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Lithium-sulfur battery positive electrode material and preparation method thereof

A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, lithium batteries, sulfur preparation/purification, etc., can solve the problems of obvious shuttle effect, poor cycle stability, poor conductivity, etc., to simplify the preparation process and prevent agglomeration , Improve the effect of poor electrical conductivity

Active Publication Date: 2020-07-03
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The object of the present invention is to provide a lithium-sulfur battery positive electrode material and a preparation method thereof for the existing lithium-sulfur battery positive electrode materials with low sulfur loading, poor electrical conductivity, obvious shuttle effect, and poor cycle stability. Obtain higher specific capacity at high current density and have good cycle life

Method used

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  • Lithium-sulfur battery positive electrode material and preparation method thereof

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Embodiment 1

[0031] The anode material of the lithium-sulfur battery is a cobalt tetraoxide double-layer hollow sphere-carbon nanotube-sulfur composite material.

[0032] The cobalt tetraoxide double-layer hollow sphere is composed of two inner and outer hollow spheres, the diameter of the inner hollow sphere is 400-500 nm, and the diameter of the outer hollow sphere is 1.2-1.6 μm. The obtained cobalt tetraoxide double-layer hollow microspheres have good size uniformity, rough shell surface, are composed of uniform nanoparticles, have abundant pores, provide abundant ion transfer channels, and are beneficial to the entry of electrolyte as an electrode material. A larger internal cavity between shells favors greater sulfur loading.

[0033] The preparation method of the positive electrode material of the lithium-sulfur battery comprises the following steps:

[0034] (1) Preparation of three-cobalt tetroxide double-layer hollow spheres: after dissolving 15g of glucose and 8g of cobalt nitra...

Embodiment 2

[0037] The preparation method of the positive electrode material of the lithium-sulfur battery comprises the following steps:

[0038] (1) Preparation of three-cobalt tetroxide double-layer hollow spheres: after dissolving 10g of glucose and 5g of cobalt nitrate in 100mL of deionized water, they were placed in a reaction kettle for hydrothermal reaction at 150°C for 12 hours. After the reaction was completed, the suspension was obtained by cooling at room temperature liquid; the resulting suspension was centrifuged, the product was collected and washed three times with deionized water, and dried at 60°C to obtain a powder; then the obtained powder was placed in a muffle furnace and heated at a rate of 1°C / min under air conditions Raise the temperature to 400°C, keep it warm for 1 hour, and then cool down at room temperature to obtain the powder of cobalt tetraoxide double-layer hollow spheres;

[0039] (2) Cobalt tetraoxide double-layer hollow sphere-carbon nanotube-sulfur com...

Embodiment 3

[0041] The preparation method of the positive electrode material of the lithium-sulfur battery comprises the following steps:

[0042] (1) Preparation of three-cobalt tetroxide double-layer hollow spheres: after dissolving 20g of glucose and 10g of cobalt nitrate in 200mL of deionized water, they were placed in a reaction kettle for hydrothermal reaction at 200°C for 24 hours. After the reaction was completed, the suspension was obtained by cooling at room temperature liquid; the resulting suspension was centrifuged, the product was collected and washed three times with deionized water, and dried at 60°C to obtain a powder; then the obtained powder was placed in a muffle furnace and heated at a rate of 5°C / min under air conditions Raise the temperature to 600°C, keep it warm for 2 hours, and then cool down with room temperature to obtain the powder of three-cobalt tetroxide double-layer hollow spheres;

[0043] (2) Cobalt tetraoxide double-layer hollow sphere-carbon nanotube-s...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a lithium-sulfur battery positive electrode material and a preparation method thereof. The positive electrode material is a tricobalt tetraoxide double-layer hollow sphere-carbon nanotube-sulfur composite material, achieves high specific capacity under high current density and has good cycle life.According to the preparation method, tricobalt tetraoxide double-layer hollow spheres are coated with carbon nanotubes in a spray drying mode, so that the optimal coating effect can be achieved whilethe conductivity of the material is improved, the structural stability of the tricobalt tetraoxide spheres is enhanced through the coating support of the carbon nanotubes, and the material has the optimal adsorption effect.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] Lithium-sulfur battery is a kind of lithium battery with sulfur element as the positive electrode and metal lithium as the negative electrode. Its specific capacity is as high as 1675mAh / g, which is much higher than the capacity of lithium cobalt oxide batteries (<150mAh / g) widely used in commerce. In theory, lithium-sulfur batteries of the same weight can provide electric vehicles with three times the battery life of ordinary lithium-ion batteries. In addition, sulfur is a non-polluting, environmentally friendly element, abundant in reserves, light in weight and cheap, and is a promising material for lithium-sulfur batteries. [0003] The charging and discharging principle of lithium-sulfur battery is as follows: when discharging, the negativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/38H01M4/62H01M10/052C01G51/04C01B32/168C01B17/02B82Y30/00B82Y40/00
CPCH01M4/366H01M4/523H01M4/38H01M4/625H01M10/052C01G51/04C01B32/168C01B17/0248B82Y30/00B82Y40/00Y02E60/10
Inventor 张永光王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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