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Transition metal tin compound/graphene composite material and preparation method and application thereof

A technology of transition metals and composite materials, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of poor electrochemical stability of tin-based alloy materials, high raw material requirements, and increased production costs, so as to improve electrochemical stability, The effect of high purity and low cost

Inactive Publication Date: 2012-11-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, these tin-based alloys are generally prepared by solid-state sintering method, which is expensive in equipment, complicated in process, and requires high raw materials, which greatly increases the preparation cost.
In addition, due to the large volume change of the tin-based alloy during charging and discharging, and the large particle size and uneven distribution of the material prepared by the solid-state method, the electrochemical stability of the obtained tin-based alloy material is poor.

Method used

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  • Transition metal tin compound/graphene composite material and preparation method and application thereof
  • Transition metal tin compound/graphene composite material and preparation method and application thereof
  • Transition metal tin compound/graphene composite material and preparation method and application thereof

Examples

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Embodiment 1

[0034] 1) Dissolve 106 mg of GO in an appropriate amount of ethylene glycol and sonicate until completely dispersed to obtain a homogeneous solution of GO.

[0035] 2) The analytically pure SnCl 2 2H 2 O and FeCl 3 ·6H 2 O, according to the ratio of Fe:Sn atomic ratio 1:2, dissolved in ethylene glycol to obtain FeSn 2 Concentration is 80 milliliters of the solution of 0.015mol / L, this solution is added in the homogeneous solution of GO of step 1), after stirring evenly, make mixed solution.

[0036] 3) The mixed solution of step 2) is placed in a high-pressure reactor with a capacity of 100 milliliters (filling degree 80%, percent by volume), and 2.3 grams of reducing agent NaBH are added in the solution 4 , then seal immediately.

[0037] 4) Heating the reactor to 230°C and reacting for 32 hours.

[0038] 5) After the reaction, cool down to room temperature naturally, collect the powdery reaction product at the bottom of the kettle, wash it with deionized water and absolu...

Embodiment 2

[0042] 1) Dissolve 142 mg of GO in an appropriate amount of deionized water, and sonicate until completely dispersed to obtain a homogeneous solution of GO.

[0043] 2) The analytically pure SnCl 4 ·5H 2 O and CoCl 2 ·6H 2 O, NiSO 4 ·7H 2 O, according to the ratio of Co: Ni: Sn atomic ratio 0.9: 0.1: 2, dissolved in deionized water to obtain Co 0.9 Ni 0.1 sn 2 The concentration is 80 milliliters of the solution of 0.03mol / L, this solution is added in step 1) in the homogeneous solution of GO, after stirring evenly, make mixed solution.

[0044] 3) Place the mixed solution of step 2) in a high-pressure reactor with a capacity of 100 ml (filling degree 80%, volume percentage), and add 4.5 grams of reducing agent KBH4 to the solution, and then seal it immediately.

[0045] 4) Heating the reactor to 230°C and reacting for 36 hours.

[0046] 5) After the reaction, cool down to room temperature naturally, collect the powdery reaction product at the bottom of the kettle, was...

Embodiment 3

[0050] 1) Dissolve 300 mg of graphene oxide (GO) in an appropriate amount of ethylene glycol and sonicate until completely dispersed to obtain a homogeneous solution of GO.

[0051] 2) The analytically pure SnCl 2 2H 2 O and NiCl 2 ·6H 2 O, according to the ratio of Ni:Sn atomic ratio 3:2, dissolved in ethylene glycol to obtain Ni 3 sn 2 Concentration is 80 milliliters of the solution of 0.09mol / L, this solution is added in the homogeneous solution of GO of step 1), after stirring evenly, make mixed solution.

[0052] 3) The mixed solution of step 2) is placed in a high-pressure reactor with a capacity of 100 milliliters (filling degree 80%, percent by volume), and 5.4 grams of reducing agent NaBH are added in the solution 4 , then seal immediately.

[0053] 4) Heating the reactor to 240°C and reacting for 28 hours.

[0054] 5) After the reaction, cool down to room temperature naturally, collect the powdery reaction product at the bottom of the kettle, wash it with deio...

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Abstract

The invention discloses a transition metal tin compound / graphene composite material which consists of a nano-scale transition metal tin compound and grapheme, wherein a general formula of the transition metal tin compound is MSn2 or M3Sn2, M represents VIII transition metal elements. As the dispersion and loading effects of the grapheme can be uniformly distributed, the stability of the transition metal tin compound in the composite material in the process of charging and discharging can be effectively improved, and the transition metal tin compound / graphene composite material can be used as a cathode material of a lithium ion battery. The invention also discloses a preparation method of the composite material through a one-step hydrothermal method or a one-step solvent thermal method which has the advantages of simple process, low cost, short cycle, low energy consumption and the like.

Description

technical field [0001] The invention relates to the field of composite materials for lithium ion batteries, in particular to a transition metal tin 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. The anode materials of current commercial lithium-ion batteries are graphite and other forms of carbon materials. Since the theoretical capacity of graphite is only 372mAh g -1 , and the lithium intercalation potential is low, which limits its application range. Compared with carbon materials such as graphite, some tin-based alloys have more ideal lithium intercalation potential and higher mass ...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62B22F9/24
CPCY02E60/12Y02E60/10
Inventor 谢健冯斌郑云肖刘双宇宋文涛曹高劭朱铁军赵新兵
Owner ZHEJIANG UNIV
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