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Halloysite-based positive electrode material of lithium-sulfur battery and preparation method for positive electrode material

A lithium-sulfur battery and cathode material technology, which is applied in battery electrodes, lithium storage batteries, nanotechnology for materials and surface science, etc. The effect of increasing the filling rate and increasing the inner diameter

Active Publication Date: 2016-09-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a halloysite-based lithium-sulfur battery positive electrode material and its preparation method for the shuttle effect and poor cycle stability of current lithium-sulfur batteries.

Method used

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  • Halloysite-based positive electrode material of lithium-sulfur battery and preparation method for positive electrode material
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  • Halloysite-based positive electrode material of lithium-sulfur battery and preparation method for positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0030] 1) Acid etching of halloysite

[0031] Grind the natural halloysite through a 300-mesh sieve, then weigh 1g of the halloysite powder that has been crushed and sieved, add it to 100ml of 2mol / L sulfuric acid, stir at 70°C for 6h, then centrifuge, wash, and dry in vacuum Dry in an oven at 110°C for 5 hours to obtain halloysite after acid etching and drying.

[0032] 2) Preparation of halloysite / sulfur composites

[0033] Take 0.16g of acid-etched halloysite powder and add it to 2ml of deionized water, place it in a vacuum environment for degassing for 4 hours, then add 2.4ml of 10mol HCl to the halloysite suspension and let it stand for 20 minutes, then ultrasonically disperse for 15 minutes , and then the suspension was added dropwise to 300ml of 0.04mol / L Na containing 0.02wt% PVP 2 S 2 o 3 In the solution, magnetically stirred for 3 hours, filtered and washed, and dried in a vacuum oven at 60° C. for 12 hours to obtain a halloysite / S composite. Then, the halloysit...

Embodiment 2

[0037] The acid etching temperature of halloysite in Example 1 was set to: stir at 80° C. for 6 h, and the others were the same as in Example 1. Calculated by thermogravimetric analysis, the actual content of sulfur in the composite material is 59.08%, as figure 1 shown. The test results are listed in Table 1, the first discharge capacity is: 1019.4mAh•g -1 ,The specific capacity after 50 cycles is: 687.48mAh•g -1 . Such as figure 2 ,3 shows that the charging and discharging platform is normal, and the cycle performance of the battery is improved.

Embodiment 3

[0039] The acid etching temperature of halloysite in Example 1 was set to: stir at 90° C. for 6 h, and the others were the same as in Example 1. The test results are listed in Table 1, the first discharge capacity is: 1002.2mAh•g -1 , specific capacity after 50 cycles: 598.2mAh•g -1 .

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Abstract

The invention relates to a positive electrode material of a lithium-sulfur battery and a preparation method for the positive electrode material, wherein the positive electrode material takes halloysite as a sulfur carrier; the preparation method comprises the steps of enlarging the inner diameter of the tube cavity of the halloysite by acid etching; then filling the tube cavity of the halloysite with sulfur by a liquid phase chemical deposition method and a thermal processing two-step method to form a halloysite / sulfur composite material; and then preparing and obtaining the halloysite-based lithium-sulfur battery positive plate. The halloysite is large in specific surface area, high in adsorption capacity and unique in the micropore structure, so that polysulfide generated in the charging-discharging process of the lithium-sulfur battery can be limited in the tube cavity of the halloysite, the volume expansion of sulfur in the charging-discharging process is restrained, and the capacity and the cycling stability of the battery are greatly improved; in addition, the preparation process is simple; and in addition, the halloysite nanotube is a natural environment-friendly material, low in cost and easily available, so that the industrial production of the lithium-sulfur battery can be realized conveniently.

Description

technical field [0001] The invention belongs to the field of new energy, and in particular relates to a novel halloysite-based positive electrode material for a lithium-sulfur secondary battery and a preparation method thereof. Background technique [0002] With the rapid increase of fossil energy consumption, the energy crisis and environmental problems continue to intensify, and portable electronic products and emerging electric vehicles have higher and higher energy density requirements for secondary batteries. The development of high energy density, long cycle life, low Low cost, green and pollution-free secondary batteries have become a hot research topic. [0003] The theoretical energy density of a lithium-sulfur battery with elemental sulfur as the positive electrode and metal lithium as the negative electrode is as high as 2600Wh / kg. It is currently known as the lithium secondary battery system with the highest energy density except lithium-air batteries. The theor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/38H01M4/628H01M10/052Y02E60/10
Inventor 田艳红张勇张学军
Owner BEIJING UNIV OF CHEM TECH
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