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Preparation method of carbon-coated nano tin balls and products and application thereof

A nano-tin and carbon coating technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of complex method, cumbersome process, high cost, achieve simple process, avoid agglomeration, Easy-to-control effects

Inactive Publication Date: 2018-02-02
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Throughout the literature reports on tin-based materials for lithium-ion batteries, the process of controlling the morphology of tin nanomaterials and carbon coating is often divided into two steps. First, nano-tin materials are prepared, and then the coating process is completed; such synthesis methods are relatively complicated. , the process is cumbersome, time-consuming, low yield, generally high cost

Method used

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  • Preparation method of carbon-coated nano tin balls and products and application thereof
  • Preparation method of carbon-coated nano tin balls and products and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] First, weigh 0.72 g of tin tetrachloride pentahydrate, dissolve it in 30 mL of deionized water, and stir for 30 minutes; then add 1.0 g of sodium oleate to the solution, and carry out ion exchange at 80°C for 6 hours to obtain Mixture of acid tin. Add 2.5 g of sodium carbonate crystals to the tin oleate mixture, and stir well until the tin oleate is evenly dispersed. The obtained tin oleate / sodium carbonate crystal material was placed in a tube furnace, raised to 700°C at a rate of 3°C / min under nitrogen protection, kept at 700°C for 6 hours, cooled naturally, and washed with deionized water , drying, and finally obtain the carbon-coated tin / stannous oxide nanosphere material. figure 1 It is the SEM picture of the tin / carbon composite material of this embodiment. It can be seen from the figure that it has a spherical structure with an average size of 10-25 nm; the outer layer of the tin ball is covered with a soft carbon layer. figure 2 It is the TEM image of the tin...

Embodiment 2

[0029] First, weigh 0.72 g of tin tetrachloride pentahydrate, dissolve it in 30 mL of deionized water, and stir for 30 minutes; then add 1.0 g of sodium oleate to the solution, and carry out ion exchange at 80°C for 6 hours to obtain Mixture of acid tin. Add 5.0 g of sodium carbonate crystals to the tin oleate mixture, and stir well until the tin oleate is evenly dispersed. The obtained tin oleate / sodium carbonate crystal material was placed in a tube furnace, raised to 700°C at a rate of 3°C / min under nitrogen protection, kept at 700°C for 6 hours, cooled naturally, and washed with deionized water , drying, and finally the carbon-coated tin / sn2 oxide nanosphere material can still be obtained.

Embodiment 3

[0031]First, weigh 0.72 g of tin tetrachloride pentahydrate, dissolve it in 30 mL of deionized water, and stir for 30 minutes; then add 1.0 g of sodium oleate to the solution, and carry out ion exchange at 80°C for 6 hours to obtain Mixture of acid tin. Add 5.0 g of sodium sulfate crystals to the tin oleate mixture, and stir well until the tin oleate is evenly dispersed. The obtained tin oleate / sodium sulfate crystal material was placed in a tube furnace, raised to 700°C at a rate of 3°C / min under nitrogen protection, kept at 700°C for 6 hours, cooled naturally, and washed with deionized water , drying, and finally carbon-coated tin / stannous oxide composites can still be obtained.

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Abstract

The invention discloses a preparation method of carbon-coated nano tin balls and products and application thereof. The preparation method includes: preparing tin oleate mixed liquid, adding the tin oleate mixed liquid into a crystal template, sufficiently stirring and dispersing to enable tin oleate to effectively cover the surface of the crystal template; transferring a mixture of tin oleate andthe crystal template into a tubular furnace, calcining in an atmosphere of protective gas to obtain solid powder, washing the solid powder, and drying to finally obtain a carbon / tin nano composite material. By the preparation method, preparation of a nanocrystal / carbon material is realized through only one step of direct heating, and obtained tin balls are small in nanocrystal size and complete incarbon coating; the preparation method is simple in step and process and easy to control. The products are conducive to shortening lithium ion transmission path and can inhibit volume expansion of tin in the process of charging and discharging and can avoid the problem of agglomeration of tin in the process of intercalation and deintercalation, lithium storage performance of tin is improved effectively, and the tin balls have great application potential in lithium ion battery electrode materials.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, and in particular relates to a preparation method of carbon-coated nano tin balls and its products and applications. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density and low self-discharge rate, and have been widely used in portable electronic products such as mobile phones, notebook computers, and digital cameras. However, its energy density still cannot meet the needs of emerging electric vehicles. As a key part of lithium batteries, electrode materials determine the electrochemical performance. 1 mol of tin can be alloyed with 4.4 mol of lithium, and the theoretical specific capacity is as high as 990 mAhg -1 , nearly three times that of graphite. The lithium intercalation potential is moderate, which avoids the deposition problem of lithium metal, has little environmental pollution, and is cheap. Therefore, it is expected to replac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/387H01M4/625H01M4/628H01M10/0525H01M2004/021Y02E60/10
Inventor 何丹农王敬锋林琳金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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