc-base complex oxide can be distributed uniformly and have small particle size to form a laminated structure, the stability and loop stability of the zinc-base complex oxide in the charging / discharging process can be effectively enhanced, and the composite material can be used as a lithium ion battery negative pole material. The invention also discloses a one-step low-temperature preparation method of the composite material, which has the advantages of simple technique, low cost, short cycle, low energy consumption and the like and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of composite materials for lithium ion batteries, in particular to a zinc-based complex oxide / graphene composite material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, and good safety performance. Therefore, they are widely used in portable electronic products such as digital cameras, mobile phones, and notebook computers. They also have application prospects for electric bicycles and electric vehicles. At present, commercial lithium-ion batteries generally use carbon-based negative electrode materials, such as graphite. Although this material has high stability, its theoretical capacity is only 372mAh·g -1 . [0003] Compared with carbon materials, certain transition metal oxides have higher theoretical capacity, such as Fe 2 o 3 The theoretical capacity is as high as 1000mAh·g -1 . This type...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCY02E60/122Y02E60/10
Inventor 谢健宋文涛刘双宇郑云肖朱铁军曹高劭赵新兵
Owner ZHEJIANG UNIV
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