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Method for preparing sulfur positive electrode of lithium-sulfur battery from tubular mineral

A lithium-sulfur battery and sulfur cathode technology, which is applied in the field of preparing the lithium-sulfur battery sulfur cathode from tubular minerals, can solve the problems of slow electrochemical reaction kinetics, poor rate performance, poor cycle stability, etc., so as to suppress the shuttle effect and improve the Reaction kinetics, low cost effect

Pending Publication Date: 2022-07-15
CENT SOUTH UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned shortcomings currently existing, the present invention provides a method for preparing a lithium-sulfur battery sulfur positive electrode from tubular minerals. This application is aimed at the slow electrochemical reaction kinetics and shuttle effect in the current lithium-sulfur battery, which lead to poor rate performance and poor cycle performance. Poor stability and other issues

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  • Method for preparing sulfur positive electrode of lithium-sulfur battery from tubular mineral
  • Method for preparing sulfur positive electrode of lithium-sulfur battery from tubular mineral
  • Method for preparing sulfur positive electrode of lithium-sulfur battery from tubular mineral

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preparation example Construction

[0033] The invention provides a preparation method for preparing a lithium-sulfur battery sulfur positive electrode from a tubular mineral, which specifically includes the following steps:

[0034] Step 1: Disperse the kaolin in a mixed solution of DMOS and deionized water, stir in an oil bath at 90°C for 3 hours, separate the solid by centrifugation, and dry at 60°C for 24 hours to obtain pretreated kaolin. Preferably, the centrifugation rate is 3500rpm / min, and the centrifugation time is 5min; preferably, the mass ratio of kaolin, DMSO and deionized water is 1:(5-9):(1-2).

[0035] Step 2: Add pretreated kaolin to anhydrous AlCl 3 The mixed solution with methanol was magnetically stirred for 12 hours, the solid was separated by centrifugation, then HCl was added, stirred in a water bath at 85°C for 1 hour, washed with methanol for several times, and air-dried naturally to obtain the preliminary treated kaolin. Preferably, pretreated kaolin, anhydrous AlCl 3And the mass rat...

Embodiment 1

[0064] (1) Treatment of kaolin

[0065] Disperse 10 g of kaolinite powder in a mixture of 90 mL of DMSO and 10 mL of deionized water, stir in an oil bath at 90 °C for 3 h, centrifuge to separate the solid, and then dry at 60 °C for 24 h to obtain pretreated kaolin (Kaol-D). Take 5g Kaol-D powder and add it to 50mL of 1mol / L AlCl 3 In the methanol mixed solution, magnetically stirred for 12 h, centrifuged to separate the solid, then added 15 mL of 1 mol / L HCl, stirred in a water bath at 85 °C for 1 h (under airtight conditions), washed with methanol 5 times, and air-dried naturally to obtain the preliminary treatment kaolin (Kaol-Me). Add 2 g of Kaol-Me to 40 mL of 1 mol / L CTAB methanol mixed solution, condense and reflux for 24 h at 85 °C, filter, wash with methanol for several times, and dry at 60 °C for 24 h to obtain reprocessed kaolin (Kaol-C). Take 1 g of Kaol-C and add it to 40 mL of 0.5 mol / L CTAB solution, and use an ultrasonic cell disintegrator for ultrasonication. ...

Embodiment 2

[0075] (1) Treatment of kaolin

[0076] Disperse 10 g of kaolinite powder in a mixture of 90 mL of DMSO and 20 mL of deionized water, stir in an oil bath at 90 °C for 3 h, centrifuge to separate the solid, and then dry at 60 °C for 24 h to obtain pretreated kaolin (Kaol-D). Take 5g Kaol-D powder and add it to 50mL 2mol / L AlCl 3 In the methanol mixed solution, magnetically stirred for 12 h, centrifuged to separate the solid, then added 15 mL of 1 mol / L HCl, stirred in a water bath at 85 °C for 1 h (under airtight conditions), washed with methanol 5 times, and air-dried naturally to obtain the preliminary treatment kaolin (Kaol-Me). 2g Kaol-Me was added to 20mL 1mol / L CTAB methanol mixed solution, condensed and refluxed for 24h at 85°C, stirred for 24h, filtered and washed with methanol for several times, and dried at 60°C for 24h to obtain reprocessed kaolin (Kaol-C). Take 1 g of Kaol-C and add it to 40 mL of 1.5 mol / L CTAB solution, and use an ultrasonic cell disintegrator to...

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Abstract

The invention discloses a method for preparing a sulfur positive electrode of a lithium-sulfur battery from tubular minerals, and the method specifically comprises the following steps: treating flaky kaolin with dimethyl sulfoxide (DMSO), methanol and cetyltrimethylammonium bromide (CTAB), stripping and curling by using an ultrasonic cell crusher to obtain a kaolin nano reelpipe with a halloysite-like structure, and drying the kaolin nano reelpipe to obtain the sulfur positive electrode of the lithium-sulfur battery. The kaolin nano reelpipe and sublimed sulfur are uniformly mixed, the kaolin nano reelpipe sulfur-loaded composite material is obtained in closed air through a melt diffusion method, and the shuttle effect can be effectively inhibited when the kaolin nano reelpipe sulfur-loaded composite material is used as the positive electrode of the lithium-sulfur battery; the tube wall is only 4-6nm, so that the diffusion speed of lithium ions in the battery can be effectively improved; more active sulfur can be accommodated in the tube cavity; the kaolin nano reelpipe material provided by the invention has the advantages of low raw material cost, simple preparation process and easy realization of large-scale application, and has better rate capability and cycle performance than natural halloysite and acid-modified halloysite when being used as a sulfur positive electrode of a lithium-sulfur battery.

Description

technical field [0001] The invention relates to the technical field of preparation of positive electrode materials for lithium-sulfur batteries, in particular to a preparation method for preparing sulfur positive electrodes of lithium-sulfur batteries from tubular minerals. Background technique [0002] Lithium-sulfur batteries have a high theoretical specific capacity (1675mAh g -1 ) and energy density (2600Wh kg -1 ), which is more than five times that of existing lithium-ion batteries, and the cathode material sulfur has the characteristics of abundant resources, low cost and environmental friendliness, and is considered to be one of the most potential secondary batteries in the next generation. However, the poor conductivity of cathode sulfur, the volume expansion during cycling, and the “shuttle effect” caused by the dissolution of intermediate lithium polysulfides in the electrolyte restrict the further development of lithium-sulfur batteries. To solve these problems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/139H01M4/1397B82Y30/00H01M4/38H01M4/58H01M10/052
CPCH01M4/362H01M4/1397H01M4/139H01M10/052H01M4/62B82Y30/00H01M4/5815H01M4/38H01M2004/028
Inventor 唐爱东徐宗林张士林杨华明
Owner CENT SOUTH UNIV
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