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Preparation method of SnO2/SnS2 nano composite electrode material of lithium ion battery

A lithium-ion battery, nanocomposite technology, used in battery electrodes, electrode manufacturing, circuits, etc.

Inactive Publication Date: 2011-08-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, a solution containing L-cysteine ​​and SnCl4 has been used to synthesize lithium-ion batteries SnO2 / SnS2 in one step. Nanocomposite anode materials have not been reported yet

Method used

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  • Preparation method of SnO2/SnS2 nano composite electrode material of lithium ion battery
  • Preparation method of SnO2/SnS2 nano composite electrode material of lithium ion battery

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Experimental program
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Embodiment 1

[0018] 1) Dissolve 0.49g (4mmol) L-cysteine ​​in 160ml deionized water, then add 0.70g (2mmol) tin tetrachloride (SnCl 4 ·5H 2 O), and stirred to make it dissolve, L-cysteine ​​and SnCl in the mixed solution 4 The molar ratio is 2:1.

[0019]2) Transfer the obtained mixed solution into a polytetrafluoroethylene liner reactor, seal it, keep the reactor at 180° C. for 8 hours, and then cool it down to room temperature. The precipitate was obtained by centrifugation, washed thoroughly with deionized water and absolute ethanol, and dried in vacuum to obtain the lithium-ion battery SnO 2 / SnS 2 Nanocomposite electrode materials. X-ray diffraction (XRD) analysis shows that in the XRD figure of the obtained product there is corresponding to SnO 2 and SnS 2 XRD diffraction peaks, indicating that the resulting product is SnO 2 / SnS 2 nanocomposites (see figure 1 ). SnO observed by transmission electron microscope (TEM) 2 / SnS 2 The shape of the nanocomposite material is na...

Embodiment 2

[0022] 1) Dissolve 0.48g (4mmol) L-cysteine ​​in 150ml deionized water, then add 1.4g (4mmol) tin tetrachloride (SnCl 4 ·5H 2 O), and stirred to make it dissolve, L-cysteine ​​and SnCl in the mixed solution 4 The molar ratio is 1:1.

[0023] 2) Transfer the obtained mixed solution into a polytetrafluoroethylene liner reactor, seal it, keep the reactor at 200° C. for 10 hours, and then cool it down to room temperature. The precipitate was obtained by centrifugation, washed thoroughly with deionized water and absolute ethanol, and dried in vacuum to obtain the lithium-ion battery SnO 2 / SnS 2 Nanocomposite electrode materials. X-ray diffraction (XRD) analysis shows that in the XRD figure of the obtained product there is corresponding to SnO 2 and SnS 2 XRD diffraction peaks, indicating that the resulting product is SnO 2 / SnS 2 nanocomposites. SnO observed by transmission electron microscope (TEM) 2 / SnS 2 The shape of the nanocomposite material is nanoparticles, and ...

Embodiment 3

[0026] 1) Dissolve 0.73g (6mmol) L-cysteine ​​in 150ml deionized water, then add 1.4g (4mmol) tin tetrachloride (SnCl 4 ·5H 2 O), and stirred to make it dissolve, L-cysteine ​​and SnCl in the mixed solution 4 The molar ratio is 1.5:1.

[0027] 2) Transfer the obtained mixed solution to a polytetrafluoroethylene liner reactor, seal it, keep the reactor at 200°C for 10 hours, and then cool to room temperature. The precipitate was obtained by centrifugation, washed thoroughly with deionized water and absolute ethanol, and dried in vacuum to obtain the lithium-ion battery SnO 2 / SnS 2 Nanocomposite electrode materials. X-ray diffraction (XRD) analysis shows that in the XRD figure of the obtained product there is corresponding to SnO 2 and SnS 2 XRD diffraction peaks, indicating that the resulting product is SnO 2 / SnS 2 nanocomposites. SnO observed by transmission electron microscope (TEM) 2 / SnS 2 The shape of the nanocomposite material is nanoparticles, and its partic...

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Abstract

The invention discloses a preparation method of SnO2 / SnS2 nano composite electrode material of a lithium ion battery, comprising the following steps: dissolving L-cysteine in deionized water, then adding stannic chloride and fully stirring the solution to dissolve the stannic chloride; transferring the mixed solution in a reaction kettle with a polytetrafluoroethylene tank to react hydrothermal reaction at 180-220 DEG C for 8-12h, then cooling naturally to the room temperature, centrifugalizing the products to obtain precipitate, cleaning the precipitate fully and finally obtaining the SnO2 / SnS2 nano composite electrode material of the lithium ion battery after vacuum drying; wherein, the molar ratio of L-cysteine to stannic chloride is 2.2:1-1:1. The SnO2 / SnS2 nano composite electrode material of the lithium ion battery prepared by the method of the invention has high electrochemical capacity and good cyclic stability.

Description

technical field [0001] The present invention relates to the preparation method of lithium ion battery electrode material, especially preparation lithium ion battery SnO 2 / SnS 2 A method for nanocomposite anode materials. Background technique [0002] Lithium-ion batteries have excellent properties such as high specific energy, no memory effect, and environmental friendliness, and have been widely used in portable mobile appliances such as mobile phones and notebook computers. As a power battery, lithium-ion batteries also have broad application prospects in electric bicycles and electric vehicles. At present, graphite materials (such as: graphite microspheres, natural modified graphite and artificial graphite, etc.) are mainly used as negative electrode materials for lithium-ion batteries. These graphite materials have good cycle stability, but their capacity is low. The theoretical capacity of graphite is 372mAh / g. The new generation of lithium-ion batteries puts forwa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/48H01M4/58
CPCY02E60/12Y02E60/10
Inventor 李辉陈卫祥常焜
Owner ZHEJIANG UNIV
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