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Tin dioxide/nickel ferrite/graphene composite material as well as preparation method and application thereof

A technology of graphene composite and composite materials, which is applied in the direction of secondary batteries, electrochemical generators, structural parts, etc., can solve the problems of unsuitability for large-scale industrial production, excessive resource consumption, and harsh synthesis conditions. The method is environmentally friendly, the particles are uniform, and the shape is controllable

Inactive Publication Date: 2017-08-15
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its synthesis conditions are relatively harsh, and it needs to be continuously calcined at a high temperature above 1000 ° C for 20 hours.
The process is cumbersome, the resource consumption is too large, and it is not suitable for large-scale industrial production

Method used

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  • Tin dioxide/nickel ferrite/graphene composite material as well as preparation method and application thereof
  • Tin dioxide/nickel ferrite/graphene composite material as well as preparation method and application thereof
  • Tin dioxide/nickel ferrite/graphene composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In the first step, 0.34 g of nickel nitrate hexahydrate and 0.93 g of iron nitrate nonahydrate were dissolved in 25 mL of deionized water.

[0036] In the second step, 0.045 g of stannous chloride dihydrate was dissolved in 25 mL of ethylene glycol solution.

[0037] In the third step, 100 mg of graphite oxide was dissolved in 25 mL of deionized water and ultrasonically dispersed to form a uniformly dispersed single-layer graphene oxide mixed solution.

[0038] In the fourth step, slowly add the mixed solution obtained in the first step and the second step into the single-layer graphene oxide mixed solution obtained in the third step and continue stirring for 30 minutes to form a mixed solution 1.

[0039] Step 5: Add 4 g of urea to the mixed solution 1, and continue stirring for 30 minutes to obtain the mixed solution 2.

[0040] In the sixth step, the mixed solution 2 was transferred to a 100 mL stainless steel reactor and reacted at 180° C. for 20 h.

[0041] In the ...

Embodiment 2

[0048] In the first step, 0.26 g of nickel nitrate hexahydrate and 0.73 g of iron nitrate nonahydrate were dissolved in 25 mL of deionized water.

[0049] In the second step, 0.135 g of stannous chloride dihydrate was dissolved in 25 mL of ethylene glycol solution.

[0050] In the third step, 100 mg of graphite oxide was dissolved in 25 mL of deionized water and ultrasonically dispersed to form a uniformly dispersed single-layer graphene oxide mixed solution.

[0051] In the fourth step, slowly add the mixed solution obtained in the first step and the second step into the single-layer graphene oxide mixed solution obtained in the third step and continue stirring for 30 minutes to form a mixed solution 1.

[0052] Step 5: Add 4 g of urea to the mixed solution 1, and continue stirring for 30 minutes to obtain the mixed solution 2.

[0053] In the sixth step, the mixed solution 2 was transferred to a 100 mL stainless steel reactor and reacted at 180° C. for 20 h.

[0054] In th...

Embodiment 3

[0060] In the first step, 0.19 g of nickel nitrate hexahydrate and 0.52 g of iron nitrate nonahydrate were dissolved in 25 mL of deionized water.

[0061] In the second step, 0.225 g of stannous chloride dihydrate was dissolved in 25 mL of ethylene glycol solution.

[0062] In the third step, 100 mg of graphite oxide was dissolved in 25 mL of deionized water and ultrasonically dispersed to form a uniformly dispersed single-layer graphene oxide mixed solution.

[0063] In the fourth step, slowly add the mixed solution obtained in the first step and the second step into the single-layer graphene oxide mixed solution obtained in the third step and continue stirring for 30 minutes to form a mixed solution 1.

[0064] Step 5: Add 4 g of urea to the mixed solution 1, and continue stirring for 30 minutes to obtain the mixed solution 2.

[0065] In the sixth step, the mixed solution 2 was transferred to a 100 mL stainless steel reactor and reacted at 180° C. for 20 h.

[0066] In th...

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Abstract

The invention discloses a tin dioxide / nickel ferrite / graphene composite material and a preparation method thereof. The composite material is compounded from tin dioxide, nickel ferrite and graphene, wherein the tin dioxide accounts for 10-70wt% of the composite material by mass, and the graphene accounts for 25-30wt% of the composite material by mass. Through X-ray diffraction and transmission electron microscope technical analysis, the composite material contains nickel ferrite and tin dioxide particles uniformly dispersed on graphene sheets; observed from a CV curve, with the increase of the mass of the doped tin dioxide, the tin dioxide gradually participates in electrochemical reaction, thereby greatly improving the lithium storage property of the composite material; discovered by a cycle test, the composite material has preferable cycle performance and higher stability; and under the current density of 0.2A g<-1>, the electrode material can keep the specific capacity of 500-700mAh g<-1> after 50 cycles, and the specific capacity is 50-80% of the specific capacity of the first discharge.

Description

technical field [0001] The invention belongs to the field of new energy sources of lithium ion batteries. It specifically relates to a tin dioxide / nickel ferrite / graphene composite material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in people's daily production and life because of their unique advantages that the energy density is much higher than other secondary batteries. For example, lithium-ion batteries can be seen in many electronic devices such as mobile phones, laptops, and Tesla electric vehicles. figure. However, the current commercial lithium-ion battery industrial technology is far from meeting people's needs, especially in related fields such as hybrid electric vehicles (HEV) and pure electric vehicles (EV), which require relatively high energy storage. In order to meet these special needs, there is an urgent need to develop a new generation of lithium-ion batteries with high energy den...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/525H01M4/583H01M4/62H01M10/0525
CPCH01M4/36H01M4/48H01M4/525H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 郝青丽颜帅雷武夏锡锋
Owner NANJING UNIV OF SCI & TECH
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