A kind of high safety solid state electrolyte and its preparation method and application

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, achieve the effect of preventing deterioration, improving interface impedance, and preventing short circuit in the battery

Active Publication Date: 2022-05-10
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of high safety solid state electrolyte and its preparation method and application
  • A kind of high safety solid state electrolyte and its preparation method and application
  • A kind of high safety solid state electrolyte and its preparation method and application

Examples

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Effect test

Embodiment 1

[0104] Under the condition of no water or oxygen, 2,3-Dihydroxypropyl acrylate, 1,6-hexandiisocyanate and lithium difluoroacetate borate were prepared into a homogeneous solution according to the mass ratio of 2:8:2. The solution was then assembled into LiCoO 2 / Li battery and place the battery in a thermostat at 80 ℃ for polymerization for 10 hours. The thermal decomposition temperature of the electrolyte is as high as 350 ℃, and there is no melting point. The assembled LiCoO 2 / The specific discharge capacity of Li button battery is 140 MAH / g at 60 ℃, 120 MAH / g at room temperature and 150 MAH / g at 120 ℃. The specific discharge capacity at 150 ℃ is reduced to 40 MAH / g, and the ionic conductivity of polymer electrolyte is one order of magnitude lower than that at 100 ℃.

Embodiment 2

[0106] Under the condition of no water or oxygen, 2,3-Dihydroxypropyl methacrylate, isoflurone diisocyanate and lithium trifluoromethylsulfonimide were prepared into a homogeneous solution according to the mass ratio of 2:8:5. The solution was then assembled into LiFePO 4 / Li battery and place the battery in a thermostat at 60 ℃ for polymerization for 12 hours. The assembly temperature of LiFePO is 350 ℃, and there is no thermal decomposition of LiFePO 4 / The specific discharge capacity of Li button battery is 150mah / g at 60 ℃, 130mah / g at room temperature and 160mah / g at 120 ℃. The specific discharge capacity at 150 ℃ is reduced to 50 MAH / g, and the ionic conductivity of polymer electrolyte is significantly lower than that at 100 ℃.

Embodiment 3

[0108] Under the condition of no water or oxygen, hydroxyethyl methacrylate, isoflurone diisocyanate and lithium trifluoromethylsulfonimide were prepared into a homogeneous solution according to the mass ratio of 2:8:2. The solution was then assembled into LiFePO 4 / Li battery and place the battery in a thermostat at 60 ℃ for polymerization for 10 hours. The thermal decomposition temperature of the electrolyte is as high as 350 ℃, and there is no melting point. LiFePO is assembled 4 / The specific discharge capacity of Li button battery is 140 MAH / g at 60 ℃, 120 MAH / g at room temperature and 150 MAH / g at 120 ℃. The specific discharge capacity at 150 ℃ is reduced to 50 MAH / g, and the ionic conductivity of polymer electrolyte is significantly lower than that at 100 ℃.

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Abstract

The invention relates to a high-safe solid state electrolyte, a preparation method thereof and an application in lithium secondary batteries. The solid electrolyte precursor solution includes a lithium salt, an isocyanate-containing compound and a polymer monomer containing a hydroxyl group. The solid electrolyte is obtained by polymerization of the precursor solution, and the polymerization temperature range is 20-80°C. The solid electrolyte precursor solution also includes one or more of plasticizers, active monomers, initiators and catalysts. The solid electrolyte contains polymerizable groups, which can undergo a polymerization reaction at a temperature higher than 100°C to form a polymer with a cross-linked network structure, so that the lithium battery does not have an internal short circuit under extreme high temperature conditions such as thermal abuse, and improves the lithium battery. Battery safety performance.

Description

technical field [0001] The invention belongs to the technical field of solid electrolyte, in particular to a high safety solid electrolyte and its preparation method and application in secondary lithium battery. Background technology [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 vinyl carbonate, dimethyl carbonate, diethyl carbonate and lithium hexafluorophosphate. Among them, lithium hexafluorophosphate will decompose above 60 ℃, and carbonate solvents such as dimethyl carbonate are low flash point and volatile organic solvents, which limits the service temperature range of lithium batteries and seriously affects the high-temperature safety performance of lithium batteries, thus hindering the large-scale application of secondary lithiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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