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

A technology of composite materials and oxides, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of capacity attenuation, large volume change, etc., and achieve the effects of small particle size, simple process, and low energy consumption

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

Examples

Experimental program
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Effect test

Embodiment 1

[0035] SnCl with a molar ratio of 1:2 4 ·5H 2 O and CoCl 2 ·6H 2 O was dissolved in deionized water to make 80 mL of Sn 4+ and Co 2+ Total concentration is 0.015mol / L and the solution of 0.015mol / L, add 36 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, and then with 6mol / L NaOH aqueous solution to adjust the pH value to 12, then seal the reactor, react at 200°C for 36 hours, and cool to room temperature naturally; collect the solid reaction product, wash the product alternately with deionized water and absolute ethanol, and dry it. Obtained 0.13g Co 2 SnO 4 / graphene composite material, wherein the weight percentage of graphene is 11%.

[0036] The X-ray diffraction spectrum and transmission electron microscope photograph of the composite material of gained are respectively as follows figure 1 and figure 2 , where the X-ray diffraction pea...

Embodiment 2

[0039] SnCl with a molar ratio of 1:2 4 ·5H 2 O and Ca(CH 3 COO) 2 ·H 2 O dissolved in 1-butanol to make 80 mL of Sn 4+ and Ca 2+ Total concentration is the solution of 0.03mol / L, add 42 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 was adjusted to 9, then the reactor was sealed, reacted at 180°C for 48 hours, and cooled to room temperature naturally; the solid reaction product was collected, washed repeatedly with deionized water and absolute ethanol, and dried to obtain 0.23g Ca 2 SnO 4 / graphene composite material, wherein the weight percentage of graphene is 7.4%.

[0040] It can be seen from the X-ray diffraction pattern and the transmission electron microscope photo of the composite material obtained that the composite material obtained is Ca 2 SnO 4 / graphene composites, where Ca 2 SnO ...

Embodiment 3

[0043] K with a molar ratio of 1:2 2 SnO 3 ·3H 2 O and MgSO 4 ·7H 2 O was dissolved in absolute ethanol to make 80 mL of SnO 3 2- and Mg 2+ Total concentration is 0.09mol / L solution, then add 56 mg GO to prepare mixed solution; The mixed solution is placed in a capacity of 100 ml autoclave (filling degree 80%, volume percentage), with 6mol / L KOH Adjust the pH value of the aqueous solution to 10, then seal the reaction vessel, react at 220°C for 24 hours, and naturally cool to room temperature; collect the solid reaction product, wash the product alternately with deionized water and absolute ethanol, and dry to obtain 0.58 g Mg 2 SnO 4 / graphene composite material, wherein the weight percentage of graphene is 3.8%.

[0044] It can be seen from the X-ray diffraction spectrum and the transmission electron microscope photo of the composite material obtained that the composite material obtained is Mg 2 SnO 4 / graphene composites, where Mg 2 SnO 4 The particle size is i...

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Abstract

The invention discloses a tin-base complex oxide / graphene composite material which is composed of a nano tin-base complex oxide and a graphene, wherein the general formula of the tin-base complex oxide is M2SnO4, and M is Mg, Co, Ca or Zn. Under the dispersion and loading actions of the graphene, the tin-base complex oxide can be distributed uniformly and have small particle size, the stability and loop stability of the tin-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 tin-based complex oxide / graphene composite material and its preparation method and application. 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 of tra...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/48
CPCY02E60/12Y02E60/10
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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