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Transitional metal 2-antimonide/grapheme composite material and preparation method and application thereof

A technology of transition metals and composite materials, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of poor electrochemical stability of antimony-based alloy materials, large volume changes of antimony-based alloys, and increased preparation costs, etc., to achieve improved electrochemical performance. Stability, low cost, evenly distributed effect

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

At present, these antimony-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 antimony-based alloys 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 antimony-based alloy materials is poor.

Method used

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  • Transitional metal 2-antimonide/grapheme composite material and preparation method and application thereof
  • Transitional metal 2-antimonide/grapheme composite material and preparation method and application thereof
  • Transitional metal 2-antimonide/grapheme composite material and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0033] 1) The analytically pure SbCl 3 and FeSO 4 ·7H 2O, according to the proportion of Fe:Sb atomic ratio 1:2, mixed in diethylene glycol to obtain FeSb 2 The meter concentration is the mixed solution of 0.2mol / L, and the mixed solution volume is 80 milliliters.

[0034] 2) After adding 1.4 grams of GO to the mixed solution in step 1), place it in a high-pressure reactor with a capacity of 100 ml (filling degree 80%, volume percentage), and add 19.2 grams of reducing agent NaBH to the solution 4 , then seal immediately.

[0035] 3) Heating the reactor to 180°C and reacting for 28 hours.

[0036] 4) Naturally cool to room temperature after the reaction, collect the powdery reaction product at the bottom of the kettle, wash it with deionized water and absolute ethanol alternately and repeatedly for several times, then vacuum dry the powder at 110°C for 12 hours to obtain a composite material powder , the weight percentage of graphene in the composite material is 12%.

[...

Embodiment 2

[0040] 1) Analytical pure Sb(NO 3 ) 3 and CoCl 2 ·6H 2 O, NiSO 4 ·7H 2 O, according to the ratio of Co: Ni: Sb atomic ratio 0.9: 0.1: 2, mixed in deionized water to obtain Co 0.9 Ni 0.1 Sb 2 The meter concentration is the mixed solution of 0.05mol / L, and the mixed solution volume is 80 milliliters.

[0041] 2) After adding 120 mg of GO to the mixed solution in step 1), place it in a high-pressure reactor with a capacity of 100 ml (filling degree 80%, volume percentage), and add 4.1 g of reducing agent KBH to the solution 4 , then seal immediately.

[0042] 3) Heating the reactor to 160°C and reacting for 40 hours.

[0043] 4) Naturally cool to room temperature after the reaction, collect the powdery reaction product at the bottom of the kettle, wash it with deionized water and absolute ethanol alternately and repeatedly for several times, then vacuum dry the powder at 110°C for 12 hours to obtain a composite material powder , the weight percent of graphene in the com...

Embodiment 3

[0047] 1) The analytically pure SbCl 3 , NiSO 4 ·7H 2 O and FeSO 4 ·7H 2 O is mixed in anhydrous glycerol after being dosed according to the ratio of Ni:Fe:Sb atomic ratio 0.5:0.5:2 to obtain Ni 0.5 Fe 0.5 Sb 2 The meter concentration is the mixed solution of 0.15mol / L, and the mixed solution volume is 80 milliliters.

[0048] 2) After adding 180 mg of GO to the mixed solution in step 1), place it in a high-pressure reactor with a capacity of 100 ml (filling degree 80%, volume percentage), and add 7.8 grams of reducing agent NaBH to the solution 4 , then seal immediately.

[0049] 3) Heating the reactor to 200°C and reacting for 36 hours.

[0050] 4) Naturally cool to room temperature after the reaction, collect the powdery reaction product at the bottom of the kettle, wash it with deionized water and absolute ethanol alternately and repeatedly for several times, then vacuum dry the powder at 110°C for 12 hours to obtain a composite material powder , the weight percen...

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Abstract

The invention discloses a transitional metal 2-antimonide / grapheme composite material consisting of a nano transitional metal 2-antimonide and graphene, the general formula of the transitional metal 2-antimonide is MxSb2, M represents one of VIII transitional metal elements, and x is larger than or equal to 0.95 and smaller than and equal to 1.05. The transitional metal 2-antimonide can be uniformly distributed due to dispersing and bearing functions of the graphene, so that the stability of the transitional metal 2-antimonide is effectively improved in the charge and discharge processed, and the composite material can be used as an anode material of a lithium ion battery. The invention also discloses a preparation method for the composite material by adopting a one-step hydrothermal method or a one-step solvothermal method, and the preparation method has the advantages of simple process, low cost, short period, 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 antimonide / 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 antimony-based alloys have better lithium intercalation potential and higher mas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/12Y02E60/10
Inventor 谢健郑云肖刘双宇宋文涛朱铁军曹高劭赵新兵
Owner ZHEJIANG UNIV
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