A kind of non-combustible gel polymer electrolyte and its preparation method and application
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A gel polymer and electrolyte technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of lithium battery combustion and explosion, achieve good compatibility, simple preparation process, and easy to achieve effects
Active Publication Date: 2022-05-17
SICHUAN UNIV
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The gel polymer electrolytes prepared above can achieve excellent ionic conductivity (1.3~6.0×10 -3 S cm -1 ), but a large amount of flammable carbonate plasticizers exist in the polymer matrix, so that the lithium battery constructed by this method still has the potential danger of combustion and explosion
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Embodiment 1
[0054] 4g of diethyl vinylphosphonate, 2g of acrylonitrile and 0.76g of LiPF 6 Dissolve in 5.234g EC and DMC (volume ratio 1:1), add 0.006g AIBN, stir until a homogeneous solution is formed, place it at 50°C for in-situ polymerization, and obtain a gel polymer electrolyte after 24 hours.
[0055] The prepared gel polymer is non-combustible in the ignition test, and the ion conductivity at room temperature is 2.5×10 -4 S cm -1 , the lithium ion migration number is 0.66, and the electrochemical window is 5.0V.
Embodiment 2
[0057] 4g of diethyl vinylphosphonate, 2g of acrylonitrile and 0.76g of LiPF 6 Dissolve in 5.234g EC and DMC (volume ratio 1:1), add 0.006g AIBN, stir until a homogeneous solution is formed, place it at 80°C for in-situ polymerization, and obtain a gel polymer electrolyte after 3 hours.
[0058] The prepared gel polymer is non-combustible in the ignition test, and the ion conductivity at room temperature is 2.8×10 -4 S cm -1 , the lithium ion migration number is 0.68, and the electrochemical window is 5.0V.
Embodiment 3
[0060] 4 g of diethyl vinylphosphonate, 2 g of methyl methacrylate and 0.76 g of LiPF 6 Dissolve in 5.234g EC and DMC (volume ratio 1:1), add 0.006g AIBN, stir until a homogeneous solution is formed, place it at 60°C for in-situ polymerization, and obtain a gel polymer electrolyte after 12 hours.
[0061] The prepared gel polymer is non-combustible in the ignition test, and the ion conductivity at room temperature is 1.9×10 -4 S cm -1, the lithium ion migration number is 0.38, and the electrochemical window is 4.2V.
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Abstract
In the non-combustible gel polymer electrolyte disclosed by the present invention, the evenly mixed vinyl phosphorus-containing compound, vinyl compound and lithium salt are firstly dissolved in a plasticizer, then an initiator is added, and poured into a mold to be paved or dropped onto the The separator assembled between the positive and negative electrodes of the battery is wetted, and heated at 50-80°C for 3-24 hours to polymerize the monomers in situ to obtain a non-combustible gel polymer electrolyte. The gel polymer electrolyte has a high phosphorus content, not only cannot be ignited when encountering an open flame, but also has a high ionic conductivity, lithium ion migration number and electrochemical window at room temperature. When applied to lithium batteries, side reactions caused by the migration of vinyl phosphorus-containing compounds can be avoided, and the damage to electrochemical performance can be reduced while achieving non-combustibility.
Description
technical field [0001] The invention belongs to the technical field of polymer electrolyte and its preparation and application, and in particular relates to a non-combustible gel polymer electrolyte prepared by in-situ polymerization, its preparation method and application. Background technique [0002] Due to the advantages of high energy density, no memory effect, and long cycle life, lithium batteries have been widely used in power batteries and electronic products in recent years. With the country's vigorous development and promotion of new energy vehicles, people have higher requirements for the battery life of power vehicles. According to the planning of the national power battery technology roadmap, by 2020, the specific energy of a battery cell will reach 350 Wh / kg. While the energy density of the battery continues to increase, the stability of the battery will decrease. On August 18, 2019, the Battery Safety Laboratory of Tsinghua University released the "2019 Pow...
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