Negative electrode active material for secondary battery, preparation method and secondary battery thereof

A negative electrode active material, secondary battery technology, applied in secondary batteries, battery electrodes, nanotechnology for materials and surface science, etc., can solve lithium-ion battery performance to be improved, low cycle stability and specific capacity, Unable to form three-dimensional multi-level structure and other problems, to achieve the effects of stable performance, improved electrical conductivity, and reduced ohmic polarization

Active Publication Date: 2013-01-09
SHANGHAI SINOPOLY JIAHUA BATTERY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, Xu et al. combined graphene oxide and SnCl 4 ·5H 2 Hydrothermal treatment of dilute hydrochloric acid solution of O can also obtain graphene composites (C.Xu, et.al., J Mater Chem, 22(2012) 975.) with sparse nanorods grown. This method has complicated steps.
And because the nanorods are relatively sparse, the structural stability of the composite is poor, resulting in low cycle stability and specific capacity of the material. After 50 cycles at a current density of 200mA / g, only a specific capacity of 574.6mAh / g is retained.
SnO prepared by these methods 2 Nanorod / graphene composites are not able to form SnO 2 Nanorod arrays are composited with graphene at the same time, and cannot form a layer-by-layer self-assembled three-dimensional multi-level structure, so the performance of its lithium-ion battery still needs to be improved

Method used

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  • Negative electrode active material for secondary battery, preparation method and secondary battery thereof
  • Negative electrode active material for secondary battery, preparation method and secondary battery thereof
  • Negative electrode active material for secondary battery, preparation method and secondary battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add 5 parts of self-made graphene oxide to a mixture containing 200 parts of urea (1 g per 100 parts), 35 parts of SnCl 4 ·5H 2 O. In the mixed aqueous solution (8000 parts) of 37 parts of thioglycolic acid and water, ultrasonic for 30 minutes, finally transfer the mixed solution into a polytetrafluoroethylene liner, put it in a steel autoclave, 180°C After 12 hours of reaction, SnO was prepared 2 Nanorod Array / Graphite Nanoflake Composite.

[0042] figure 1 is the XPS energy spectrum of the sample obtained in Example 1. Four elements of Sn, O, C, and S can be found in the full spectrum, and the Sn 3d spectrum is composed of Sn 3d with an electron binding energy of 487.7eV 5 / 2 Characteristic peaks and Sn 3d with electron binding energy of 495.8eV 3 / 2 Composition of characteristic peaks, there is no other Sn element in the spectrum (Sn 3d 5 / 2 , 485.0eV) and divalent Sn (Sn 3d 5 / 2 , 485.8eV) characteristic peak, indicating that the composite is composed of graphene...

Embodiment 2

[0044] Add 5 parts of self-made graphene to 50 parts of urea, 10 parts of SnCl 4 ·5H 2 O and 11 parts of thioglycolic acid in a mixed aqueous solution (8000 parts), ultrasonic for 30 minutes, and finally the mixed solution was transferred to a polytetrafluoroethylene liner, put into a steel autoclave, and reacted at 180 ° C for 12 SnO was produced after hours 2 Nanorod array / graphite nanoflake composite, in which SnO 2 The length of the nano rod is 50-60nm, and the weight percentage of the graphite nano sheet is 67%. The charge-discharge test was carried out at a charge-discharge current density of 200mA / g, and the reversible specific capacity was 400mAh / g after 100 cycles.

Embodiment 3

[0046] Add 5 parts of self-made graphene oxide and 5 parts of graphene to a mixture containing 200 parts of urea, 35 parts of SnCl 4 ·5H 2 O and 37 parts of thioglycolic acid in a mixed aqueous solution (8000 parts), ultrasonic for 100 minutes, and finally the mixed solution was transferred to a polytetrafluoroethylene liner, put into a steel autoclave, and reacted at 180 ° C for 12 SnO was produced after hours 2 Nanorod array / graphite nanoflake composite, in which SnO 2 The length of the nanorod is 70-80nm, and the weight percentage of the graphite nanosheet is 43%. The charge-discharge test was carried out at a charge-discharge current density of 200mA / g, and the reversible specific capacity was 860mAh / g after 100 cycles.

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Abstract

The invention relates to a negative electrode active material for a secondary battery, a preparation method and the secondary battery thereof, belonging to the technical field of batteries. The active material comprises graphite nano-thin sheets and SnO2 nanorods which are uniformly arranged between sheet layers of the graphite nano-thin sheets, wherein the mass fraction of the graphite nano-thin sheets is 5-90%, and the length of the nanorods is 30-500nm. The preparation method comprises the following steps of: adding the graphite thin sheets into a mixed water solution containing urea, SnCl4.5H2O and thioglycolic acid; performing ultrasonic processing on the obtained mixed water solution; transferring the mixed water solution after ultrasonic processing into a high-temperature and high-pressure container and reacting at certain temperature; and performing centrifugation or filtering separation on the solution after reaction, and drying to obtain an SnO2 nanorod array/graphite nano-thin sheet composite. The negative electrode active material for the secondary battery, which is prepared through the preparation method disclosed by the invention, has stable performance and can be used as the negative electrode material for a lithium ion battery, and the reversible specific capacity is high.

Description

technical field [0001] The invention relates to an electrode active material in the field of battery technology, a preparation method and a secondary battery thereof, in particular to a SnO 2 Nanorod array / graphite nanoflake composite negative electrode active material, preparation method and secondary battery thereof. Background technique [0002] Compared with lead-acid batteries, nickel-cadmium batteries, and nickel-hydrogen batteries, lithium-ion batteries have the advantages of high energy density, large specific capacity, long cycle life, and environmental friendliness. They are widely used in mobile phones, notebook computers, digital cameras, and digital video cameras. has been widely applied. At present, the performance of lithium-ion batteries can better meet the needs of small electrical appliances, but in the application of electric vehicles and energy storage devices, lithium-ion batteries still face huge challenges. Therefore, the development of high-performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/587B82Y30/00H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 宰建陶李波韩倩琰肖映林钱雪峰马紫峰
Owner SHANGHAI SINOPOLY JIAHUA BATTERY TECH
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