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A kind of hydrogel-derived sn-fe-c micro-nano material and its preparation method and application

A technology of micro-nano material and sn-fe-c is applied to the application of Sn-Fe-C micro-nano material in the anode material of lithium ion battery. The above-mentioned preparation field of Sn-Fe-C micro-nano material can solve the restriction Commercial applications, difficulty in achieving uniform distribution of Sn and Fe and Sn-Fe alloys and carbon media, difficulty in preparing nano-unit micro-materials, etc., to achieve good lithium storage performance, improved lithium storage performance, good structural stability and charge transport The effect of

Active Publication Date: 2020-01-07
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, on the one hand, the products obtained by the above-mentioned ball milling method and liquid phase reduction method are single micron materials or nanomaterials, and it is difficult to prepare micron materials (micro-nano materials) assembled by nano-units; on the other hand, the above-mentioned methods are difficult to realize The uniform distribution of Sn and Fe and Sn-Fe alloy and carbon medium at the nanometer scale fails to give full play to the buffering / conducting effect of metallic iron and carbon medium on the tin component; thus it is impossible to obtain high-performance Sn-Fe-C negative electrode materials, restricts its commercial application

Method used

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  • A kind of hydrogel-derived sn-fe-c micro-nano material and its preparation method and application
  • A kind of hydrogel-derived sn-fe-c micro-nano material and its preparation method and application
  • A kind of hydrogel-derived sn-fe-c micro-nano material and its preparation method and application

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Effect test

Embodiment 1

[0037] The preparation method of the hydrogel-derived Sn-Fe-C micro-nano material of the present invention comprises the following steps:

[0038] Step 1, dissolving required amount of tin tetrachloride and potassium ferrocyanide in citric acid aqueous solution respectively, obtain tin tetrachloride-citric acid mixed solution and potassium ferrocyanide-citric acid mixed solution respectively, lemon In acid aqueous solution, the mass concentration of citric acid is 0.1g / mL; in the tin tetrachloride-citric acid mixed solution, the tin tetrachloride concentration is 0.2mol / L, in the potassium ferrocyanide-citric acid mixed solution, The concentration of potassium ferricyanide is 0.2mol / L;

[0039] Step 2, mix tin tetrachloride-citric acid mixed solution and potassium ferrocyanide-citric acid mixed solution in step 1 to obtain citric acid complex Sn(IV)-Fe(II) cyano bridged coordination polymerization Material hydrogel (Fe-C≡N-Sn); in the coordination polymer hydrogel, the molar ...

Embodiment 2

[0044] The preparation method of the hydrogel-derived Sn-Fe-C micro-nano material of the present invention comprises the following steps:

[0045] Step 1, dissolving the required amount of tin tetrachloride and potassium ferrocyanide in aqueous polyethylene glycol solution respectively to obtain tin tetrachloride-polyethylene glycol mixed solution and potassium ferrocyanide-polyethylene glycol solution respectively Glycol mixed solution, in polyethylene glycol aqueous solution, the mass concentration of polyethylene glycol is 0.5g / mL; In tin tetrachloride-polyethylene glycol mixed solution, tin tetrachloride concentration is 0.2mol / L, sub- In potassium ferricyanide-polyethylene glycol mixed solution, the concentration of potassium ferrocyanide is 0.2mol / L;

[0046] Step 2, mix tin tetrachloride-polyethylene glycol mixed solution and potassium ferrocyanide-polyethylene glycol mixed solution in step 1 to obtain polyethylene glycol-complexed Sn(IV)-Fe(II) cyanide Base bridging c...

Embodiment 3

[0051] The preparation method of the hydrogel-derived Sn-Fe-C micro-nano material of the present invention comprises the following steps:

[0052] Step 1, dissolving the required amount of tin tetrachloride and potassium ferrocyanide in the aqueous urea solution respectively to obtain tin tetrachloride-urea mixed solution and potassium ferrocyanide-urea mixed solution respectively, in the aqueous urea solution, The mass concentration of urea is 0.2g / mL; In tin tetrachloride-urea mixed solution, tin tetrachloride concentration is 0.05mol / L, in potassium ferrocyanide-urea mixed solution, the concentration of potassium ferrocyanide is 0.5mol / L;

[0053] Step 2, mix the tin tetrachloride-urea mixed solution and the potassium ferrocyanide-urea mixed solution in step 1 to obtain the urea composite Sn(IV)-Fe(II) cyano group bridged coordination polymer hydraulic coagulation glue; in the coordination polymer hydrogel, the molar ratio of tin tetrachloride and potassium ferrocyanide is...

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Abstract

The invention discloses a hydrogel-derived Sn-Fe-C micro nano material and a preparation method and application thereof in preparation of a lithium ion battery negative electrode material. The hydrogel-derived Sn-Fe-C micro nano material is used as the lithium ion battery negative electrode material, in the structure, the Sn-Fe-C micro nano material has nano structure unit and micro assembly body structural characteristics, can exhibit good structural stability and charge transport ability; in the composition, Sn, Fe, Sn-Fe alloy and a carbon medium are highly uniformly distributed in the Sn-Fe-C micro nano material, and buffer / conductive effect of the metal iron and the carbon medium on the tin component can be fully played, so that the hydrogel-derived Sn-Fe-C micro nano material can exhibit good lithium storage performance, and also has good cyclic stability and high specific capacity and rate capability.

Description

technical field [0001] The present invention relates to a hydrogel-derived Sn-Fe-C micro-nano material, and also relates to the preparation method of the above-mentioned Sn-Fe-C micro-nano material and the use of the Sn-Fe-C micro-nano material in lithium-ion battery negative electrode materials Applications. Background technique [0002] At present, the world is facing two severe challenges of energy crisis and environmental pollution. Lithium-ion batteries have the advantages of high energy density, long cycle life, no memory effect, and environmental friendliness. They have shown attractive prospects in the fields of transportation and energy storage such as electric vehicles, grid peak regulation, and renewable energy storage. Saving and efficient utilization, reducing carbon emissions and environmental protection are of great significance and have become the focus of global attention. At present, graphite-like carbon materials are mainly used as anode materials for co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/362H01M4/387H01M4/625H01M4/626H01M10/0525Y02E60/10
Inventor 吴平史红霞张秀奎徐孝诚张晨星张安萍周益明
Owner NANJING NORMAL UNIVERSITY