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Lithiated halloysite lithium-sulfur battery positive electrode material and preparation method thereof

A technology of halloysite lithium and positive electrode materials, applied in battery electrodes, lithium batteries, chemical instruments and methods, etc., can solve the problems of poor cycle stability, poor rate performance, slow electrochemical reaction kinetics, etc., and achieve simple process , low cost effect

Active Publication Date: 2020-11-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a lithiated halloysite lithium-sulfur battery positive electrode material and a preparation method thereof, the purpose of which is to solve the slow electrochemical reaction kinetics and shuttle effect in the current lithium-sulfur battery, which lead to poor rate performance and poor cycle stability. question

Method used

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  • Lithiated halloysite lithium-sulfur battery positive electrode material and preparation method thereof
  • Lithiated halloysite lithium-sulfur battery positive electrode material and preparation method thereof
  • Lithiated halloysite lithium-sulfur battery positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] (1) Impurity removal of natural halloysite:

[0042]First, the natural halloysite was washed and floated, and 30 g of halloysite was put into 2000 ml of deionized water, and magnetically stirred at room temperature for 24 hours at a stirring speed of 800 rpm. Take the milky white powder suspended in the middle, dry it in the air for 12 hours after suction filtration, and then sieve it with a 200-mesh sieve to obtain halloysite after removal of impurities.

[0043] (2) Lithiation:

[0044] Take 0.2 g of the sample obtained in the above step (1), put it into 30 ml of LiOH solution with a concentration of 0.5 M, stir at room temperature for 1 h, then suction filter, wash with ethanol several times, and freeze-dry the obtained solid for 24 h to obtain The sample is denoted as A0, see figure 1 X-ray diffraction patterns and figure 2 (a) TEM image, figure 1 The characteristic peak of the A0 sample corresponds to halloysite (the standard card is PDF#09-0453), and also con...

Embodiment 2

[0051] (1) Impurity removal of natural halloysite:

[0052] Step is consistent with embodiment 1;

[0053] (2) Acid etching:

[0054] Get above-mentioned halloysite 1g after impurity removal, add in the sulfuric acid of 100ml, the sulfuric acid concentration is 2M. Stir for 3 hours under heating at 90 degrees, then suction filter, wash repeatedly with deionized water and absolute ethanol until neutral, and dry in a vacuum oven at 60 degrees for 12 hours.

[0055] (3) Lithiation:

[0056] Take 0.2 g of the sample obtained in the above step (2), put it into 30 ml of LiOH solution with a concentration of 1 M, stir at room temperature for 3 h, then suction filter, wash with ethanol several times, and freeze-dry the obtained solid for 24 h to obtain The sample is marked as A3.

[0057] (4) Sulfur loading:

[0058] The steps are the same as in Example 1, and the obtained lithiated halloysite sulfur-loaded material is designated as A3-S.

[0059] (5) Electrochemical test:

[0...

Embodiment 3

[0066] (1) Impurity removal of natural halloysite:

[0067] Step is consistent with embodiment 1;

[0068] (2) Acid etching:

[0069] Get above-mentioned halloysite 1g after impurity removal, add in the sulfuric acid in 100ml, the sulfuric acid concentration is 2M. Stir under heating at 90 degrees for 5 hours, then filter with suction, wash repeatedly with deionized water and absolute ethanol until neutral, and dry in a vacuum oven at 60 degrees for 12 hours.

[0070] (3) Lithiation:

[0071] Take 0.2 g of the sample obtained in the above step (2), put it into a solution of 30 ml of LiOH with a concentration of 2 M, stir at room temperature for 5 h, then filter with suction, wash with ethanol several times, and freeze-dry the obtained solid for 24 h to obtain The sample is marked as A5, see figure 1 In the X-ray diffraction pattern, the characteristic peaks of the A5 sample correspond to halloysite, and also contain some SiO 2 , after acid etching and lithiation, the stru...

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Abstract

The invention provides a lithiated halloysite lithium-sulfur battery positive electrode material, which is obtained by taking halloysite as a raw material and carrying out lithiation and sulfur loading, the length of the halloysite in the positive electrode material is 0.05-2 microns, the outer diameter of the halloysite is 30-100nm, and the thickness of the tube wall is 6-25nm; the sulfur loadingamount of the positive electrode material is 80% or more. According to the invention, the lithiated halloysite is applied to the lithium-sulfur battery positive electrode material for the first time,and lithium ions are adsorbed on the outer wall of a negatively charged tube of the halloysite through lithiation, so that the diffusion of the lithium ions is promoted, the contact with an electrolyte is facilitated, and the electrochemical reaction kinetics is improved. The high-sulfur-loading positively-charged tube inner wall adsorbs polysulfide anions generated in the charging and discharging process of the lithium-sulfur battery by utilizing the tube cavity space of the halloysite, so that the shuttle effect is inhibited. After lithiation, the rate capability, the specific capacity andthe cycling stability of the battery are remarkably improved. The preparation method disclosed by the invention takes cheap and easily available halloysite as a raw material, is low in cost and simplein process, and has an industrialization prospect.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur battery materials, in particular to a lithiated halloysite lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] Renewable energy plus new energy storage devices have become an effective model for human society to deal with energy crisis and environmental pollution. Earth's abundant and cheap sulfur is considered one of the candidates for developing advanced energy storage devices. The lithium-sulfur battery has a high theoretical specific capacity of 1675mAh g -1 , the battery energy density and volume density are as high as 2600Wh kg -1 with 2800Wh L -1 , which is 5-10 times that of other traditional lithium battery cathode materials (such as lithium cobaltate and lithium iron phosphate). However, the utilization of sulfur in lithium-sulfur batteries is usually hindered by some problems: (1) S and the final product Li 2 S are electron...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M10/052C01B33/20
CPCH01M4/628H01M4/38H01M10/052C01B33/20C01P2002/72C01P2004/04C01P2006/40H01M2004/021H01M2004/028Y02E60/10
Inventor 唐爱东张士林徐宗林赵启行杨华明
Owner CENT SOUTH UNIV
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