FeS2 nano-material with three-dimensional structure, and preparation method and application thereof

A nanomaterial and three-dimensional structure technology, applied in the field of materials, can solve the problems of inability to meet practical application requirements, low maximum specific capacity, complex preparation process, etc., and achieve the effects of low cost, simple preparation process and high electrochemical activity.

Active Publication Date: 2017-09-01
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although current researchers have controllably synthesized FeS with various morphologies 2 , such as one-dimensional nanostructured nanowires, nanosheets, and nanorods, etc., but Li / FeS based on these morphologies 2 The highest specific capacity achieved by the battery (maintained at 291mAh / g after 500 cycles) is still far below the requirements of commercial applications
Moreover, the existing one-dimensional nanostructured FeS 2 The preparation process of nanowires and nanosheets is complex and costly, and the prepared FeS 2 Contains other impurities such as sulfur, which leads to unstable performance and ultimately cannot meet the needs of practical applications

Method used

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  • FeS2 nano-material with three-dimensional structure, and preparation method and application thereof
  • FeS2 nano-material with three-dimensional structure, and preparation method and application thereof
  • FeS2 nano-material with three-dimensional structure, and preparation method and application thereof

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preparation example Construction

[0027] More preferably, the ultrasonic spraying conditions adopted in the preparation method include: the ultrasonic spraying frequency is 1.5-2.5 MHz, the nozzle diameter is 0.3-1.4 mm, the angle between the nozzle and the horizontal plane is 60-120°, and the applied DC voltage is 7-30kV, the curing distance is 5-10cm, the temperature is 0-35°C, the relative humidity is 10%-70%, and the carrier gas flow rate is 10-1000sccm. More preferably, the preparation method includes: placing the Fe nanoparticles in an air atmosphere, raising the temperature to 200-600° C. at a heating rate of 1-10° C. / min, performing constant temperature heat treatment for 10 minutes to 50 minutes, and then cooling naturally to room temperature, forming Fe with a three-dimensional porous structure 2 o 3 nanochain.

[0028] More preferably, the preparation method comprises: the Fe 2 o 3 The nanochains are placed in a hydrogen sulfide atmosphere, and the temperature is raised to 100-400°C at a heating...

Embodiment 1

[0050] Embodiment 1: Fe(CO) 5 (0.06M) and acetone were mixed at a volume ratio of 1:35, and stirred under magnetic stirring (100 rpm) for 20 minutes to form a yellow transparent solution; then add the prepared precursor solution into two spray barrels of ultrasonic spray, Make an atomized spray. The ultrasonic spray frequency is 1.7MHz, the nozzle diameter is 0.4mm, the angle between the nozzle and the horizontal plane is adjusted to 90°, a DC voltage of 8kV is applied, the curing distance is 6cm, the temperature is 5°C, and the relative humidity is 5%. The Fe(CO ) 5 Small droplets with a diameter of about 5 μm were brought out by compressed air (gas flow rate 30 sccm), and the droplets were sprayed onto a hot plate with a surface temperature of 60 °C to generate a large amount of carbon monoxide gas and Fe nanoparticles. The above-mentioned Fe nanoparticles prepared by ultrasonic spraying were put into a tube furnace for heat treatment in an air atmosphere (gas flow rate 50...

Embodiment 2

[0051] Embodiment 2: Fe(CO) 5 (0.25M) and acetone are mixed at a volume ratio of 1:35, and stirred for 50 minutes under magnetic stirring (1800 rpm) to form a yellow transparent solution; then add the prepared precursor solution into the two spray barrels of ultrasonic spray, Make an atomized spray. The ultrasonic spray frequency is 1.7MHz, the nozzle diameter is 1.2mm, the angle between the nozzle and the horizontal plane is adjusted to 90°, a DC voltage of 25kV is applied, the curing distance is 8cm, the temperature is 30°C, and the relative humidity is 60%. Fe(CO ) 5 Small droplets with a diameter of about 5 μm were brought out by compressed air (gas flow rate 800 sccm), and the droplets were sprayed onto a hot plate with a surface temperature of 160 °C to generate a large amount of carbon monoxide gas and Fe nanoparticles. The above-mentioned Fe nanoparticles prepared by ultrasonic spraying were put into a tube furnace for heat treatment in an air atmosphere (gas flow ra...

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Abstract

The invention discloses a FeS2 nano-material with a three-dimensional structure. The FeS2 nano-material is FeS2 nanochains with a three-dimensional porous structure or FeS2 nano-pedals with a three-dimensional structure. The invention also provides a method for preparing the FeS2 nano-material. For example, the FeS2 nanochains are prepared through a magnetic field-assisted ultrasonic spray pyrolysis method; or, the FeS2 nano-pedals are prepared through a hydrothermal synthesis method. The FeS2 nano-material provided by the invention has a three-dimensional structure, has high electrochemical activity, excellent electric properties and high mechanical strength, and has advantages of pure phase, high degree of crystallization, no impurity and the like. In addition, the preparation technology is simple and low-cost, has high output, and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to an electrode material, a preparation method thereof, an electrode and a battery. Background technique [0002] Ferrous disulfide (FeS 2 ) due to its high theoretical specific capacity (894mAh g -1 ), safe and non-toxic, stable in structure, low in price, and abundant in nature, it has attracted more and more great attention from academia and industry. But due to FeS 2 The drastic volume change and some irreversible side reactions during charge and discharge lead to rapid capacity decay and short cycle life. It is well known that the morphology of electrode materials has an important impact on its electrochemical performance, so it is necessary to design FeS with unique geometric structures. 2 To alleviate the impact of volume expansion, thereby improving its electrochemical energy storage performance. Although current researchers have controllably synthesized F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58B82Y30/00H01M10/0525H01M4/136
CPCB82Y30/00H01M4/136H01M4/5815H01M10/0525Y02E60/10
Inventor 张跃钢潘争辉杨洁刘美男侯远叶方敏
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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