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PMMA-coated hollow tin alloy nanoparticles and preparation method and application thereof

A technology of alloy nanoparticles and nanoparticles, which is applied in the field of nanomaterials and its applications, can solve the problems of poor structural stability and interface stability, and achieve the effects of mild and controllable conditions, good electrochemical performance, and avoiding direct contact

Inactive Publication Date: 2015-03-25
SHANDONG YUHUANG NEW ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of poor structural stability and interface stability of hollow tin nanoparticles as lithium battery negative electrode materials in the prior art, the invention provides a hollow tin alloy nanoparticle coated with PMMA, its preparation method and its application

Method used

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  • PMMA-coated hollow tin alloy nanoparticles and preparation method and application thereof
  • PMMA-coated hollow tin alloy nanoparticles and preparation method and application thereof
  • PMMA-coated hollow tin alloy nanoparticles and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0033] The preparation method of the PMMA-coated hollow tin alloy nanoparticles may further comprise the steps:

[0034] 1) Weigh 2g NiCl 2 ·6H 2 O was stirred and dissolved in 100 mL of absolute ethanol, and 1 mol / L NaOH solution was added dropwise under stirring conditions to adjust the pH value to 12, heated to 60 °C, and 15 mL of hydrazine hydrate ( 80wt%), constant temperature and continuous stirring reaction for 50 min; after the reaction, the black substance was centrifuged at a speed of 10000 r / min, washed 3-5 times with distilled water and absolute ethanol respectively, and then the black substance was placed in In a vacuum drying oven, vacuum-dry at 80 °C for 12 h to prepare nickel nanoparticles, which are stored for later use; the prepared nickel nanoparticles are analyzed by transmission electron microscope, and the results are as follows: figure 1 shown.

[0035] 2) Weigh 1.5 g SnSO 4 Dissolved in 150 mL of distilled water, stirred magnetically, and then weigh...

Embodiment 2

[0038] The preparation method of the PMMA-coated hollow tin alloy nanoparticles may further comprise the steps:

[0039] 1) Weigh 2g NiCl 2 ·6H 2 O was stirred and dissolved in 100 mL of absolute ethanol, and 1 mol / L NaOH solution was added dropwise under stirring to adjust the pH value to 12, heated to 70°C, and 15 mL of hydrazine hydrate ( 80wt%), constant temperature and continuous stirring reaction for 50 min; after the reaction, the black substance was centrifuged at a speed of 10000 r / min, washed 3-5 times with distilled water and absolute ethanol respectively, and then the black substance was placed in In a vacuum drying oven, vacuum-dry at 80 °C for 12 h to prepare nickel nanoparticles, which are stored for later use.

[0040] 2) Weigh 1.5 g SnSO 4 Dissolved in 150 mL of distilled water, stirred magnetically, and then weighed 0.5 g of Ni nanoparticles, ultrasonically dispersed in the above-prepared SnSO 4 solution; the oil bath was heated to 100 °C, and the reactio...

Embodiment 3

[0044] The preparation method of the PMMA-coated hollow tin alloy nanoparticles may further comprise the steps:

[0045] 1) Weigh 2g NiCl 2 ·6H 2 O was stirred and dissolved in 100 mL of absolute ethanol, and 1 mol / L NaOH solution was added dropwise under stirring to adjust the pH value to 12, heated to 80°C, and 15 mL of hydrazine hydrate ( 80wt%), constant temperature and continuous stirring reaction for 50 min; after the reaction, the black substance was centrifuged at a speed of 10000 r / min, washed 3-5 times with distilled water and absolute ethanol respectively, and then the black substance was placed in In a vacuum drying oven, vacuum-dry at 80 °C for 12 h to prepare nickel nanoparticles, which are stored for later use.

[0046] 2) Weigh 1.5 g SnSO 4 Dissolved in 150 mL of distilled water, stirred magnetically, and then weighed 0.5 g of Ni nanoparticles, ultrasonically dispersed in the above-prepared SnSO 4 solution; the oil bath was heated to 120 °C, and the reactio...

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Abstract

The invention discloses PMMA-coated hollow tin alloy nanoparticles and a preparation method and application thereof. The preparation method comprises the following steps: preparing nickel nanoparticles with the uniform particle sizes by using a chemical reduction method; by taking the nickel nanoparticles as a template, preparing hollow tin alloy nanoparticles by utilizing a current replacement method, and coating the hollow tin alloy nanoparticles by using an in situ PMMA bulk polymerization method. The PMMA-coated hollow Sn-Ni alloy nanoparticle coating layer disclosed by the invention is controllable in thickness, uniform in particle size and uniform in coating layer thickness. Inactive substances are added into tin metal, and the volume expansion in the tin and lithium alloying process can be relieved by preventing the tin accumulation in the lithium ion embedding and separating process, so that the aim of improving the charge-discharge cycle stability performance of the PMMA-coated hollow tin alloy nanoparticles is achieved, and the volume change of tin serving as a lithium ion battery negative pole material is relieved by utilizing the flexibility of the internal hollow structure and surface polymers. According to PMMA coating, the direct contact among the Sn-Ni alloy nanoparticles can be avoided.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and their applications, in particular to PMMA-coated hollow tin alloy nanoparticles, a preparation method and applications thereof. Background technique [0002] In the past ten years, hollow materials have been one of the research hotspots. Because of their unique structural characteristics, they have been widely used in many fields, such as catalysis, fuel cells, biotechnology, lubrication, nanoreactors, energy storage (such as lithium Ion batteries, etc.) and other applications have shown excellent performance. Hollow structure materials have received more and more attention and research as electrode materials for lithium-ion batteries. Many high-capacity silicon-based, tin-based, germanium-based and other electrode materials will undergo serious volume expansion during the lithium alloying process, resulting in mechanical stress, resulting in powdering and peeling of the active material...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/1395H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/1395H01M4/366H01M4/387H01M4/62H01M10/0525H01M2004/021Y02E60/10
Inventor 石永倩唐其伟刘军赵成龙
Owner SHANDONG YUHUANG NEW ENERGY TECH
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