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Preparation method of C/SnO2/CNT (carbon nano tube) composite material of core shell structure for lithium ion battery cathode

A lithium-ion battery, core-shell structure technology, applied in nanotechnology for materials and surface science, battery electrodes, secondary batteries, etc., can solve problems such as the volume expansion of SnO2, and achieve short cycle times and excellent morphology Uniformity and simple preparation method

Inactive Publication Date: 2016-10-12
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0005] It can be seen that the compounding with carbon nanotubes can improve the purity of pure SnO to a certain extent. 2 electrochemical performance, but current reports are limited to SnO 2 Nanoparticles grow on the surface of carbon nanotubes, which still does not solve the problem of SnO 2 Volume expansion problem during cycling

Method used

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  • Preparation method of C/SnO2/CNT (carbon nano tube) composite material of core shell structure for lithium ion battery cathode
  • Preparation method of C/SnO2/CNT (carbon nano tube) composite material of core shell structure for lithium ion battery cathode
  • Preparation method of C/SnO2/CNT (carbon nano tube) composite material of core shell structure for lithium ion battery cathode

Examples

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Effect test

Embodiment 1

[0030] 1) Evenly disperse 30 mg of carboxylated carbon nanotubes (CNTs) in 80 mL of deionized water to obtain solution A, the concentration of CNTs in solution A is 0.375 mg·mL -1 ; Add 0.6765 g SnCl to solution A 2 2H 2 O, stir evenly first, then ultrasonically treat (50W) at 40°C for 30min to obtain a uniformly dispersed solution B; then add 0.3g glucose to solution B, and stir to obtain solution C; wherein, the inner diameter of the carboxylated carbon nanotube 8-10nm, the outer diameter is 20-30nm, and the length is 10-30μm.

[0031] 2) Transfer solution C to a polytetrafluoroethylene hydrothermal kettle, control the volume filling ratio to 80%, seal the hydrothermal kettle and place it in a microwave hydrothermal reactor, and set the temperature at 10°C min -1The heating rate was increased to 150 ° C for 2 hours of hydrothermal reaction, after the reaction was completed, it was cooled to room temperature with the furnace, and then the C / SnO 2 / CNTs powder, washed three...

Embodiment 2

[0036] 1) Evenly disperse 50 mg of carboxylated carbon nanotubes (CNTs) in 80 mL of deionized water to obtain solution A, the concentration of CNTs in solution A is 0.625 mg·mL -1 ; Add 0.86 g SnCl to Solution A 4 , first stir evenly, and then obtain a uniformly dispersed solution B at 60° C. by ultrasonic treatment (80W) for 60 minutes; then add 0.5 g of glucose to solution B, and stir well to obtain solution C; wherein, the inner diameter of the carboxylated carbon nanotubes is 8-10nm, the outer diameter is 20-30nm, and the length is 10-30μm.

[0037] 2) Transfer solution C to a polytetrafluoroethylene hydrothermal kettle, control the volume filling ratio to 80%, seal the hydrothermal kettle and place it in a microwave hydrothermal reactor, and set the temperature at 10°C min -1 The heating rate was raised to 120°C for hydrothermal reaction for 5 hours. After the reaction was completed, it was cooled to room temperature with the furnace, and then the C / SnO 2 / CNTs powder, ...

Embodiment 3

[0039] 1) Evenly disperse 60 mg of carboxylated carbon nanotubes (CNTs) in 60 mL of deionized water to obtain solution A, the concentration of CNTs in solution A is 1 mg·mL -1 ; Add 1.353 g SnCl to Solution A 2 2H 2 O, stir evenly first, then ultrasonically treat (100W) at 50°C for 120min to obtain uniformly dispersed solution B; then add 0.2g fructose to solution B, and stir uniformly to obtain solution C; wherein, the inner diameter of the carboxylated carbon nanotube 8-10nm, the outer diameter is 20-30nm, and the length is 10-30μm.

[0040] 2) Transfer the solution C to a polytetrafluoroethylene hydrothermal kettle, control the volume filling ratio to 60%, seal the hydrothermal kettle and place it in a microwave hydrothermal reactor, and set the temperature at 10°C min -1 The heating rate was increased to 180 ° C for 2 hours of hydrothermal reaction, and after the reaction was completed, it was cooled to room temperature with the furnace, and then the C / SnO 2 / CNTs powde...

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Abstract

The invention relates to a preparation method of a C / SnO2 / CNT (carbon nano tube) composite material of a core shell structure for a lithium ion battery cathode. According to the method, carboxylated CNTs are uniformly dispersed in deionized water to obtain a solution A; a tin source is added into the solution A to obtain a uniformly dispersed solution B; a sugar type carbon source is added into the solution B; after the uniform stirring is performed, a solution C is obtained, wherein the mass ratio of the carboxylated CNTs to the tin source to the sugar type carbon source is (10-200mg):(0.36-3.1g):(0.1-1.5g); the solution C is transferred into a hydrothermal kettle; hydrothermal reaction is performed for 1 to 6h at the temperature being 120 to 210 DEG C; after the reaction is completed, the mixture is cooled to the room temperature; then, powder is separated out; washing and drying are performed; the C / SnO2 / CNT composite material of the core shell structure for the lithium ion battery cathode is obtained. The preparation method has the advantages that the process is simple; the preparation period is short; the repeatability is high; the reaction temperature is low; the energy consumption is low; the production cost is reduced; the preparation method is suitable for large-scale production and preparation.

Description

technical field [0001] The invention relates to a kind of SnO used for negative electrode of lithium ion battery 2 Preparation of composite materials, specifically related to a C / SnO with core-shell structure for negative electrodes of lithium-ion batteries 2 / CNT composite material preparation method. Background technique [0002] Lithium-ion batteries are widely used in mobile electronic devices (such as mobile phones, computers, cameras, etc.) and hybrid electric vehicles due to their high energy and power density. Therefore, lithium-ion batteries have become a research hotspot. At present, there are three main aspects of research on lithium-ion batteries, positive electrode materials, negative electrode materials, and electrolytes. Relatively speaking, the research on negative electrode materials is relatively slow. [0003] Currently, SnO 2 Due to the higher theoretical capacity (1493mAh g -1 ) has become a research hotspot. But SnO 2 It has a certain volume expa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/483H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 黄剑锋程娅伊李嘉胤曹丽云吴建鹏齐慧席乔郭玲
Owner SHAANXI UNIV OF SCI & TECH
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