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Preparation method for solid fluoride ion battery at room temperature based on tin-based fluoride MSnF4 laminated fluoride ion electrolyte

A technology of fluoride ions and electrolytes, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of solving high working temperature, simplifying the preparation process, and simple preparation process

Active Publication Date: 2019-07-16
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Layered tin-based fluoride MSnF 4 (M=Pb, Ba, Sr) has attracted much attention because of its high fluoride ion conductivity at room temperature, PbSnF 4 and BaSnF 4 The fluoride ion conductivity at room temperature reaches 1×10 -3 and 1×10 -4 S cm -1 However, these fluoride-ion electrolytes with high ionic conductivity have not been applied to solid-state fluoride-ion batteries (FIBs) so far.

Method used

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  • Preparation method for solid fluoride ion battery at room temperature based on tin-based fluoride MSnF4 laminated fluoride ion electrolyte
  • Preparation method for solid fluoride ion battery at room temperature based on tin-based fluoride MSnF4 laminated fluoride ion electrolyte
  • Preparation method for solid fluoride ion battery at room temperature based on tin-based fluoride MSnF4 laminated fluoride ion electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Weigh 5.2805g BaF respectively 2 and 4.7195g SnF 2 , under the protection of argon, the ball milling speed is 600rpm, the ball milling time is 20h, and the obtained ball milling product is dried at 80°C for 10h. figure 1 (a) BaSnF prepared by high energy ball milling method in this example 4 XRD pattern of the precursor powder. The obtained dry product was sintered under the protection of nitrogen gas, the sintering temperature was 300 °C, and the heating rate was 6 °C min -1 , the sintering time is 3h, and the BaSnF 4 Electrolyte powder. figure 1 BaSnF prepared before and after sintering for this example4 XRD pattern of electrolyte powder. BaSnF before sintering 4 Electrolyte powder XRD ( figure 1 (a)) at 2θ = 24.84°, 28.88°, 41.44° and 48.91° represent (102), (110), (200) and (212) characteristic peaks, respectively, which indicates that the BaSnF before sintering 4 The electrolyte powder has a cubic phase structure. Sintered BaSnF 4 Electrolyte powder XRD (...

Embodiment 2

[0030] Weigh 6.0889g PbF respectively 2 and 3.9112g SnF 2 , under the protection of nitrogen, the ball milling speed was 800rpm, the ball milling time was 15h, and the obtained ball milling product was dried at 60°C for 14h. figure 2 (a) is the PbSnF prepared by the high energy ball milling method in this embodiment 4 XRD pattern of the precursor powder. The obtained dry product was sintered under the protection of argon gas, the sintering temperature was 450 °C, and the heating rate was 3 °C min -1 , the sintering time is 2h, and the PbSnF 4 Electrolyte powder. figure 2 (b) is the PbSnF prepared after sintering of the present embodiment 4 XRD pattern of electrolyte powder. PbSnF before and after sintering 4 The XRD pattern performance of electrolyte powder and BaSnF 4 The same characteristic peak differentiation of electrolyte powder, compared with the standard card, shows that PbSnF 4 The electrolyte powder is a tetragonal phase before sintering and an orthorhombi...

Embodiment 3

[0032] Weigh 0.8g BiF respectively 3 , 0.2g carbon nanotubes and 1.0g BaSnF 4 or PbSnF 4 , under the protection of nitrogen, the ball milling speed is 200rpm, the ball milling time is 2h, and the obtained ball milling product is dried at 60°C for 3h to prepare BiF 3 Composite cathode material. in image 3 (a) is BiF of this embodiment 3 / BaSnF 4 / SEM image of carbon nanotube composite cathode material, image 3 (d) is BiF of this embodiment 3 / PbSnF 4 / SEM image of carbon nanotube composite cathode material. SEM images show that the electrolyte, electrode materials, and carbon nanotubes are evenly distributed. Weigh 1.0g Sn, 0.2g carbon nanotube and 0.8g BaSnF 4 or PbSnF 4 , under the protection of argon, the ball milling speed was 150rpm, the ball milling time was 4h, and the obtained ball milling product was dried at 70°C for 2h to prepare the Sn composite negative electrode material. in image 3 (c) is the Sn / BaSnF of this embodiment 4 / SEM image of carbon nan...

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Abstract

The present invention discloses a preparation method for a solid fluoride ion battery at room temperature based on a tin-based fluoride MSnF4 laminated fluoride ion electrolyte. In the present invention, the MF2 (M=Pb, Ba, Sr) is mixed with SnF2, and then used to prepare a tin-based fluoride MSnF4 fluoride ion electrolyte powder material with a laminated structure through combination of high energy ball mill and sintering, followed by preparation of electrolyte flake through cold pressing or hot pressing, the electrolyte powder material is compounded with an active material to prepare the composite electrode material of the fluoride ion battery, which is then successfully applied on the solid fluoride ion battery at room temperature. The fluoride ion electrolyte of the present invention has fluoride ion conductivity up to 1-8*10<-4>S cm<-1> at room temperature, and the gained battery has stronger stability in water and air and preferable charge and discharge cycle stability. The preparation method is simple and solves problem that the previous solid fluoride ion batteries only work at higher temperature and further widens application range of solid fluoride ion batteries.

Description

technical field [0001] The invention relates to new energy materials, in particular to a tin-based fluoride MSnF 4 Preparation of room temperature solid-state fluoride-ion batteries (FIBs) with layered fluoride-ion electrolytes. Background technique [0002] With the ever-increasing energy demand and the gradual depletion of existing fossil resources, the current environment-friendly, high-safety, high-energy-density, and low-cost rechargeable battery systems are being intensively studied as energy storage solutions. In recent years, among many new battery systems, solid-state fluoride-ion batteries (FIBs) have been favored by researchers because of their high theoretical energy density and high safety. Fluoride-ion batteries pass through the anion F - Shuttle in the fluoride ion conductor to realize energy conversion between positive and negative electrodes, F - It is the carrier in the charge and discharge process, and its theoretical energy density is as high as 5000Wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M4/38H01M10/054
CPCH01M4/362H01M4/582H01M4/583H01M4/625H01M4/38H01M10/054Y02E60/10
Inventor 王先友刘磊刘敏李晓龙余睿智陈曼芳阳立邵鼎盛罗凯丽
Owner XIANGTAN UNIV
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