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Composite positive electrode for secondary battery based on vertically-oriented graphene

A composite positive electrode, vertically oriented technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, batteries, etc., can solve the problems of low conductivity of sulfurized polyacrylonitrile, low utilization rate of sulfur positive electrode active material, low degree of cyclization, etc. Achieve the effect of low cost, inhibition of sulfur dissolution, and high energy density

Inactive Publication Date: 2015-01-07
NANJING ZHONGCHU NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low degree of cyclization of the above-mentioned preparation of sulfurized polyacrylonitrile, the formed conjugated π bonds that play a conductive role are less, so that the conductivity of the sulfurized polyacrylonitrile is low, resulting in the utilization of the sulfur cathode active material. Low

Method used

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  • Composite positive electrode for secondary battery based on vertically-oriented graphene

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Embodiment 1

[0043] A 30 μm thick nickel current collector is placed in the quartz glass tube of a tubular resistance furnace, and a 1000 sccm mixture of argon and hydrogen is introduced, where the volume ratio of hydrogen is 1%, and the temperature is raised to 650 ° C at the same time; the voltage is adjusted to 10 kV, Generate a stable glow plasma to remove impurities on the surface of the substrate. After 10 minutes, feed 150 sccm methane and 1350 sccm argon, and feed water vapor at the same time, control the relative humidity at 40%, then stop feeding the mixed gas of argon and hydrogen, and react for 20 min After the end, the temperature is lowered to room temperature in a reducing atmosphere to prepare vertically oriented graphene.

Embodiment 2

[0045] Use a stainless steel substrate, attach iron powder to its surface, place it in a chemical vapor deposition chamber, and seal it; apply a magnetic field in the vertical direction of the substrate, the magnetic field strength is 0.01T, and feed 50 sccm argon for 30 minutes to remove oxygen in the reaction chamber and heat the substrate to 700°C, then feed 100 sccm of methane and keep it for 1 hour. After the reaction, stop heating, turn off the methane, cool to room temperature under the protection of argon, take out the product, wash it with 1mol / L hydrochloric acid, and dry it to obtain vertically oriented graphene.

Embodiment 3

[0047] Configure a mixed solution of dimethyl sulfoxide and water (mass ratio 1:1), add 20wt% acrylonitrile, ammonium persulfate initiator, place 1wt% carbon nanotube arrays in it, keep stirring under nitrogen protection and Raise the temperature to 50°C, keep it warm for 5 hours, take out the product, wash and dry to make a vertically oriented graphene-polyacrylonitrile composite material.

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Abstract

The invention discloses a composite positive electrode for a secondary aluminum battery. The positive electrode is formed by compositing vertically-oriented graphene, polyacrylonitrile and sulfur, wherein the oriented graphene vertically grows on a conductive substrate material to form a three-dimensional conductive framework; the polyacrylonitrile uniformly coats the surface of the conductive framework; an active substance namely the sulfur is loaded finally. The specific surface area of the composite positive electrode is large, the conductive performance is excellent, the energy density is high, and the preparation process is simple, and suitable for industrial production; the secondary aluminum battery prepared from the composite positive electrode has higher specific capacity and excellent cycle performance.

Description

technical field [0001] The invention belongs to the field of battery material science, and relates to a composite positive electrode for a secondary aluminum battery and its preparation, in particular to a vertically oriented graphene / polyacrylonitrile / sulfur composite positive electrode. Background technique [0002] With the rapid development of mobile electronic and communication devices, the demand for secondary batteries is more urgent, and more and more tends to develop dense, thin, small, light and high energy density batteries. The theoretical volume specific capacity of aluminum is 8050mAh / cm 3 , is 4 times that of lithium, and the chemical activity is stable, it is an ideal negative electrode material, and the theoretical volume specific capacity of sulfur is 3467mAh / cm 3 , is one of the positive electrode materials with the highest known energy density. Aluminum-sulfur batteries are representative of secondary batteries that meet the above requirements due to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139
CPCH01M4/13H01M4/139H01M2220/30Y02E60/10
Inventor 赵宇光钟毓娟
Owner NANJING ZHONGCHU NEW ENERGY
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