Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of lithium-sulfur battery composite positive electrode material and its preparation method and battery

A composite cathode material, battery technology, applied in battery electrodes, lithium batteries, positive electrodes, etc., can solve the problems of reduction, polysulfide shuttle effect, slow conversion rate, etc., to improve conductivity, inhibit shuttle effect, and improve conversion. effect of speed

Active Publication Date: 2022-05-10
GUANGDONG UNIV OF TECH
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a battery composite positive electrode material and its preparation method and battery, which are used to solve the problems of slow conversion rate and polysulfide shuttle effect of existing lithium-sulfur battery positive electrode materials.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of lithium-sulfur battery composite positive electrode material and its preparation method and battery
  • A kind of lithium-sulfur battery composite positive electrode material and its preparation method and battery
  • A kind of lithium-sulfur battery composite positive electrode material and its preparation method and battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0067] The present invention also provides a preparation method of battery composite cathode material, comprising the following steps:

[0068] a) depositing metal hydroxide and / or metal oxide 2 on the surface of the microsphere 4 to obtain a composite microsphere 6 with metal hydroxide and / or metal oxide 2 deposited on the surface;

[0069] b) coating the polymer on the surface of the composite microsphere 6, and then performing carbonization treatment to carbonize the polymer to obtain a carbon-coated composite microsphere 8;

[0070] c) Etching the carbon-coated composite microsphere 8 to remove the microsphere 4 to obtain a metal-carbon shell 9, and then load elemental sulfur in the metal-carbon shell 9, and the elemental sulfur is formed in the metal-carbon shell 9 Sulfur core 1, to obtain a battery composite positive electrode material.

[0071] In the embodiment of the present invention, step a) preferably disperses the microspheres 4 in the metal salt solution, hydrol...

Embodiment 1

[0097] This embodiment carries out the preparation of battery composite positive electrode material, comprises the following steps:

[0098]1) Measure 20mL of deionized water, 70mL of absolute ethanol and 5mL of 30wt% ammonia water respectively, add them to the beaker in sequence, stir evenly with a magnetic stirrer at room temperature, weigh 1.0g of tetraethyl orthosilicate (TEOS) and slowly add it dropwise to In the uniformly mixed solution, seal the mouth of the beaker with a polyethylene film after the dropwise addition, and stir continuously at room temperature for 6 hours to complete the reaction, and then centrifugally wash to obtain SiO with different diameters. 2 Microspheres, SiO 2 The diameter of the microsphere is 100nm-300nm.

[0099] 2) Weigh 1.0g FeCl 3 Add it into deionized water and stir at room temperature to form metal salt solution A. Weigh another 1.3g SiO 2 The microspheres were dissolved in deionized water to obtain Solution B. Add solution B dropwi...

Embodiment 2

[0103] This embodiment carries out the preparation of battery composite positive electrode material, comprises the following steps:

[0104] 1) Measure 20mL of deionized water, 70mL of absolute ethanol and 5mL of 30wt% ammonia water respectively, add them to the beaker in sequence, stir evenly with a magnetic stirrer at room temperature, weigh 1.0g of tetraethyl orthosilicate (TEOS) and slowly add it dropwise to In the uniformly mixed solution, seal the mouth of the beaker with a polyethylene film after the dropwise addition, and stir continuously at room temperature for 6 hours to complete the reaction, and then centrifugally wash to obtain SiO with different diameters. 2 Microspheres, SiO 2 The diameter of the microsphere is 100nm-300nm.

[0105] 2) Weigh 1.2g Co(NO 3 ) 3 Add it into deionized water and stir at room temperature to form metal salt solution A. Weigh another 1.4g SiO 2 The microspheres were dissolved in deionized water to obtain Solution B. Add solution B...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
thicknessaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of lithium-sulfur battery cathode materials, and in particular relates to a lithium-sulfur battery composite cathode material, a preparation method thereof and a battery. The invention provides a battery composite positive electrode material, the battery composite positive electrode material has a core-shell structure; the core-shell structure includes a metal-carbon shell and a sulfur core arranged in the metal-carbon shell; the metal-carbon shell is composed of metal hydroxide and / or Or metal oxide and carbon are formed, metal hydroxide and / or metal oxide are coated in carbon; sulfur core is formed by elemental sulfur. The battery composite positive electrode material of the present invention has a core-shell structure, and the metal-carbon shell can improve the electrical conductivity of the battery composite positive electrode material and can play a confinement effect on sulfur and intermediate product polysulfides, metal hydroxide and / or metal oxide It can not only adsorb polysulfides through the "lithophilic" or "sulfophilic" effect, inhibit the shuttle effect, provide sulfur evolution sites, but also catalyze the conversion of sulfur and polysulfides, improve the kinetics of the electrode process, and increase the conversion rate of the electrode.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur battery cathode materials, and in particular relates to a lithium-sulfur battery composite cathode material, a preparation method thereof and a battery. Background technique [0002] Lithium-sulfur batteries are becoming more and more valuable for research because of their high theoretical energy density (2600Wh / kg) and high theoretical specific capacity (1675mAh / g), and sulfur has many advantages, such as abundant reserves on the earth, With non-toxicity and environmental friendliness, lithium-sulfur batteries are most promising to be the next generation high specific energy secondary battery system. [0003] However, there are some problems in lithium-sulfur batteries that hinder its wide practical application, such as: the low conductivity of sulfur and discharge products makes it difficult to develop the capacity; the intermediate polysulfides are easily dissolved in the electrolyte, re...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/626H01M4/628H01M10/052H01M2004/028H01M2004/021Y02E60/10
Inventor 刘全兵李栋南皓雄谢盈基郑育英方岩雄
Owner GUANGDONG UNIV OF TECH