Preparation method of lithium ion battery SnS2/CNTs/PPy composite anode material

A technology for lithium ion batteries and negative electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of unsatisfactory cycle performance and low capacity of lithium battery negative electrode materials, so as to improve cycle stability, improve electrical conductivity, improve The effect of overall performance

Inactive Publication Date: 2015-01-28
SHENZHEN POLYTECHNIC
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is: the current negative electrode materials of lithium batteries have the problems of low capacity and unsatisfactory cycle performance, and a kind of SnS for lithium ion batteries is proposed. 2 The preparation method of / CNTs / PPy composite negative electrode material improves the cycle stability of the electrode, and prepares a high-capacity and high-stability lithium-ion battery negative electrode material, thereby improving the overall performance of the power lithium-ion battery

Method used

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  • Preparation method of lithium ion battery SnS2/CNTs/PPy composite anode material
  • Preparation method of lithium ion battery SnS2/CNTs/PPy composite anode material

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preparation example Construction

[0025] The present invention proposes a lithium ion battery SnS 2 / CNTs / PPy composite anode material preparation method, wherein, SnS 2 It is tin disulfide, CNTs is carbon nanotubes (Carbon nanotubes), PPy is polypyrrole, and the preparation method includes the following steps:

[0026] Step 1: Add SnCl 4 ·5H 2 Add O and thioacetamide (TAA) into the polyethylene glycol solution and stir well;

[0027] In step 1, the selected SnCl 4 ·5H 2 Both O and TAA were analytically pure, and SnCl 4 ·5H 2 The ratio of the amount of O and TAA substances is controlled at: SnCl 4 ·5H 2 O: TAA = 1:1;

[0028] Step 2: Add a certain amount of carbon nanotubes (CNTs) to the above solution, and ultrasonically disperse for 60 minutes;

[0029] In step 2, the mass of added CNTs is the theoretically obtained SnS 2 0.5%~10% of the alloy mass;

[0030] Step 3: transfer the solution obtained in step 2 into an automatic reaction kettle of polytetrafluoroethylene, carry out insulation treatmen...

Embodiment 1

[0039] Take 1.42 g SnCl 4 ·5H 2 O and 0.60 g of thioacetamide (TAA) were dissolved in 100 ml of polyethylene glycol (PEG 400) by stirring. After TAA was dissolved, 0.0070 g of carbon nanotubes were uniformly dispersed in the solution, and ultrasonically dispersed for 60 min. Finally, the above solution was transferred into an automatic polytetrafluoroethylene reactor and heated in an oven at 180°C for 18h. The cooled product was washed three times with deionized water and ethanol, and dried in vacuum at 80 °C for 24 h to obtain light yellow SnS 2 / CNTs composites.

[0040] The above SnS 2 / CNTs composite material was dissolved in 40ml deionized water, stirred for 30min, added 8mg sodium dodecyl sulfate and stirred for 30min, then added 104μL pyrrole monomer and 0.40g FeCl 3 ·6H 2 O, the mixed solution was stirred at room temperature for 4h. The obtained solution was separated by centrifugation, washed three times with deionized water and absolute ethanol, and the separa...

Embodiment 2

[0044] The difference between this example and Example 1 is: the mass of carbon nanotubes added is 0.0035g, the insulation condition in the automatic reactor is 180°C for 14h, the mass of sodium lauryl sulfate added is 24mg, pyrrole The amount of monomer is 82 μL, add FeCl 3 ·6H 2 The mass of O is 0.32 g, and the product is vacuum-dried at 100° C. for 6 h. Others are all the same as in Example 1.

[0045] The constant current charge and discharge test of the composite negative electrode material described in this example shows that the electrochemical performance remains basically unchanged, and the initial discharge capacity is 1184 mAh g -1 , after 30 cycles, the reversible capacity can be maintained at 410mAh·g -1 .

[0046]

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Abstract

The invention relates to a preparation method of a lithium ion battery SnS2/CNTs/PPy composite anode material. The preparation method comprises the following steps: Step One, adding SnCl4.5H2O and thioacetamide to a polyethylene glycol solution, and sufficiently and uniformly stirring; Step Two, adding a carbon nano tube to the solution, and carrying out ultrasonic dispersion for 60 min; Step Three, transferring the solution obtained in the step two into an automatic reaction kettle of polytetrafluoroethylene, and carrying out furnace cooling after insulation treatment; Step Four, carrying out centrifugal separation on the solution obtained in the step three, washing with deionized water and absolute ethyl alcohol, and carrying out vacuum drying; Step Five, dissolving an SnS2/CNTs composite material obtained in the step four to the deionized water, uniformly stirring, adding lauryl sodium sulfate, adding pyrrole monomers and oxidizing agent, and stirring at room temperature for reaction for four hours; Step Six, carrying out centrifugal separation on the solution obtained in the step five, washing with deionized water and absolute ethyl alcohol, and carrying out vacuum drying. The anode material obtained by the preparation method is high in capacity and good in cycle performance, and has potential application prospects in the fields of portable electronic equipment, electric vehicles, aerospace and the like.

Description

technical field [0001] The invention relates to the field of lithium ion battery negative electrode materials, in particular to a lithium ion battery SnS 2 / CNTs / PPy composite anode material preparation method. SnS 2 That is tin disulfide, CNTs is carbon nanotubes (Carbon nanotubes), PPy is polypyrrole. Background technique [0002] With the development of microelectronics technology and new energy vehicles, high requirements are placed on power supplies. Lithium-ion batteries have become the focus of attention due to their high charging efficiency and high energy density. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, and electrolytes. Among them, the negative electrode material is mainly used as the main body of lithium storage, and it is a key part of the whole battery to realize the intercalation and extraction of lithium ions during the charging and discharging process. At present, the anodes of commercial lithium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/583
CPCH01M4/1393H01M4/583Y02E60/10
Inventor 罗大为
Owner SHENZHEN POLYTECHNIC
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