Grapheme oxide-coated sulfur particle composite anode material for lithium-sulfur battery and preparation method thereof

A graphene-coated, sulfur cathode material technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems that restrict the marketization of lithium-sulfur batteries, low coulombic efficiency of lithium-sulfur batteries, and poor conductivity of sulfur single substance. , to achieve high rate performance, high specific capacity, and the effect of inhibiting dissolution

Active Publication Date: 2015-08-19
深圳特新界面科技有限公司
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  • Abstract
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Problems solved by technology

However, lithium-sulfur batteries still face many challenges, including poor conductivity of sulfur (5×10-30 S cm-1 at 25 ℃), low ion diffusion coefficient , large volume change (~ 80%), and polysulfide dissolution. These series of problems lead to low Coulombic efficiency, poor cycle life and serious capacity fading during the charging and discharging process of lithium-sulfur batteries, which restrict lithium-sulfur batteries. further marketization of

Method used

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  • Grapheme oxide-coated sulfur particle composite anode material for lithium-sulfur battery and preparation method thereof
  • Grapheme oxide-coated sulfur particle composite anode material for lithium-sulfur battery and preparation method thereof
  • Grapheme oxide-coated sulfur particle composite anode material for lithium-sulfur battery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The first step: prepare 150 ml of polyvinylpyrrolidone (PVP, molecular weight 55,000) aqueous solution with a mass fraction of 3%, and stir at a speed of 500 rpm for 60 minutes; 1.5 g of sodium thiosulfate is dissolved in 5 ml of deionized water to form an aqueous solution containing Sulfur reagent aqueous solution, pour this solution into the above polyvinylpyrrolidone aqueous solution and stir at 500 rpm for 60 minutes to form a uniform solution; then slowly add 7.5 ml of hydrochloric acid aqueous solution with a concentration of 2 mol / L, and Stir at 800 rpm for 120 minutes. After the reaction is complete, the product is centrifuged and washed to obtain hollow sulfur microspheres with a particle diameter of about 500 nanometers.

[0028]Step 2: Disperse hollow sulfur microspheres into 10 ml of aqueous hydrochloric acid solution with a concentration of 2 mol / L, ultrasonicate for 15 minutes, and add 10 ml of graphite oxide with a mass concentration of 0.0005% dropwise at...

Embodiment 2

[0031] The first step: prepare 150 ml of polyvinylpyrrolidone (PVP, molecular weight 55,000) aqueous solution with a mass fraction of 0.02%, and stir at a speed of 500 rpm for 60 minutes; 1.5 g of sodium thiosulfate is dissolved in 5 ml of deionized water to form an aqueous solution containing Sulfur reagent aqueous solution, pour this solution into the above polyvinylpyrrolidone aqueous solution and stir at 500 rpm for 60 minutes to form a uniform solution; then slowly add 7.5 ml of hydrochloric acid aqueous solution with a concentration of 2 mol / L, and Stir at a speed of 500 rpm for 120 minutes. After the reaction is completed, the product is centrifuged and washed to obtain sulfur microspheres with a particle diameter of about 500 nanometers.

[0032] The second step: except that 10 ml of graphene oxide aqueous solution with a mass fraction of 0.005% is used, other operating steps are the same as in the first implementation.

[0033] The third step: the same as the first em...

Embodiment 3

[0035] Step 1: Except for using an aqueous solution of polyethylene glycol (molecular weight: 1000) with a mass concentration of 0.1%, other operating steps are the same as in Example 1. Irregular-shaped sulfur particles are thus obtained, with a particle size of 1-3 microns.

[0036] The second step: disperse the sulfur microspheres into 10 ml of aqueous hydrochloric acid solution with a concentration of 2 mol / L, ultrasonicate for 15 minutes, and add a graphene oxide aqueous solution with a mass concentration of 0.0001% dropwise at a speed of 500 rpm, After stirring for 120 minutes, let it stand for 2 hours; the product is centrifuged, cleaned and vacuum-dried (the centrifugal separation speed is 5000 rpm, and the cleaning solvent is deionized water and ethanol; the absolute vacuum degree of vacuum drying is 100Pa, and the drying temperature is 50°C, drying time is 10 hours), and finally a graphene oxide-coated sulfur microsphere composite positive electrode material is obtai...

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Abstract

The invention discloses a graphene oxide-coated sulfur particle composite anode material for a lithium-sulfur battery and a preparation method thereof, and belongs to the field of new-generation energy materials. The composite anode material comprises graphene oxide, modified graphene oxide and graphene-coated micro-scale sulfur particles, nano-scale sulfur particles and hollow sulfur particles. The composite anode material consists of an inner-layer sulfur core and graphene oxide coated on an outer layer. The preparation method comprises the following steps: preparing the micro-scale sulfur particles, the nano-scale sulfur particles and the hollow sulfur particles; after graphene oxide or graphene dispersion liquid is added, preparing an outer-layer graphene oxide or graphene coating layer; and performing washing and drying treatment to obtain the graphene oxide-coated sulfur anode material. The preparation method is simple in process, low in cost, and suitable for industrial production. The prepared composite anode material for the lithium-sulfur battery has the advantages of high energy density, high cycle performance, excellent rate performance and the like, and has a wide application prospect in the energy storage related field.

Description

technical field [0001] The invention belongs to the field of new-generation energy storage, and specifically relates to a long-life, high-specific-capacity graphene oxide-coated sulfur particle composite cathode material and a preparation method thereof. Background technique [0002] Air pollution and global warming have become problems that cannot be ignored. At the same time, global energy consumption will increase exponentially in the next few decades. Therefore, the development of clean energy technology is imminent. Among numerous energy storage devices, rechargeable lithium-ion batteries still occupy the most important commercial market. However, the current lithium-ion batteries can no longer meet the market's demand for advanced technology and low cost. For example, in the field of power batteries, energy storage batteries must have extremely high energy density and long cycle life. The current lithium-ion batteries are limited by their theoretical capacity and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62
CPCH01M4/366H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 蔡玉荣张佳卫姚菊明
Owner 深圳特新界面科技有限公司
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