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Self-repairing polymer electrolyte based on dynamic chemical bonds and application thereof in secondary lithium battery

A technology of polymers and electrolytes, applied in non-aqueous electrolyte batteries, electrolyte battery manufacturing, secondary batteries, etc., can solve problems such as improvement, degradation of polymer electrolyte oxidation stability, and limitation of energy density of lithium batteries

Active Publication Date: 2020-05-15
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, the addition of electrolyte will bring safety hazards similar to liquid electrolyte to the battery.
CN109659605A discloses a polymer electrolyte based on the Diels-Alder reaction, but because the oxidation decomposition potential of the furan and maleimide groups introduced by the Diels-Alder reaction is too low, the polymer electrolyte can only be applied to iron phosphate In battery systems with low charging platforms such as lithium, the improvement of battery energy density is limited
In addition, the introduction of hydrogen bonds will also lead to a decrease in the oxidation stability of the polymer electrolyte, which limits the energy density of lithium batteries.
So far, there are no reports on high-voltage window self-healing polymer electrolytes

Method used

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  • Self-repairing polymer electrolyte based on dynamic chemical bonds and application thereof in secondary lithium battery
  • Self-repairing polymer electrolyte based on dynamic chemical bonds and application thereof in secondary lithium battery
  • Self-repairing polymer electrolyte based on dynamic chemical bonds and application thereof in secondary lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] Under anhydrous and oxygen-free conditions, the Dissolve in N,N-dimethylacetamide and stir evenly, then add lithium difluorooxalate borate and dibutyltin dilaurate into the solution and stir until completely dissolved, in which polymer, lithium difluorooxalate borate and dilaurate The mass ratio of dibutyltin acid is 9:1:0.1. Then the solution was poured evenly on the tetrafluoro plate, and dried in a vacuum oven at 60° C. for 24 hours to obtain a PT-1 polymer solid electrolyte film. In order to observe the self-healing of the polymer electrolyte, the PT-1 film was first cut into two sections, and then placed under a microscope to observe the self-healing phenomenon of PT-1. It was found by optical microscope observation that the cuts in the PT-1 polymer electrolyte film disappeared within 1 min, showing excellent self-healing characteristics.

Embodiment 2

[0126] Under anhydrous and oxygen-free conditions, the Dissolve in N,N-dimethylacetamide and stir evenly, then add lithium bistrifluoromethylsulfonylimide and stannous octoate into the solution and stir until completely dissolved, in which the polymer, bistrifluoromethyl The mass ratio of lithium sulfonylimide to stannous octoate is 10:2:0.2. Then the solution was uniformly poured on the cellulose separator, and dried in a vacuum oven at 60° C. for 24 hours to obtain a PT-2 polymer solid electrolyte film. To evaluate the oxidation stability of the polymer electrolyte and its compatibility with high-voltage cathodes, PT-2 was assembled into LiCoO 2 / Li battery, then LiCoO 2 / Li battery is charged and discharged at a high voltage with a cut-off voltage of 4.4V, and the battery is subjected to a 180-degree bending test. The LiCoO 2 The discharge specific capacity of the / PT-2 / Li battery during the bending test is 140mAh / g, indicating that the battery can still maintain norma...

Embodiment 3

[0128] Under anhydrous and oxygen-free conditions, the Dissolve in N,N-dimethylacetamide and stir evenly, then add lithium bisfluorosulfonimide and dibutyltin dilaurate into the solution and stir until completely dissolved, in which polymer, bisfluorosulfonimide The mass ratio of lithium and dibutyltin dilaurate is 10:5:0.4. Then the solution was poured evenly on the tetrafluoro board, and dried in a vacuum oven at 60° C. for 24 hours to obtain a PT-3 polymer solid electrolyte film. To evaluate the oxidation stability of the polymer electrolyte and its compatibility with high-voltage cathodes, PT-3 was assembled into LiCoO 2 / Li battery, then LiCoO 2 The / Li battery is charged and discharged at a high voltage with a cut-off voltage of 4.5V. The LiCoO 2 The / PT-3 / Li battery can release a specific capacity of 180mAh / g at the 10th cycle, and can still release a specific capacity of 170mAh / g after 100 cycles.

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Abstract

The invention relates to polymer electrolyte, in particular to a self-repairing polymer electrolyte based on dynamic chemical bonds and the application of the self-repairing polymer electrolyte in a secondary lithium battery. The electrolyte comprises a lithium salt, a polymer containing the dynamic chemical bonds and a catalyst. On one hand, the self-repairing polymer electrolyte has a rapid andefficient self-repairing function, can bear the volume deformation of the battery in a large-current charging and discharging process, repairs an interface between the electrolyte and an electrode, and prolongs the service life of the battery, and on the other hand, compared with a hydrogen bond-based self-repairing polymer electrolyte, the electrolyte has a higher electrochemical window, can be used in a high-voltage lithium battery, and effectively improves the energy density of the lithium battery.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a self-repairing polymer electrolyte based on dynamic chemical bonds and its application in secondary lithium batteries. Background technique [0002] In recent years, with the rapid development of new energy electric vehicles, people have higher and higher requirements for the energy density and safety performance of secondary lithium batteries. At present, the commercial secondary lithium battery electrolyte is mainly composed of ethylene carbonate, dimethyl carbonate, diethyl carbonate and lithium hexafluorophosphate. However, under high current density charging and discharging conditions, flammable carbonate solvents and easily decomposed lithium hexafluorophosphate pose serious safety hazards to lithium batteries. Compared with commercial carbonate electrolytes, solid-state electrolytes have higher safety performance. However, the insufficient contact...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/052H01M10/058H01M10/42
CPCH01M10/0565H01M10/052H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 崔光磊周倩吕照临丁国梁徐红霞
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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