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Flame-retardant polymer gel electrolyte, preparation method thereof and lithium battery

A flame retardant polymer, gel electrolyte technology, applied in non-aqueous electrolyte battery, electrolyte battery manufacturing, electrolyte immobilization/gelation and other directions, can solve the problems of easy decomposition, strong fluidity, low flash point, etc. Achieve the effect of improving cycle stability and improving flame retardant performance

Inactive Publication Date: 2019-04-23
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most commercial lithium batteries currently use liquid organic electrolytes. Due to their low flash point, low vapor pressure, strong fluidity, and easy leakage, and their low decomposition voltage, they are prone to decomposition under high pressure, and even combustion and explosion. etc., there is a very big safety hazard, which also limits its application in energy storage devices

Method used

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  • Flame-retardant polymer gel electrolyte, preparation method thereof and lithium battery
  • Flame-retardant polymer gel electrolyte, preparation method thereof and lithium battery
  • Flame-retardant polymer gel electrolyte, preparation method thereof and lithium battery

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preparation example Construction

[0032] The embodiment of the present invention provides the preparation method of the flame-retardant polymer gel electrolyte as described above, such as figure 1 Shown, described preparation method comprises steps:

[0033] S10, adding the lithium salt to the phosphate ester solvent and stirring to form a basic electrolyte.

[0034] In a specific solution, when lithium salt is added to the phosphate ester solvent, it is stirred at a temperature of 15° C. to 25° C. for 0.5 to 3 hours to completely dissolve the lithium salt and form a basic electrolyte with a high salt solubility ratio. Preferably, the molar concentration of the lithium salt in the basic electrolyte is 3-7 mol / L.

[0035] S20, adding methyl methacrylate to the basic electrolyte and stirring to form a first solution.

[0036] In a specific scheme, when methyl methacrylate is added to the basic electrolyte, it is stirred at a temperature of 15° C. to 25° C. for 0.5 to 2 hours, so that the methyl methacrylate is...

Embodiment 1

[0044] The flame retardant polymer gel electrolyte provided in this embodiment includes the following components by weight ratio: 71.33% of basic electrolyte, 28.53% of methyl methacrylate and 0.14% of azobisisobutyronitrile, through heat treatment The above components are polymerized in situ to form the flame retardant polymer gel electrolyte. Wherein, the basic electrolyte is a basic electrolyte formed by dissolving lithium bis(fluorosulfonyl)imide in trimethyl phosphate solvent, and in the basic electrolyte, the molar fraction of lithium bis(fluorosulfonyl)imide is 7mol / L.

[0045] The preparation method of the flame retardant polymer gel electrolyte in this embodiment is as follows:

[0046] (1) Dissolve 3.3 g of lithium bis(fluorosulfonyl)imide in 2.5 mL of trimethyl phosphate solvent, and stir at 20°C for 1 h until the lithium bis(fluorosulfonyl)imide is completely dissolved A basic electrolyte with a high concentration of lithium salt is formed. In the basic electrol...

Embodiment 2

[0052] The flame retardant polymer gel electrolyte provided by this embodiment includes the following components by weight ratio: 71.23% of basic electrolyte, 28.49% of methyl methacrylate and 0.28% of azobisisobutyronitrile, through heat treatment The above components are polymerized in situ to form the flame retardant polymer gel electrolyte. Wherein, the basic electrolyte is a basic electrolyte formed by dissolving lithium bistrifluoromethanesulfonylimide in a triethyl phosphate solvent, and in the basic electrolyte, the molar fraction of lithium bistrifluoromethanesulfonylimide is 5mol / L.

[0053] The preparation method of the flame retardant polymer gel electrolyte in this embodiment is as follows:

[0054] (1) Dissolve 2.3 g of lithium bistrifluoromethanesulfonyl imide in 2.5 mL of triethyl phosphate solvent, and stir at a temperature of 15° C. for 3 h until the lithium bistrifluoromethanesulfonyl imide is completely dissolved A basic electrolyte with a high concentra...

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Abstract

The invention discloses a flame-retardant polymer gel electrolyte. The flame-retardant polymer gel electrolyte comprises a basic electrolyte formed by dissolving a lithium salt in a phosphate solvent,methyl methacrylate and a thermal initiator, wherein the above materials are polymerized in situ. The preparation method of the flame-retardant polymer gel electrolyte comprises the following steps:S10, adding a lithium salt into a phosphate solvent, stirring and mixing to form a basic electrolyte; S20, adding methyl methacrylate into the basic electrolyte, stirring and mixing to form a first solution; S30, adding a thermal initiator into the first solution, stirring and mixing to form a second solution; S40, carrying out heating treatment on the second solution to polymerize each componentin the second solution in situ, so as to obtain the flame-retardant polymer gel electrolyte. When the flame-retardant polymer gel electrolyte provided by the invention is applied to the lithium battery, the flame retardancy of the lithium battery can be improved. The cycling stability of the lithium battery can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a flame-retardant polymer gel electrolyte and a preparation method thereof, and also relates to a lithium battery containing the flame-retardant polymer gel electrolyte. Background technique [0002] Lithium batteries have the advantages of wide operating temperature range, stable discharge voltage, low self-discharge rate, and long service life. They have been widely used in various fields, especially aerospace, military, long-life instrumentation, logistics tracking, automotive electronics, Mobile digital products and other fields. [0003] Lithium batteries are usually composed of positive electrodes, negative electrodes, separators, electrolytes, and structural shells. Electrolyte, as one of its most important components, not only plays the role of ion transport between electrodes, but also determines the use voltage, cycle performance, safety performan...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/0525C08F120/14
CPCC08F120/14H01M10/0525H01M10/0565H01M10/058H01M2300/0085Y02E60/10Y02P70/50
Inventor 陈佳华陆子恒羿井司杨铮杨春雷
Owner SHENZHEN INST OF ADVANCED TECH
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