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Sn-C composite material with high N content of lithium battery cathode and preparation method of Sn-C composite material

A technology of composite materials and lithium batteries, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of low conductivity of coated carbon, limited capacity retention capacity, and complicated methods of carbon coating materials, so as to improve conductivity, The effect of good electrochemical performance

Inactive Publication Date: 2015-12-02
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

However, current carbon-coated materials still have limited capacity retention due to their relatively inhomogeneous nanoparticles and low electrical conductivity of the coated carbon.
Moreover, some previous methods for preparing carbon-coated materials are relatively complicated

Method used

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  • Sn-C composite material with high N content of lithium battery cathode and preparation method of Sn-C composite material
  • Sn-C composite material with high N content of lithium battery cathode and preparation method of Sn-C composite material
  • Sn-C composite material with high N content of lithium battery cathode and preparation method of Sn-C composite material

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Embodiment 1

[0031] Firstly, graphite oxide was synthesized by optimized Hummers method using graphite powder. 200 mg of graphite oxide was ultrasonically dispersed in 200 ml of distilled water for 2 hours to form a graphene oxide solution, and the obtained solution was marked as solution A. Heat solution A to 45° C., slowly add 0.80 g of diaminomaleonitrile under stirring to fully dissolve it, and the obtained solution is designated as solution B. With stirring, 1.20g of SnCl 4 ·5H 2 O is dissolved in solution B above. Then, the mixed liquid was transferred to a hydrothermal kettle, and hydrothermally heated at 150° C. for 12 hours. After the reaction, it was cooled to room temperature naturally. The obtained product was centrifuged and washed several times, and the product was dried at 70°C. Finally, in high-purity N 2 SnO can be obtained by calcining at 500°C for 2 hours in a tube furnace under atmosphere. 2 / C x N y / GN composites. Using the same method as above, the composit...

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Abstract

The invention relates to a composite material of a lithium battery cathode. The composite material is prepared according to a method taking DAMN as a modifier during N doping of graphite oxide. SnCl4.5H2O is added in the N doping process, and a composite structure of carbon nitride and tin oxide is formed through high-temperature carbonization. The invention further provides a SnO2 / CxNy / GN composite material which is controllably prepared according to a one-step hydro thermal method and high in N content. The SnO2 / CxNy / GN composite material is high in electrochemical property while being used for preparing the lithium battery cathode; due to nano-dispersion of SnO2 particles, cross-linking polymerization between the surfaces of the SnO2 particles and N-doped graphene, and introduction of DAMN, not only is the conductibility of graphite oxide improved, but also more reaction active sites are provided for reaction with SnO2 nanocrystalline, and the SnO2 nano-particles are stably and uniformly dispersed in a lamella of carbon nitride and graphene.

Description

technical field [0001] The invention relates to the preparation of composite materials, in particular to a composite material used for lithium battery negative electrodes. Background technique [0002] Lithium-ion batteries are widely used in various electronic products due to their advantages such as high cell voltage, high energy density, long cycle life, safety and environmental protection. The performance of lithium-ion batteries mainly depends on the performance of positive and negative electrode materials. Therefore, the improvement of the performance of lithium-ion batteries mainly depends on the improvement of the performance of positive and negative electrode materials. [0003] The anode material of the current commercialized lithium-ion battery is graphite-based anode material. However, graphite-based anode materials have low capacity and voltage hysteresis, which can no longer meet people's needs. However, transition metal oxides have high theoretical specific...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/48H01M4/139
CPCH01M4/139H01M4/362H01M4/48H01M4/5835Y02E60/10
Inventor 李忠涛邓深圳王书敬王元坤吴明铂
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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