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Composite martial for lithium battery and button battery prepared from composite martial

A composite material, button battery technology, applied in nanotechnology for materials and surface science, battery electrodes, lithium batteries, etc. problem, to achieve the effect of improving lithium storage capacity and good electrochemical performance

Inactive Publication Date: 2015-05-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the low degree of carbon conjugation of the coating layer prepared by such molecules, the formation of SnO 2 The limited dispersion of nanoparticles limits the further improvement of composite properties

Method used

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  • Composite martial for lithium battery and button battery prepared from composite martial
  • Composite martial for lithium battery and button battery prepared from composite martial
  • Composite martial for lithium battery and button battery prepared from composite martial

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Embodiment 1

[0030] Graphite oxide (GO) was prepared by improved Hummers’, and 120 mg of graphite oxide was dissolved in distilled water, and ultrasonically dispersed (700 W, 2 h) to obtain a graphite oxide solution (1 mg·mL -1 ), denoted as solution A. Weigh 5g dicyandiamide, 504mg thiourea, 240mg SnCl 2 2H 2 O was dissolved in solution A completely under stirring at room temperature; the mixed solution was transferred to a hydrothermal kettle and heated at 150°C for 12 hours, and naturally cooled to room temperature after the reaction was completed. The hydrothermal reaction product was washed several times with distilled water and then dried at 70 °C. After drying, the sample was calcined at 500 °C for 2 h under a nitrogen atmosphere to obtain SnO 2 -S / N-GNs composites. Using the same method as above, prepare respectively without adding dicyandiamide or thiourea or SnCl 2 2H 2 Composites of O and thiourea, labeled as SnO 2 / GNs, SnO 2 / N-GNs, N-GNs.

[0031] Analysis and charact...

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Abstract

The invention relates to a composite martial for a lithium battery. The composite martial is prepared by carrying out nitrogen doping on graphite oxide by taking dicyandiamide as a modifying agent, and in the nitrogen doping process, urea compounds and SnCl2.2H2O are added. The composite martial has the beneficial effects that an SnO20-S / N-GNs composite material with high nitrogen content is controllably prepared by virtue of a one-step hydrothermal method and presents good electrochemical properties when being applied to a negative electrode of a lithium ion battery; SnO2 particles have nanoscale dispersity, and the surfaces of the SnO2 particles can be subjected to cross-linked polymerization with N-doped graphene; by virtue of introduction of dicyandiamide, the electrical conductivity of graphite oxide is improved, and meanwhile, more reaction active sites are provided to react with SnO2 nanocrystalline, so that SnO2 nano-particles are uniformly dispersed in an N-doped graphene slice layer; by adding thiourea, the average grain diameters of the SnO2 nano-particles are beneficially controlled, and the lithium storage capacity of the material is further improved.

Description

technical field [0001] The invention relates to the preparation of composite materials, in particular to a composite material for lithium batteries and button batteries prepared therefrom. Background technique [0002] Lithium-ion batteries are widely used in mobile communication equipment, portable electronic equipment and electric / hybrid vehicles because of their advantages such as high working voltage, high energy density, long cycle life and no pollution to the environment. Compared with traditional graphite-based negative electrode materials, transition metal oxides are favored due to their higher theoretical specific capacity and good electrochemical reactivity, especially SnO 2 Negative electrode material (theoretical capacity 782mAhg -1 ). However, with lithium ion intercalation / extraction during charge and discharge, SnO 2 Larger volume expansion (about 300%) easily destroys the electrode and leads to rapid capacity decay. in SnO 2 Adding or coating buffer mate...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M10/052
CPCB82Y30/00H01M4/366H01M4/483H01M4/625H01M10/0525Y02E60/10
Inventor 李忠涛邓深圳吴桂良吴文婷吴明铂
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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