Preparation method of all-solid-state polymer electrolyte

An all-solid-state polymer and electrolyte technology, applied in the direction of electrolyte immobilization/gelation, circuits, electrical components, etc., can solve the problem of unsuitable use of high-voltage cathode material systems, the low electrochemical window of all-solid polymer electrolytes, and the inability to The combination of high-voltage cathode material system and other issues can achieve the effects of good mechanical processing performance, high electrochemical stability and good mechanical properties.

Active Publication Date: 2018-12-18
ZHUHAI COSMX BATTERY CO LTD
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Problems solved by technology

The Chinese invention patent with the notification number CN103500845B discloses a preparation method of a crosslinked all-solid polymer electrolyte material, which is mainly composed of polyoxyethylene ether, lithium salt, modifier, etc. Ether is cross-linked to form a film, but the cross-linked all-solid polymer electrolyte has relatively low lithium ion conductivity at room temperature and poor electrochemical stability, so it cannot be matched with a high-voltage positive electrode material system
The Chinese invention patent application with publication number CN106684444A discloses a cross-linked all-solid polymer electrolyte containing chitosan, which absorbs polyethers, polyamines, polysulfides, lithium salts, etc. on chitosan In a three-dimensional tunnel, chitosan is used as a monomer to carry out cross-linking polymerization to form a network structure with multiple micro-nano-scale holes, but the electrochemical window of the all-solid polymer electrolyte in this system is low, and it is not suitable for high-voltage cathode materials. System collocation

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[0024] The preparation method of the all-solid polymer electrolyte of the present invention comprises the following steps:

[0025] S1. Combine 1-10 parts by mass of carbonic acid structure crosslinking agent, 70-95 parts by mass of polyether structural monomer, 0-2 parts by mass of alkene monomer, and 0-5 parts by mass of functional polymer together with solvent Add to the reactor, continue to flow nitrogen into the reactor, and keep stirring at a speed of 100-500r / min for 1h-5h to form a uniform precursor solution;

[0026] The carbonic acid structure cross-linking agent in this step is to have the polymeric monomer of carbonic acid structure and polymerizable polyene group at the same time, and its structural formula is as follows:

[0027] Among them, R1, R2, R3, R4 are C x h y o z , x, y, z∈integer, and x≥0, y≥0, z≥0;

[0028] The carbonic acid structure crosslinking agent can specifically be bis(vinyl)carbonate, 2-ethoxycarbonyloxyethyl-2-methylpropyl-2-enoate, 2-p...

Embodiment 1

[0041] S1, the bis (vinyl) carbonate of 6 mass parts, the polyethylene glycol methyl ether methacrylate (molecular weight 300) of 70 mass parts, the acrylic acid of 1 mass part, the polyvinylidene fluoride and tetrahydrofuran of 1 mass part Add to the reactor, continue to pass nitrogen into the reactor and continue to stir at a speed of 100r / min for 1h to obtain a uniform precursor solution;

[0042] S2. Add 0.1 parts by mass of 2-hydroxy-2-methyl-1-phenylmethanone, 10 parts by mass of lithium bisoxalate borate and 5 parts by mass of methoxypolyethylene glycol boric acid Esters were continuously stirred at a speed of 200r / min for 2h to obtain a mixed solution, and the mixed solution was evenly coated on the mold, and after the solvent was evaporated, an ultraviolet lamp was used to initiate the reaction under an inert gas, and the initiation time was 300min; In addition to the light-induced reaction, thermal initiation can also be used. The temperature of thermal initiation is...

Embodiment 2

[0046] S1, 1 mass part of 2-ethoxycarbonyloxyethyl-2-methylpropyl-2-enoic acid ester, 80 mass parts of polyethylene glycol methyl ether methacrylate (molecular weight 20000), 2 mass parts Parts of polyethylene oxide (molecular weight: 5,000,000) and methylpyrrolidone were added to the reactor, nitrogen was continuously passed into the reactor and stirred at a speed of 200r / min for 2h to obtain a uniform precursor solution;

[0047] S2. Add 0.5 parts by mass of 4-methylbenzophenone, 3 parts by mass of nano-silicon dioxide, 2 parts by mass of lithium tantalate, and 40 parts by mass of bistrifluoromethanesulfonyl to the precursor solution Lithium amine, 20 mass parts of malonate lithium oxalate borate, 5 mass parts of methoxy polyethylene glycol aluminate, 3 mass parts of succinonitrile, 2 mass parts of ethylene carbonate, with 500r / Continue stirring at a speed of min for 4 hours to obtain a mixed solution. Spread the mixed solution evenly on the mold, evaporate the solvent, and...

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Abstract

The preparation method of an all-solid-state polymer electrolyte comprises the following steps: adding a carbonic acid structure crosslinking agent, a polyether structure monomer, an olefine acid monomer and a functional polymer together with a solvent into a reactor for stirring to form a uniform precursor solution; Adding an initiator, a lithium salt, an inorganic filler and/or a fast ionic conductor to the precursor solution, stirring to obtain a mixed solution, uniformly coating the mixed solution on a mold, evaporating the solvent, and initiating a reaction under an inert gas; At that endof the initiation reaction, vacuum dry is carried out to obtain an all-solid polymer electrolyte. As that carbonate polyalkenyl structure monome is used as a crosslink agent, the polyether monomer and the olefine acid monomer are crosslinked and copolymerize, and the electrochemical window of the all-solid-state polymer electrolyte can be effectively improved by introducing the carbonate crosslinking structure, and the all-solid-state polymer battery with higher energy density and a better application range can be assembled.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of an all-solid polymer electrolyte. Background technique [0002] Lithium-ion batteries have the characteristics of long service life and high energy density, and have been widely used in new energy vehicles and consumer electronics. Lithium-ion batteries are mainly composed of positive and negative electrodes, diaphragms and electrolytes. Since the electrolyte is in liquid form, it is prone to safety problems such as leakage and explosion, which reduces the safety performance of the battery. Lithium-ion batteries using solid-state electrolytes can solve the safety problems caused by liquid electrolytes. Currently, the solid-state electrolytes used in lithium-ion batteries mainly include oxides, sulfides, and polymer systems. Due to the low conductivity of oxide electrolytes and the interface contact Poor, and sulfide electrolytes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0085Y02E60/10
Inventor 唐伟超李素丽赵伟李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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