Solid electrolyte and preparation method and application thereof

A solid electrolyte, electrolyte salt technology, applied in the field of electrochemistry

A solid electrolyte, electrolyte salt technology, applied in the field of electrochemistry

CN110165291AActive Publication Date: 2019-08-23SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Solid electrolyte and preparation method and application thereof
  • Solid electrolyte and preparation method and application thereof
  • Solid electrolyte and preparation method and application thereof

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Experimental program
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preparation example Construction

[0166] In some specific embodiments, the polymer solution is sprayed onto a selected receiving surface by electrospinning technology to form (i.e. polymer fibers aggregate to form) a continuous three-dimensional structure, and at the same time, the inorganic particles are sprayed by electrostatic spraying technology. The dispersion liquid is sprayed onto the selected receiving surface to obtain a composite material composed of an organic phase composed of a polymer material and inorganic particles, and then the composite material is subjected to pressure treatment to make it denser, as the For the membrane material, the distance between the electrospinning liquid outlet and the receiving surface may be 5-30 cm, and the electrostatic voltage may be, for example, 5-50 KV. The pressure of the pressure treatment may be 100KPa-20MPa, the time is 1-60 minutes, preferably 1-10 minutes, and the temperature is 25-60°C. As one of the preferred embodiments, the preparation method include...

Embodiment 1-1

[0295] About 1 g of commercially available polyacrylonitrile (PAN) powder was dissolved in 7 g of N,N-dimethylformamide (DMF) to obtain a polyacrylonitrile solution. Spinning is then carried out under the electrostatic voltage of 15KV, the distance between the nozzle and the roller collector is 15cm, and the flow rate of the polyacrylonitrile solution is 15μl / min. After working like this for about 5 hours, a sheet can be peeled off from the roller device. The flexible polymer film was then rolled at about 2MPa for about 10 minutes, then soaked in 1mol / L lithium perchlorate / ethanol solution for 5 minutes, and then vacuum-dried to remove the solvent therein to obtain a 20μm thick, polymer film. A solid electrolyte with a mass ratio of lithium salt of 2:1, its density is 1.9g / cm 3 .

[0296] Calculate the specific interface area of ​​the solid electrolyte according to the calculation method of the specific interface area described above in the present invention to be about 1.0×1...

Embodiment 1-2

[0301] About 1 g of commercially available polymethyl methacrylate (PMMA) powder was dissolved in 9 g of DMF to obtain a polymethyl methacrylate solution. Spinning is then carried out under the electrostatic voltage of 15KV, the distance between the nozzle and the drum collector is 15cm, and the flow rate of the polymethyl methacrylate solution is 15μl / min. After working like this for about 7 hours, it can be peeled off from the drum device. Next, roll a flexible polymer film at about 2MPa for about 10 minutes, then soak it in 1mol / L lithium hexafluorophosphate / ethanol solution for 5 minutes, and then vacuum dry to remove the solvent in it to obtain a 30μm thick, polymer film. A solid electrolyte with a mass ratio of lithium salt of 4:1, its density is 2.2g / cm 3 .

[0302] Calculate the specific interface area of ​​the solid electrolyte according to the calculation method of the specific interface area described above in the present invention to be about 3.5×10 5 cm 2 / cm ...

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Abstract

The invention discloses a solid electrolyte and a preparation method and application thereof, and the solid electrolyte contains a membrane material and electrolyte salt, wherein an organic phase comprises a three-dimensional communicated interface, the specific area of the organic phase is greater than or equal to 1 * 10<4> cm2 / cm3, and the electrolyte salt is dissolved in the organic phase. Thepreparation method of the solid electrolyte comprises the following steps: spraying the solution of a high polymer material to a selected receiving surface by adopting an electrostatic spinning technology to form a continuous three-dimensional structure, selectively and simultaneously spraying dispersion liquid of inorganic particles to the selected receiving surface by adopting the electrostaticspraying technology, and then carrying out pressurizing treatment to obtain a membrane material; and dropwise adding or spraying the solution of the electrolyte salt into the membrane material or impregnating the membrane material into the solution of the electrolyte salt. The room-temperature conductivity of the solid electrolyte reaches up to 10<-3> S / cm, and the method does not depend on the addition of a special polymer or filler. The solid electrolyte has the advantages of simple preparation, low cost, wide raw material source and the like.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a solid electrolyte, a preparation method thereof and an electrochemical device containing the solid electrolyte. Background technique [0002] In the past 20 years, with the rapid development of the portable consumer electronics industry, lithium-ion batteries have achieved great commercial success due to their high energy density, good cycle performance and rate performance. However, the continuous occurrence of lithium-ion battery safety accidents in the past few decades has always been a hidden concern in the field. [0003] Lithium-ion batteries may cause fire and explosion hazards due to internal short-circuit or other reasons that cause excessive internal temperature of the battery. The main reason is that high-temperature and flammable organic electrolytes are used as lithium-ion conductive networks. Therefore, once the internal temperature of the battery reac...

Claims

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Application Information

Patent Timeline
23 Aug 2019
Publication
CN110165291A
IPC
H01M10/056; H01M10/0565; D04H1/728; H01M50/443; H01M50/489
CPC
H01M10/0565; D04H1/728; H01M2300/0082; H01M10/058; H01M10/0525; G02F1/1508; H01M50/443; H01M50/489
Inventors
胡晨吉; 沈炎宾