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Preparation method and application of graphene/sulfur/prussian blue analogue composite material

A technology of Prussian blue and composite materials, applied in the field of preparation of graphene/sulfur/Prussian blue analog composite materials, can solve the problems of poor cycle stability, low Coulombic efficiency, low sulfur conductivity, etc., and achieve good conductivity, good Effects of mechanical properties, unique electrochemical properties

Active Publication Date: 2020-04-21
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the low conductivity of sulfur, the volume fluctuates greatly during the cycle, and the intermediate product polysulfide produced by the redox reaction between elemental sulfur and lithium is easily dissolved in the electrolyte, which is the infamous "shuttle effect", resulting in poor cycle stability. , the Coulombic efficiency is low, and the capacity decays rapidly
Moreover, these problems can only be mitigated, not eliminated

Method used

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  • Preparation method and application of graphene/sulfur/prussian blue analogue composite material
  • Preparation method and application of graphene/sulfur/prussian blue analogue composite material

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specific Embodiment approach 1

[0035] A kind of preparation method of graphene / sulfur / Prussian blue analog composite material, comprises the steps:

[0036]Step 1. Preparation of Prussian blue analogues: Weigh a certain mass of sodium ferrocyanide decahydrate and polyvinylpyrrolidone, add them to a certain volume of hydrochloric acid solution, stir evenly, and drop a certain volume of Cobalt chloride solution, after the dropwise addition, continue to stir for a certain period of time, then put it in an oven, react at a constant temperature of 80-90°C for 10-12 hours, filter after the reaction, wash the obtained precipitate with distilled water and ethanol, and dry it in vacuum to obtain Prussia Blue analogue, ready to use;

[0037] Step 2, preparation of sulfur / Prussian blue analog composite material: weigh the Prussian blue analog and sulfur powder prepared in step 1 according to a certain mass ratio, add it to a certain volume of carbon disulfide solution, stir evenly, and steam at a certain temperature ...

specific Embodiment approach 2

[0055] The graphene / sulfur / Prussian blue analogue composite material prepared according to the preparation method of the graphene / sulfur / Prussian blue analogue composite material described in Embodiment 1 is used as a cathode material for a lithium-sulfur battery.

specific Embodiment approach 3

[0057] A kind of preparation method of graphene / sulfur / Prussian blue analog composite material, comprises the steps:

[0058] Step 1. Preparation of Prussian blue analogues: Weigh a certain mass of sodium ferrocyanide decahydrate and polyvinylpyrrolidone, add them to a certain volume of hydrochloric acid solution, stir evenly, and drop a certain volume of Cobalt chloride solution, after the dropwise addition, continue to stir for a certain period of time, then put it in an oven, react at a constant temperature of 80-90°C for 10-12 hours, filter after the reaction, wash the obtained precipitate with distilled water and ethanol, and dry it in vacuum to obtain Prussia Blue analogue, ready to use;

[0059] Step 2, preparation of sulfur / Prussian blue analog composite material: weigh the Prussian blue analog and sulfur powder prepared in step 1 according to a certain mass ratio, add it to a certain volume of carbon disulfide solution, stir evenly, and steam at a certain temperature ...

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Abstract

The invention discloses a preparation method and application of a graphene / sulfur / prussian blue analogue composite material, and belongs to the field of preparation methods of lithium-sulfur battery materials. The preparation method comprises the steps: adding prussian blue analogue and sulfur powder into a certain volume of carbon disulfide solution, uniform stirring, evaporating the carbon disulfide solution to dryness at a certain temperature, centrifugally washing the obtained product with distilled water, and drying to obtain the sulfur / prussian blue analogue composite material; and diluting a graphene aqueous suspension with a certain concentration, ultrasonically dispersing for a certain time, adding a certain mass of sulfur / prussian blue analogue composite material, adding a certain volume of hydrazine hydrate, stirring for a certain time, washing the obtained product with distilled water, and carrying out vacuum freeze drying to obtain the graphene / sulfur / prussian blue analogue composite material. The first discharge capacity is as high as 850mAh / g; and the capacity can be kept at 900mAh / g under the multiplying power of 0.5 C, and the excellent multiplying power performance is realized.

Description

technical field [0001] The invention belongs to the field of preparation methods of lithium-sulfur battery materials; in particular, it relates to a preparation method and application of a graphene / sulfur / Prussian blue analog composite material. Background technique [0002] The demand for clean and efficient energy storage devices has been steadily increasing due to heightened concerns about limited global energy supplies, environment and climate change. Batteries are one of the most prominent clean and efficient energy sources. Currently, advanced lithium-sulfur batteries are the technology of choice for the development of portable electronic devices and electric vehicles. However, existing rechargeable lithium-sulfur battery systems cannot meet the growing demands in the field of high-capacity storage. Therefore, the power density and energy density of lithium-sulfur batteries need to be significantly improved. At present, the low specific capacity of cathode materials...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/583H01M10/052
CPCH01M4/362H01M4/38H01M4/58H01M4/583H01M10/052H01M2004/028Y02E60/10
Inventor 陈明华刘晓雪梁心琪陈庆国
Owner HARBIN UNIV OF SCI & TECH
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