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High-cohesiveness solid electrolyte prepared by in-situ curing, preparation method and application thereof

A technology of solid electrolyte and high adhesion, which is applied in the direction of solid electrolyte, electrolyte battery manufacturing, non-aqueous electrolyte, etc., and can solve problems such as poor rate and cycle performance, and large solid/solid interface impedance

Active Publication Date: 2020-10-16
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

All of these solid polymer electrolytes are prepared by pre-preparing polymer films and then assembled into batteries by winding or stacking the positive and negative electrodes of the battery, which leads to a gap between the battery poles / solid electrolyte The solid / solid interface impedance is very large, and the charge and discharge performance, rate and cycle performance of solid-state batteries are relatively poor

Method used

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  • High-cohesiveness solid electrolyte prepared by in-situ curing, preparation method and application thereof
  • High-cohesiveness solid electrolyte prepared by in-situ curing, preparation method and application thereof
  • High-cohesiveness solid electrolyte prepared by in-situ curing, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0056] (1) Preparation of positive electrode sheet

[0057] 1) Dissolve polyvinylidene fluoride (PVDF) in N,N-2-methylpyrrolidone with a solid content of 6%.

[0058] 2) After mixing the positive electrode active material, PVDF solution, and conductive carbon black at a mass ratio of 95:2:3, grind for at least 3 hours, wherein the positive electrode active material is lithium cobaltate, lithium iron phosphate, lithium manganese iron phosphate, manganese One of Lithium Oxide, Lithium Nickel Manganese Oxide and NCM ternary materials.

[0059] 3) Apply the slurry obtained in the previous step evenly on the aluminum foil with a thickness of 50-100 μm, and dry it at 80°C first, and the positive active material content is less than 10 mg / cm 2 , rolled, and then dried in a vacuum oven at 120°C, punched, weighed and then dried in a vacuum oven at 120°C, and placed in a glove box for use.

[0060] 4) Cut to size.

[0061] (2) Preparation of negative electrode sheet

[0062] 1) Afte...

Embodiment 1

[0072] In a glove box filled with argon, LiTFSI and LiPF 6 Dissolve in hydroxyl-terminated oligomer A1 and succinonitrile, stir for 2 hours to dissolve completely, then add terminal isocyanate group-containing compound B1 and porous PMMA particles, stir well, and finally add dibutyltin dilaurate, each The ratio of components is shown in Table 1.

[0073] Quickly inject the mixed electrolyte raw materials into the cell, let it stand for 24 hours, extract excess electrolyte, and then heat at 50°C for 2 hours.

[0074] The long-term cycle performance of the full battery of NCM811 on silicon carbon was tested. When the capacity retention rate decayed to 80%, a total of 850 cycles were cycled.

[0075] Table 1

[0076]

Embodiment 2

[0078] In a glove box filled with argon, the LiDFOB / LiPF 6 Dissolve in hydroxyl-terminated oligomer A2 and succinonitrile, stir for 2 hours to dissolve completely, then add terminal isocyanate group-containing compound B2 and porous PMMA particles, stir well, and finally add dibutyltin dilaurate, each The ratio of components is shown in Table 2.

[0079] Quickly inject the mixed electrolyte into the cell, let it stand for 24 hours, extract the excess electrolyte, and then heat it at 50°C for 2 hours.

[0080] The long-term cycle performance of the full battery of NCM811 on silicon carbon was tested. When the capacity retention rate decayed to 80%, a total of 850 cycles were cycled.

[0081] Table 2

[0082]

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Abstract

The invention relates to a solid-state electrolyte, particularly to a high-cohesiveness solid-state electrolyte prepared through in-situ curing, and a preparation method thereof, and a secondary lithium battery composed of the solid-state electrolyte, wherein the raw materials of the high-cohesiveness solid-state electrolyte mainly consist of a hydroxyl-terminated oligomer, an isocyanate-terminated compound and a lithium salt, and the high-cohesiveness solid-state electrolyte is prepared by uniformly mixing and stirring the hydroxyl-terminated oligomer, the isocyanate-terminated compound and the lithium salt, adding the mixture into a battery core and carrying out in-situ polymerization and curing under a heating condition. According to the invention, the electrolyte prepared by in-situ curing has high adhesive force, and is cured under heating, so that the positive electrode, the negative electrode and the electrolyte are tightly attached, the interface impedance between the electrolyte and the positive electrode and the interface impedance between the electrolyte and the negative electrode are reduced, and the effect of improving the rate capability and the cycle performance of the battery is achieved; and the preparation process of the solid-state lithium battery is greatly simplified, the interface contact is optimized, the danger caused by dislocation is prevented, and thesafety of the battery is improved.

Description

technical field [0001] The invention relates to a solid electrolyte, in particular to a highly cohesive solid electrolyte prepared by in-situ curing, its preparation and its application in secondary lithium batteries. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, low self-discharge rate, and high energy density, so lithium-ion batteries are gradually replacing traditional batteries and expanding their application fields. However, with the continuous improvement of the energy density of lithium-ion batteries and the enlargement of energy storage modules, the potential safety hazards of lithium-ion batteries have always been the primary problem for researchers to solve. Electrolyte is one of the key components of high specific energy secondary lithium batteries. Although the electrode material is a prerequisite for determining the energy density of secondary lithium batteries, the energy density is related to its reaction kinetics, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052H01M10/058C08G18/42C08G18/50C08G18/64
CPCH01M10/0565H01M10/052H01M10/058C08G18/42C08G18/6461C08G18/5015H01M2300/0082Y02P70/50
Inventor 崔光磊丁国梁徐红霞吕照临周倩陈锴
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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