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Polycarbonate cross-linked solid polymer electrolyte and application thereof

A technology of solid polymer and polycarbonate, which is applied in the direction of electrolyte immobilization/gelation, circuits, electrical components, etc., and can solve the problems of not being able to effectively deal with the volume strain of positive and negative electrodes

Pending Publication Date: 2020-04-10
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of small molecular carbonic acid crosslinking agents, the composite carbonic acid crosslinked structure gel polymer electrolyte membrane has high brittleness, which cannot effectively cope with the volume strain of the positive and negative electrodes during charge and discharge.

Method used

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  • Polycarbonate cross-linked solid polymer electrolyte and application thereof
  • Polycarbonate cross-linked solid polymer electrolyte and application thereof
  • Polycarbonate cross-linked solid polymer electrolyte and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0062] (1) Preparation of positive electrode sheet

[0063] A. Dissolve polyvinylidene fluoride (PVDF) in N-methylpyrrolidone at a concentration of 0.1 mol / L.

[0064] B. After mixing PVDF, positive electrode active material, and conductive carbon black at a mass ratio of 10:80:10, grind for at least 1 hour.

[0065] C. Scrape the slurry obtained in the previous step evenly on the aluminum foil with a thickness of 100-120 μm, first dry it in a 60°C oven, then dry it in a 120°C vacuum oven, roll it, and weigh it. Dry in a vacuum oven at 120°C and store in a glove box for later use.

[0066] (2) Preparation of negative electrode sheet

[0067] A. Dissolve PVDF in N-methylpyrrolidone at a concentration of 0.1mol / L.

[0068] B. After mixing PVDF, negative electrode active material, and conductive carbon black at a mass ratio of 10:80:10, grind for at least 1 hour.

[0069] C. Scrape the slurry obtained in the previous step evenly on the copper foil with a thickness of 100-120 ...

Embodiment 1

[0076] In the glove box, under an inert atmosphere, configure the polymer matrix according to the records in Table 1 (polymerization monomer is P1 (n=2)), a mixed solution of lithium salt and azobisisobutyronitrile (azobisisobutyronitrile accounts for 0.5% of the total mass of the target polymer matrix), inject it into the coin cell assembled according to the above-mentioned description; seal After polymerizing in an oven at 60°C for 12 hours, a solid polymer electrolyte is formed in an all-solid lithium battery.

[0077] Electrochemical stability and tensile strength test (see figure 1 and Table 1).

[0078] Table 1 Solid polymer electrolyte composition and test results

[0079]

[0080] Depend on figure 1 It can be seen that the polymer electrolyte has an electrochemical window of 0-4.7V. It can be seen from Table 1 that the tensile strength of the polymer electrolyte membrane can reach 21MPa. The higher oxidation resistance and higher mechanical properties of the ele...

Embodiment 2

[0082] In the glove box, under an inert atmosphere, configure the polymer matrix according to the records in Table 2 (polymerization monomer is P2

[0083] (n=100)

[0084] and polyethylene glycol diacrylate (this is obtained by crosslinking other monomers through polycarbonate, and the amount of the two accounts for 10% and 90% of the mass of the polymer matrix respectively), lithium salts and benzophenone-containing (polymerized 1% of the mass of the polymer matrix) in N,N-dimethylformamide solution, and the polymer matrix accounts for about 40% of the mass fraction of the solution. The solution was thoroughly stirred to obtain a clear and transparent viscous liquid. The above solution was evenly scraped on the polyimide non-woven membrane, then irradiated under a high-pressure mercury lamp (1000W) for 10min, and then dried to prepare a solid-state electrolyte membrane. The electrolyte membrane was dried in a vacuum oven at 70°C for 20 hours after being sliced, and then ...

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Abstract

The invention relates to a polycarbonate cross-linked solid polymer electrolyte and an application thereof in a secondary lithium battery. The decomposition voltage of the solid polymer electrolyte is4.5-6.0 V, the ionic conductivity of the solid polymer electrolyte is 0.01-9 mS.cm<-1 >, the tensile strength of the solid polymer electrolyte is 5-400 MPa, and the solid polymer electrolyte can be applied to a high-voltage lithium battery. The invention also provides an application example of the polymer electrolyte in a secondary lithium battery.

Description

technical field [0001] The invention relates to the field of secondary lithium batteries, in particular to a polycarbonate crosslinked solid polymer electrolyte and its application in secondary lithium batteries. Background technique [0002] Due to the advantages of high energy density and good safety, lithium-ion batteries have achieved great development in the fields of mobile devices, electric vehicles, and smart grids. At the same time, the increasingly urgent demand for high-energy-density lithium batteries in the consumer market has greatly promoted research and development in this field. However, the recent serious battery burning accidents in Tesla Model S cars (the battery pack uses ternary materials as the positive electrode active material) have sounded the alarm for the commercial application of lithium batteries. Studies have found that flammable and volatile organic electrolytes are largely responsible for the thermal runaway of batteries (Energy Storage Mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0565H01M10/0525H01M2300/0085Y02E60/10
Inventor 崔光磊张焕瑞王鹏徐翰涛徐红霞
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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