A nano-metal coated sulfur composite material and applications thereof

A composite material and nano-metal technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of unfavorable energy conservation and environmental protection, complicated process, high energy consumption, etc., and achieve the effect of easy industrial implementation, simple preparation process and low price

Inactive Publication Date: 2013-04-24
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although carbon/sulfur composites have made some progress, the sulfur content in the composites is still low and cannot provide high specific capacity
In addition, the preparation of high-quality microporous/mesoporous carbon materials is complex and often requires heat treatment, which...

Method used

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  • A nano-metal coated sulfur composite material and applications thereof
  • A nano-metal coated sulfur composite material and applications thereof
  • A nano-metal coated sulfur composite material and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method of nano-platinum-coated sulfur composite material, the method steps are as follows:

[0033] First, 1.294 g of chloroplatinic acid (chemical purity: 99.5%) was dissolved in 50 mL of deionized water to prepare a 0.05 mol / L aqueous solution; then 1.6 g of sublimed sulfur powder (chemical purity: 99% %, with an average particle size of 2 μm), vigorously stirred for 1 hour to form a uniform suspension; at the same time, 0.379 g of sodium borohydride (chemical purity: 99%) was added to 100 mL of deionized water to prepare a 0.1 mol / L aqueous solution . Under high-speed stirring, the sodium borohydride aqueous solution was slowly added dropwise to the chloroplatinic acid aqueous solution containing sulfur powder, so that the platinum ions were fully reduced into nano-platinum particles; finally, the obtained precipitate was repeatedly centrifuged and washed with deionized water. times, at 60 o C and dried for 24 hours to obtain the nano-platinum-coated ...

Embodiment 2

[0037] A preparation method of nano-gold coated sulfur composite material, the method steps are as follows:

[0038]First, 2.059 g of chloroauric acid (chemical purity: 99.5%) was dissolved in 50 mL of deionized water to prepare a 0.1 mol / L aqueous solution; then 5 g of sublimed sulfur powder (chemical purity: 99% %, with an average particle size of 1 μm), vigorously stirred for 2 hours to form a uniform suspension; at the same time, 1.348 g of potassium borohydride (chemical purity: 99%) was added to 50 mL of deionized water to prepare a 0.5 mol / L aqueous solution . Under high-speed stirring, the aqueous solution of potassium borohydride was slowly added dropwise to the aqueous solution of chloroauric acid containing sulfur powder, so that the gold ions were fully reduced into nano-gold particles; finally, the obtained precipitate was repeatedly centrifuged and washed with deionized water. times, at 80 o C and dried for 12 hours to obtain the nano-gold-coated sulfur composi...

Embodiment 3

[0042] A preparation method of nano-nickel-coated sulfur composite material, the method steps are as follows:

[0043] First, 6.57 g of nickel sulfate hexahydrate (chemical purity: 99%) and 100 mL of deionized water were prepared into a 0.25 mol / L aqueous solution; then 40 g of sublimed sulfur powder (chemical purity: 99%, The average particle size is 3 μm), and vigorously stirred for 30 minutes to form a uniform suspension; at the same time, 7.57 g of sodium borohydride (chemical purity: 99%) was added to 200 mL of deionized water to prepare a 1 mol / L aqueous solution. Under high-speed stirring, the sodium borohydride aqueous solution was slowly added dropwise to the nickel sulfate aqueous solution containing sulfur powder, so that the nickel ions were fully reduced into nano-nickel particles; finally, the obtained precipitate was repeatedly centrifuged and washed with deionized water for several times. 50 o C and dried for 24 hours to obtain nano-nickel-coated sulfur compos...

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Abstract

The present invention discloses a nano-metal coated sulfur composite material and applications thereof. The preparation method for the nano-metal coated sulfur composite material comprises the following steps of: (1) dissolving the metal compound in deionized water to prepare a precursor aqueous solution; (2) adding powdered sulfur into the precursor aqueous solution, and fully stirring for uniformly mixing to form a suspension; (3) by using sodium borohydride or potassium borohydride as a r reducing agent, dissolving the reducing agent in deionized water to prepare a reducing agent aqueous solution; (4) under the condition of stirring at room temperature, adding the reducing agent aqueous solution dropwise to the suspension to make the metal ions fully reduced, and coated on the powdered sulfur surface, and isolating to obtain the nano-metal coated sulfur composite material. The composite material is used as the cathode material for lithium sulfur batteries, has the characteristics of high specific capacity and excellent cycling stability; and the material of the present invention is simple in the preparation method, inexpensive in the cost, excellent in performance, and easy to realize industrialization.

Description

(1) Technical field [0001] The invention relates to a nanometer metal-coated sulfur composite material and its application as a lithium-sulfur battery cathode material. (2) Background technology [0002] As a new generation of "green" secondary batteries, lithium batteries have the characteristics of high open circuit voltage, high energy density, long cycle life, and environmental friendliness. They have broad application prospects in portable appliances, electric vehicles, and energy storage systems. At present, limited by the low specific capacity of positive electrode materials, lithium batteries still cannot meet the requirements of high power and high capacity fields. Therefore, the development of high specific energy and high specific power positive electrode materials is of great significance. Elemental sulfur has a very high theoretical specific capacity of 1672mAh / g, and its theoretical specific energy is as high as 2600Wh / kg, which can actually reach 500~800 Wh / kg...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62
CPCY02E60/12Y02E60/10
Inventor 夏阳张文魁陶新永黄辉甘永平
Owner ZHEJIANG UNIV OF TECH
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