Preparation method of anode material, namely nitrogen-doped SnS/C composite nanomaterial for lithium battery

A negative electrode material, lithium battery technology, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problem of difficult to control the volume expansion of SnS negative material, to avoid the capacity decay too fast, inhibit the The effect of volume expansion and simple process

Active Publication Date: 2016-05-04
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that it is difficult to control the volume expansion of SnS negative electrode materials in the current technology, and to provide a method for preparing nitrogen-doped SnS / C composite nanomaterials for lithium ion battery negative electrode materials

Method used

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  • Preparation method of anode material, namely nitrogen-doped SnS/C composite nanomaterial for lithium battery
  • Preparation method of anode material, namely nitrogen-doped SnS/C composite nanomaterial for lithium battery
  • Preparation method of anode material, namely nitrogen-doped SnS/C composite nanomaterial for lithium battery

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Experimental program
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Embodiment 1

[0030] according to figure 1 The process shown in the preparation of nitrogen-doped SnS / C composite nanomaterials, 20mmol of 4-octyloxy-4'-(10-mercaptodecyloxy) azobenzene and 20mmol of triethylammonium were added to 60ml of toluene, stirred for 20min to make After uniform dispersion, add 10mmol SnCl 2 , Reaction at room temperature for 6h. After the reaction was completed, cool to room temperature, filter to obtain a crude product, wash the crude product with ethanol several times, and vacuum-dry the obtained sample at 80° C. for 6 hours to obtain a yellow SnS precursor. 0.5 g of the aforementioned SnS precursor was accurately weighed, and then calcined at 700° C. for 4 h in a nitrogen atmosphere to finally obtain a black nitrogen-doped SnS / C composite nanomaterial.

[0031] The prepared nitrogen-doped SnS / C composite nanomaterials were characterized by X-ray diffraction analysis, the results are as follows figure 2 shown. Characterized by transmission electron microscop...

Embodiment 2

[0033] Add 20mmol of 4-octyloxy-4'-(10-mercaptodecyloxy)azobenzene and 22mmol of triethylammonium into 60ml of toluene, stir for 20min to disperse evenly, then add 11mmol of SnCl 2 , Reaction at room temperature for 6h. After the reaction was completed, cool to room temperature, filter to obtain a crude product, wash the crude product with ethanol several times, and vacuum-dry the obtained sample at 100° C. for 4 hours to obtain a yellow SnS precursor. 1 g of the SnS precursor was accurately weighed, and calcined at 600° C. for 8 h in a nitrogen atmosphere to finally obtain a black nitrogen-doped SnS / C composite material.

Embodiment 3

[0035] Add 20mmol of 4-octyloxy-4'-(10-mercaptodecyloxy)azobenzene and 24mmol of triethylammonium into 60ml of toluene, stir for 20min to disperse evenly, then add 12mmol of SnCl 2, Reaction at room temperature for 6h. After the reaction was completed, cool to room temperature, filter to obtain a crude product, wash the crude product with ethanol several times, and vacuum-dry the obtained sample at 100° C. for 6 hours to obtain a yellow SnS precursor. 0.6 g of the SnS precursor was accurately weighed, and then calcined at 800° C. for 4 h in a nitrogen atmosphere to finally obtain a black nitrogen-doped SnS / C composite material.

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Abstract

The invention discloses a preparation method of an anode material for a lithium battery. The method comprises the following steps: (1) adding azobenzene mercaptan and an acid-binding agent to a toluene solution, mixing the azobenzene mercaptan and the acid-binding agent evenly, adding stannous chloride, and carrying out room-temperature reaction under protection of nitrogen for 6 hours; (2) filtering a reaction liquid, washing a filter cake with absolute ethyl alcohol, and carrying out heat preservation on the filter cake in a forced air oven at 80-120 DEG C for 4-8 hours to obtain a dry SnS precursor; and (3) heating the SnS precursor under protection of an inert atmosphere for burning to prepare the black nitrogen-doped SnS / C composite nanomaterial. The composite material prepared by the method is used as the anode material for the lithium-ion battery, so that SnS volume expansion during charging and discharging can be effectively relieved; and the problems of charge-discharge efficiency reduction and overquick capacity degradation are suppressed.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a battery negative electrode material, in particular to a method for preparing a high-capacity lithium ion battery negative electrode material nitrogen-doped SnS / C composite nanomaterial. Background technique [0002] With the gradual depletion of global non-renewable energy resources, encouraging the development of new energy has become the energy strategic focus of many countries. Lithium-ion batteries are becoming the most potential power source in new energy vehicle power batteries due to their excellent performance. As one of the important factors to improve the energy and cycle life of lithium-ion batteries, anode materials for lithium-ion batteries have been extensively studied worldwide. [0003] In recent years, SnS is considered as a promising anode material due to its high theoretical capacity (782mAh / g), abundant sources, low cost, and low pollution, and has been e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/5815H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 段军飞陈召勇李灵均
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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