Method for preparing lithium-sulfur battery cathode material

A technology for cathode materials and lithium-sulfur batteries, applied in the field of electrodes, can solve the problems of poor conductivity of cathode materials, low utilization rate of active materials, shuttle effect, etc., and achieve the goal of increasing sulfur loading, stabilizing the production process, and inhibiting the shuttle effect Effect

Active Publication Date: 2019-08-30
HEBEI UNIV OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing the positive electrode material of lithium-sulfur battery, which is to firstly prepare the polymetallic imidazole-type molecular sieve framework TiO grown inside the three-dimensional ordered titanium dioxide framework. 2 -Co-ZIF-8, followed by in situ growth to obtain porous nitrogen-doped carbon-wrapped cobalt nanoparticles TiO in which carbon nanotubes are supported in series on a three-dimensional ordered titania framework 2 -CNT-Co@NC, the nanoparticles are compounded with sublimed sulfur powder to obtain S / TiO 2 - The method of CNT-Co@NC lithium-sulfur battery cathode material overcomes the defects of low utilization rate of active material, poor conductivity of cathode material and shuttle effect in the cathode material of lithium-sulfur battery prepared in the prior art

Method used

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  • Method for preparing lithium-sulfur battery cathode material
  • Method for preparing lithium-sulfur battery cathode material
  • Method for preparing lithium-sulfur battery cathode material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0039] The first step, the preparation of polystyrene pellets:

[0040] Preparation of polystyrene pellets by emulsion polymerization;

[0041] figure 1 It is a scanning electron micrograph of the polystyrene pellets prepared in this example. The figure shows that the polystyrene spheres are arranged in a three-dimensional order and uniformly, and the diameter of the spheres is about 100nm.

[0042] The second step, the preparation of three-dimensional ordered titania framework:

[0043] First add sulfuric acid with a mass percent concentration of 3% into anhydrous methanol, then add tetrabutyl titanate to prepare a solution, and the amounts of the three are anhydrous methanol: tetrabutyl titanate: mass percent concentration is 3% sulfuric acid = 5: 5: 1, the solution thus prepared is dripped with the polystyrene pellets prepared in the first step to 3 mL: 1 mg, and the solution is soaked in a ratio of 1 mg. Use a mechanical pump to vacuum filter the filter flask to a vacu...

Embodiment 2

[0055] The first step, the preparation of polystyrene pellets:

[0056] Preparation of polystyrene pellets by emulsion polymerization;

[0057] The second step, the preparation of three-dimensional ordered titania framework:

[0058]First add sulfuric acid with a mass percent concentration of 3% into anhydrous methanol, then add tetrabutyl titanate to prepare a solution, and the amounts of the three are anhydrous methanol: tetrabutyl titanate: mass percent concentration is 3% sulfuric acid = 4: 4: 1, the solution thus prepared is dripped with the polystyrene pellets prepared in the first step to 1 mL: 1 mg for solution impregnation operation, the specific method is, in a fume hood Use a mechanical pump to vacuum filter the filter bottle to a vacuum degree of -0.08MPa, add the solution thus prepared dropwise to the polystyrene pellets prepared in the first step above, and add dropwise while suction filtering, dropwise The acceleration rate is 3 drops / second. The polystyrene p...

Embodiment 3

[0066] The first step, the preparation of polystyrene pellets:

[0067] Preparation of polystyrene pellets by emulsion polymerization;

[0068] The second step, the preparation of three-dimensional ordered titania framework:

[0069] First add sulfuric acid with a mass percent concentration of 3% into anhydrous methanol, then add tetrabutyl titanate to prepare a solution, and the amounts of the three are anhydrous methanol: tetrabutyl titanate: mass percent concentration is 3% sulfuric acid = 6: 6: 1, the solution thus prepared is dripped with the polystyrene pellets prepared in the first step to 2 mL: 1 mg for solution impregnation operation, the specific method is, in a fume hood Use a mechanical pump to vacuum filter the filter flask to a vacuum degree of -0.09MPa, add the solution thus prepared dropwise to the polystyrene pellets prepared in the first step above, and add dropwise while suction filtering, dropwise The acceleration rate is 1 drop / second. The polystyrene pe...

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Abstract

The invention relates to a method for preparing a lithium-sulfur battery cathode material, which relates to an electrode consisting of active materials. The method comprises the following steps of: firstly, preparing a multi-metal imidazole type molecular sieve framework TiO2-Co-ZIF-8 growing in a three-dimensional ordered titanium dioxide framework, then obtaining cobalt nano-particles TiO2-CNT-Co@NC coated with porous N-doped carbon and serially loaded on the three-dimensional ordered titanium dioxide framework through in-situ growth, and compounding the nano-particles and the with sublimedsulfur powder to obtain the S / TiO2-CNT-Co@NC lithium-sulfur battery cathode material. The method for preparing a lithium-sulfur battery cathode material overcomes the defects of low utilization rate of active substances, poor conductivity and shuttle effect in the prepared cathode material of the lithium-sulfur battery in the prior art.

Description

technical field [0001] The technical solution of the invention relates to an electrode composed of active materials, in particular to a preparation method of a cathode material for a lithium-sulfur battery. Background technique [0002] With the rapid development of society and the rapid growth of economic level, people's demand for energy also increases steadily. Lithium-ion battery is currently the most widely used battery type, with the advantages of high energy density, low self-discharge rate and long service life, so it has broad application prospects. Although the current specific capacity of lithium-ion batteries is close to its theoretical specific capacity of 300mAh g -1 , but still cannot meet the growing energy demand of human production and life, especially with the popularization of portable electronic devices, mobile power sources and new energy vehicles, the relatively low energy density of lithium-ion batteries cannot meet the needs of large-scale energy st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/583H01M10/052
CPCH01M4/366H01M4/38H01M4/48H01M4/583H01M10/052H01M2004/028Y02E60/10
Inventor 李海鹏李超杰孙雪宇王加义戴西斌赵利新
Owner HEBEI UNIV OF TECH
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