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High-safety solid-state electrolyte, preparation method and application thereof

A solid electrolyte, safe technology, applied in the direction of solid electrolyte, non-aqueous electrolyte, non-aqueous electrolyte battery, etc., can solve problems such as battery damage

Active Publication Date: 2020-11-20
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, flame retardant groups such as cyclic phosphazene and phosphate ester can only play a role in flame retardancy in the gasified state, so polymer electrolytes based on phosphate ester and cyclic phosphazene can only play a role in combustion. Flame retardant, which means that the electrolyte will only exert its flame retardant effect when the battery system has burned, but usually the battery at this time has been completely damaged and is in an extremely high temperature environment

Method used

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  • High-safety solid-state electrolyte, preparation method and application thereof
  • High-safety solid-state electrolyte, preparation method and application thereof
  • High-safety solid-state electrolyte, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0104] Under anhydrous and oxygen-free conditions, 2,3-dihydroxypropyl acrylate, 1,6-hexamethylene diisocyanate and lithium difluorooxalate borate were formulated into a homogeneous solution at a mass ratio of 2:8:2. This solution was then assembled into LiCoO 2 / Li battery, and placed the battery in an incubator at 80°C for 10 hours of polymerization. The thermal decomposition temperature of the electrolyte is as high as 350 °C, and there is no melting point, the assembled LiCoO 2 / Li button battery has a discharge specific capacity of 140mAh / g at 60°C, a discharge specific capacity of 120mAh / g at room temperature, and a discharge specific capacity of 150mAh / g at 120°C. The discharge specific capacity at a high temperature of 150°C drops to 40 mAh / g, and the ionic conductivity of the polymer electrolyte decreases by an order of magnitude compared to that at 100°C.

Embodiment 2

[0106] Under anhydrous and oxygen-free conditions, 2,3-dihydroxypropyl methacrylate, isophorone diisocyanate and lithium bistrifluoromethanesulfonimide were formulated into a homogeneous solution at a mass ratio of 2:8:5 . This solution was then assembled into LiFePO 4 / Li battery, and placed the battery in a thermostat at 60°C for 12 hours to polymerize. The thermal decomposition temperature of the electrolyte is as high as 350 °C, and there is no melting point, the assembled LiFePO 4 / Li button battery has a discharge specific capacity of 150mAh / g at 60°C, a discharge specific capacity of 130mAh / g at room temperature, and a discharge specific capacity of 160mAh / g at 120°C. The discharge specific capacity at a high temperature of 150°C drops to 50 mAh / g, and the ionic conductivity of the polymer electrolyte drops significantly compared to that at 100°C.

Embodiment 3

[0108] Under anhydrous and oxygen-free conditions, hydroxyethyl methacrylate, isophorone diisocyanate, and lithium bistrifluoromethanesulfonimide were formulated into a homogeneous solution at a mass ratio of 2:8:2. This solution was then assembled into LiFePO 4 / Li battery, and placed the battery in a thermostat at 60°C for 10 hours to polymerize. The thermal decomposition temperature of the electrolyte is as high as 350 °C, and there is no melting point, the assembled LiFePO 4 / Li button battery has a discharge specific capacity of 140mAh / g at 60°C, a discharge specific capacity of 120mAh / g at room temperature, and a discharge specific capacity of 150mAh / g at 120°C. The discharge specific capacity at a high temperature of 150°C drops to 50 mAh / g, and the ionic conductivity of the polymer electrolyte drops significantly compared to that at 100°C.

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Abstract

The invention relates to a high-safety solid-state electrolyte and a preparation method thereof, and application in a lithium secondary battery. According to the invention, a solid-state electrolyte precursor solution comprises a lithium salt, an isocyanate-containing compound and a hydroxyl-containing polymer monomer, a solid-state electrolyte is obtained by polymerizing the precursor solution, the polymerization temperature ranges from 20 DEG C to 80 DEG C, the solid-state electrolyte precursor solution further comprises one or more of a plasticizer, an active monomer, an initiator and a catalyst, and the solid-state electrolyte contains polymerizable groups, and can be subjected to a polymerization reaction at a temperature higher than 100 DEG C to form a polymer with a cross-linked network structure, so that the lithium battery does not generate internal short circuit under extremely high temperature conditions such as heat abuse and the like, and the safety performance of the lithium battery is improved.

Description

technical field [0001] The invention belongs to the technical field of solid electrolytes, and in particular relates to a high-safety solid electrolyte, a preparation method thereof, and an 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. Among them, since lithium hexafluorophosphate will decompose above 60°C, carbonate solvents such as dimethyl carbonate are low flash point and volatile organic solvents, which limit the operating temperature range of lithium batteries and seriously affect the high temperature safety of lithium batteries. Performance, which in turn hinders the lar...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/052C08G18/67C08G18/73C08G18/75C08G18/76
CPCH01M10/0565H01M10/052C08G18/73C08G18/755C08G18/7664C08G18/7614C08G18/672H01M2300/0082Y02E60/10
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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