Lithium-sulfur battery positive electrode material containing three-dimensional interpenetrating composite carbon material, preparation method, positive electrode sheet containing same, and lithium-sulfur battery

A technology for lithium-sulfur batteries and positive electrode materials, applied in battery electrodes, lithium batteries, electrode manufacturing, etc., to achieve high utilization and reduce the proportion of micropores

Active Publication Date: 2020-09-25
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite carbon material containing three-dimensional interpenetration is used as a sulfur-carrying matrix in the positive electrode of lithium-sulfur batteries to overcome the problems of poor conductivity, volume expansion and shuttle effect of polysulfide lithium in the charge and discharge process of elemental sulfur, so as to realize lithium-sulfur batteries. Sulfur batteries have excellent cycle performance and rate performance, high Coulombic efficiency, and long-term cycle performance at high current densities

Method used

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  • Lithium-sulfur battery positive electrode material containing three-dimensional interpenetrating composite carbon material, preparation method, positive electrode sheet containing same, and lithium-sulfur battery
  • Lithium-sulfur battery positive electrode material containing three-dimensional interpenetrating composite carbon material, preparation method, positive electrode sheet containing same, and lithium-sulfur battery
  • Lithium-sulfur battery positive electrode material containing three-dimensional interpenetrating composite carbon material, preparation method, positive electrode sheet containing same, and lithium-sulfur battery

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Embodiment 1

[0047] A preparation method of a lithium-sulfur battery cathode active material, comprising the following steps:

[0048] (1) Using multi-armed carbon nanotubes (after activation treatment) with an average diameter of 20nm as a three-dimensional framework, ZIF-67 was produced in situ on the surface of multi-armed carbon nanotubes to obtain a CNTs / ZIF-67 precursor;

[0049] Take 0.3g of multi-armed carbon nanotubes and evenly disperse them in 100ml of a mixed solution of deionized water and concentrated nitric acid with a volume ratio of 3:1, sonicate until the carbon nanotubes are evenly dispersed, then place them in a constant temperature water bath, and place them under magnetic force at 80°C Stirring treatment for 6 hours, followed by repeated washing with deionized water and absolute ethanol and centrifugation, and drying in a vacuum oven at 60°C for more than 12 hours to obtain activated multi-armed carbon nanotubes;

[0050] Place the above activated carbon nanotubes in ...

Embodiment 2

[0060] A lithium-sulfur battery, the positive electrode active material of the lithium-sulfur battery adopts the positive electrode active material of the lithium-sulfur battery described in Example 1.

[0061] Please refer to Figure 3 to Figure 4 , the present embodiment provides a lithium-sulfur battery preparation method, comprising the following steps:

[0062] (1) Preparation of positive pole piece. Weigh the lithium-sulfur cathode active material, superconducting carbon, and binder LA133 described in Example 1 according to a mass ratio of 80:10:10 and place them in an agate ball mill jar, and weigh LA133 and deionized water at a mass ratio of 1:30. Take deionized water and add it to the ball mill tank, high-energy ball mill at 400rpm for 30min, then evenly coat the obtained slurry on the aluminum foil, and control the surface density to an average of 1.85mg / cm 2 , put the pole pieces obtained above in a vacuum drying oven, dry them in vacuum at 55°C for 24 hours, and ...

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Abstract

The invention discloses a lithium-sulfur battery positive electrode material containing a three-dimensional interpenetrating composite carbon material and a preparation method thereof, a positive electrode plate containing the lithium-sulfur battery positive electrode material, and a lithium-sulfur battery. The composite carbon material has a three-dimensional interpenetrating network structure and is formed from carbon nanotubes and ZIF-67 derived hierarchical porous carbon polyhedrons by interpenetrating. ZIF-67 is grown on the surface of activated carbon nanotubes used as a framework, and the ZIF-67 is carbonized into hierarchical porous carbon polyhedrons through high-temperature sintering. The preparation method of the lithium-sulfur battery positive electrode active material comprises the following steps: weighing the composite carbon material and elemental sulfur according to a mass ratio of 1: 4; uniformly dispersing the composite carbon material and the elemental sulfur in a CS2 solution; carrying out stirring until the solvent is completely volatilized; and infiltrating the elemental sulfur in the mixture into a carbon structure by using a melting method. The positive electrode plate is composed of the positive electrode active material, superconducting carbon and a binder in a mass ratio of 8: 1: 1. The lithium-sulfur battery is mainly composed of the positive electrode plate, a diaphragm, an electrolyte and a lithium metal negative electrode.

Description

technical field [0001] The invention belongs to the technical field of preparation of carbon materials and lithium-sulfur batteries, and relates to a lithium-sulfur battery cathode material containing a three-dimensional interpenetrating composite carbon material, a preparation method thereof, a cathode pole piece containing the same, and a lithium-sulfur battery. Specifically, it relates to a ZIF-67 derived three-dimensional interpenetrating network carbon material, a lithium-sulfur battery positive electrode material and a preparation method thereof, and a positive electrode sheet and a lithium-sulfur battery made of the lithium-sulfur battery positive electrode active material. Background technique [0002] At present, the actual energy density of commercial lithium-ion batteries is low, which is difficult to meet the demand for high energy density of high-end electronic equipment and electric vehicles in society. Therefore, it is imperative to develop a new type of high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/04H01M4/13H01M4/139H01M10/052
CPCH01M4/0404H01M4/13H01M4/139H01M4/362H01M4/38H01M4/62H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 郑春满罗世强刘双科洪晓斌王丹琴李宇杰陈宇方王珲
Owner NAT UNIV OF DEFENSE TECH
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