Non-combustible gel polymer electrolyte as well as preparation method and application thereof
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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 problems such as combustion and explosion of lithium batteries
Active Publication Date: 2020-06-09
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
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[0053] Example 1
[0054] Combine 4g diethyl vinylphosphonate, 2g acrylonitrile and 0.76g LiPF 6 Dissolve in 5.234g EC and DMC (volume ratio 1:1), add 0.006g AIBN, stir until a homogeneous solution is formed, and place it at 50°C for in-situ polymerization. After 24 hours, a gel polymer electrolyte is obtained.
[0055] The prepared gel polymer is non-flammable after ignition test, and the room temperature ion conductivity is 2.5×10 -4 S cm -1 , The lithium ion migration number is 0.66, and the electrochemical window is 5.0V.
Example Embodiment
[0056] Example 2
[0057] Combine 4g diethyl vinylphosphonate, 2g acrylonitrile and 0.76g LiPF 6 Dissolve in 5.234g EC and DMC (volume ratio 1:1), add 0.006g AIBN, stir until a homogeneous solution is formed, and place it at 80°C for in-situ polymerization. After 3h, a gel polymer electrolyte is obtained.
[0058] The prepared gel polymer is non-flammable after ignition test, and the room temperature ion conductivity is 2.8×10 -4 S cm -1 , The lithium ion migration number is 0.68, and the electrochemical window is 5.0V.
Example Embodiment
[0059] Example 3
[0060] Combine 4g vinyl diethyl phosphonate, 2g methyl methacrylate and 0.76g LiPF 6 Dissolve in 5.234g EC and DMC (volume ratio 1:1), add 0.006g AIBN, stir until a homogeneous solution is formed, and place it at 60°C for in-situ polymerization. After 12 hours, a gel polymer electrolyte is obtained.
[0061] The prepared gel polymer is non-flammable after ignition test, and the room temperature ion conductivity 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
The invention discloses a non-combustible gel polymer electrolyte. The non-combustible gel polymer electrolyte is prepared by the steps: dissolving a vinyl phosphorus-containing compound, a vinyl compound and a lithium salt which are uniformly mixed into a plasticizer; and then adding an initiator, pouring into a mold, flattening or dropwise adding into a diaphragm assembled between a positive electrode and a negative electrode of a battery to infiltrate the diaphragm, and heating at the temperature of 50-80 DEG C for 3-24 h to polymerize the monomer in situ, and thus obtaining the non-combustible gel polymer electrolyte. The gel polymer electrolyte has relatively high phosphorus content, cannot be ignited when meeting open fire, and also has relatively high ionic conductivity, lithium iontransference number and electrochemical window at room temperature. When the electrolyte is applied to a lithium battery, side reaction caused by migration of a vinyl phosphorus-containing compound can be avoided, and damage to electrochemical performance can be reduced while incombustibility is achieved.
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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