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Long-service-life and high-specific-capacity poly-dopamine-coated hollow sulfur microsphere composite positive electrode material and preparation method thereof

A composite positive electrode material, polydopamine technology, applied in battery electrodes, electrical components, non-aqueous electrolyte storage batteries, etc., can solve the problems that restrict the marketization of lithium-sulfur batteries, poor cycle performance and poor rate performance of lithium-sulfur batteries, and achieve high The effects of rate performance, high specific capacity, and convenient operation

Inactive Publication Date: 2014-06-11
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the conductivity of elemental sulfur itself is poor (at room temperature 25°C, the conductivity is only 5×10-30 S / cm), and the polysulfides formed with lithium ions during charge and discharge It is easily soluble in organic electrolyte, which leads to the disadvantages of poor cycle performance, low specific capacity, and poor rate performance of lithium-sulfur batteries constructed with elemental sulfur as the positive electrode, thus restricting the further market of lithium-sulfur batteries with elemental sulfur as the positive electrode material change

Method used

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  • Long-service-life and high-specific-capacity poly-dopamine-coated hollow sulfur microsphere composite positive electrode material and preparation method thereof
  • Long-service-life and high-specific-capacity poly-dopamine-coated hollow sulfur microsphere composite positive electrode material and preparation method thereof
  • Long-service-life and high-specific-capacity poly-dopamine-coated hollow sulfur microsphere composite positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] first step: Slowly add 50 milliliters of 4% sodium thiosulfate aqueous solution into 100 milliliters of 3% polyvinylpyrrolidone (PVP, molecular weight 40,000) aqueous solution, and stir at a rate of 300 rpm for 60 minutes; then Slowly add 50 ml of hydrochloric acid aqueous solution with a mass concentration of 2%, and stir for 120 minutes at a rate of 300 rpm. After the reaction is completed, the product is filtered and cleaned to obtain hollow sulfur microspheres with a particle diameter of about 460 nanometers. (See figure 1 ).

[0028] Step two: Disperse the hollow sulfur microspheres into 100 ml of dopamine aqueous solution with a mass concentration of 1% and a pH value of 8.5, and stir at a rate of 200 rpm for 16 hours. After the reaction is completed, the product is filtered, washed and vacuum-dried ( The absolute vacuum degree is 1000 Pa, the drying temperature is 60 ° C, and the drying time is 10 hours), and the polydopamine-coated hollow sulfur microspher...

Embodiment 2

[0032] first step: Except that polyvinylpyrrolidone with a molecular weight of 50,000 was used as the surfactant, other operating steps were the same as in Example 1.

[0033] Step two:Disperse the hollow sulfur microspheres into 100 ml of dopamine aqueous solution with a mass concentration of 2% and a pH value of 8.5, and stir at a rate of 500 rpm for 10 hours. After the reaction is completed, the product is filtered, washed and vacuum-dried ( The absolute vacuum degree is 5000 Pa, the drying temperature is 200°C, and the drying time is 10 hours), and finally polydopamine-coated hollow sulfur microspheres with a particle diameter of 540 nm are obtained.

[0034] third step: Same as Embodiment 1.

[0035]

Embodiment 3

[0037] first step: Slowly pour 50 ml of the pre-configured ammonium thiosulfate aqueous solution with a mass concentration of 3% into 100 ml of a 4% polyethylene glycol (molecular weight 1000) aqueous solution, and stir at a speed of 400 rpm 60 minutes; then 50 milliliters of hydrochloric acid aqueous solution with a mass concentration of 1.8% was slowly added therein, and stirred at a speed of 500 rpm for 120 minutes. After the reaction was completed, the product was filtered and cleaned to obtain a particle diameter of about 500 nanometers. hollow sulfur microspheres.

[0038] Step two: Disperse the hollow sulfur microspheres into 100 ml of dopamine aqueous solution with a mass concentration of 1% and a pH value of 8.2, and stir at a rate of 200 rpm for 20 hours. After the reaction is completed, the product is filtered, washed and vacuum-dried (absolute The vacuum degree is 100 Pa, the drying temperature is 50°C, and the drying time is 15 hours), and finally polydopamine...

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Abstract

The invention discloses a long-service-life and high-specific-capacity poly-dopamine-coated hollow sulfur microsphere composite positive electrode material and a preparation method thereof. The preparation method comprises the following steps: preparing hollow sulfur microspheres through reaction of a surfactant, a sulfur-containing agent and acid; dispersing the hollow sulfur microspheres in a poly-dopamine water solution and after the reaction is finished, filtering, washing and carrying out vacuum drying a product to obtain the poly-dopamine-coated hollow sulfur microsphere composite positive electrode material. The preparation method has the advantages of the preparation process is simple, the operation is convenient and material performance is excellent; the prepared poly-dopamine-coated hollow sulfur microsphere composite positive electrode material is high in discharge specific capacity and good in cycling performance. is used as a positive electrode material of a lithium sulfur battery, the composite material has a wide application prospect in mobile communication, portable electronic devices, electric automobiles, energy storage and the relevant fields.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium batteries, in particular to a polydopamine-coated hollow sulfur microsphere composite cathode material with long life and high specific capacity and a preparation method thereof. Background technique [0002] With the rapid development of related fields such as mobile communications, portable electronic devices, electric vehicles and energy storage devices, higher and higher requirements are put forward for the performance of batteries, especially energy density, cycle life and rate. Therefore, it is of great strategic significance to develop new lithium-ion secondary batteries with high performance, low cost and environmental friendliness. The performance and price of cathode materials are the bottlenecks that restrict the further development of lithium-ion batteries to high energy, long life and low cost. Existing LiFePO 4 , LiMn 2 o 4 And cathode materials such as tern...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38
CPCH01M4/139H01M4/362H01M4/366H01M10/052Y02E60/10
Inventor 徐辉邓远富覃旭松陈国华
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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