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 combustio

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

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0103] Example 1

[0104] Under anhydrous and oxygen-free conditions, 2,3-dihydroxypropyl acrylate, 1,6-hexamethylene diisocyanate and lithium difluorooxalate borate were prepared into a homogeneous solution in a mass ratio of 2:8:2. This solution was then assembled to LiCoO 2 / Li battery, and the battery was placed 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 specific discharge capacity of 140mAh / g at 60℃, a specific discharge capacity of 120mAh / g at room temperature, and a specific discharge capacity of 150mAh / g at 120℃. The discharge specific capacity at a high temperature of 150 °C drops to 40 mAh / g, and the ionic conductivity of the polymer electrolyte is reduced by an order of magnitude compared to that at 100 °C.

Example Embodiment

[0105] Example 2

[0106] Under anhydrous and oxygen-free conditions, 2,3-dihydroxypropyl methacrylate, isophorone diisocyanate and lithium bis-trifluoromethanesulfonimide were prepared into a homogeneous solution in a mass ratio of 2:8:5 . This solution was then assembled to LiFePO 4 / Li cells, and the cells were placed in an incubator at 60 °C for 12 h of polymerization. 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 specific discharge capacity of 150mAh / g at 60℃, a specific discharge capacity of 130mAh / g at room temperature, and a specific discharge capacity of 160mAh / g at 120℃. The discharge specific capacity at a high temperature of 150 °C dropped to 50 mAh / g, and the ionic conductivity of the polymer electrolyte decreased significantly compared with that at 100 °C.

Example Embodiment

[0107] Example 3

[0108] Under anhydrous and anaerobic conditions, hydroxyethyl methacrylate, isophorone diisocyanate and lithium bis-trifluoromethanesulfonimide were prepared into a homogeneous solution in a mass ratio of 2:8:2. This solution was then assembled to LiFePO 4 / Li battery, and the battery was placed in an incubator at 60 °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 LiFePO 4 / Li button battery has a specific discharge capacity of 140mAh / g at 60℃, a specific discharge capacity of 120mAh / g at room temperature, and a specific discharge capacity of 150mAh / g at 120℃. The discharge specific capacity at a high temperature of 150 °C dropped to 50 mAh / g, and the ionic conductivity of the polymer electrolyte decreased significantly compared with 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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