Diene/ether copolymer-based lithium ion gel electrolyte membrane and preparation method thereof

A technology of gel electrolyte and copolymer membrane, which is applied in the direction of circuits, electrical components, secondary batteries, etc., can solve the problems of low conductivity of gel electrolyte membrane, complex preparation process of electrolyte membrane, large-scale production and use, etc. Achieve the effects of increasing absorption and gelation, improving storage capacity and mechanical strength, and high polymer conversion rate

Inactive Publication Date: 2011-05-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although moderate cross-linking can improve the strength of the final electrolyte membrane, in this method, methyl methacrylate, acrylonitrile, etc. are used in the non-optimal lithium ion gel matrix, so the conductivity of the gel electrolyte membrane after lithium salt activation rate is still relatively low
Chinese patent CN101381429 discloses a self-supporting lithium-ion battery gel polymer electrolyte / its special polymer and its preparation, wherein a ternary polymer obtained by emulsion polymerization of methyl methacrylate, acrylonitrile and vinyl acetate monomers is used The polymer is used as the matrix of the membrane, and the prepared lithium-ion electrolyte membrane has high conductivity and an appropriate electrochemical stability window, but it is still a non-crosslinked system, and strength and structural stability during use are still potential problems
In the polymer electrolyte and polymer lithium battery disclosed in U.S. Patent US20030409065, it is mentioned that the introduction of matrix polymer and branched polymer or hyperbranched polymer can improve its electrical conductivity, but it still belongs to the binary matrix system, and the matrix polymer There is still a non-chemically bonded two-phase structure with branched / hyperbranched polymers. This structure will be destroyed at higher temperatures during use, so the reliability of application performance is relatively low. At the same time, this hinders the electrolyte membrane preparation process. Complex, large-scale production and use are relatively difficult

Method used

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  • Diene/ether copolymer-based lithium ion gel electrolyte membrane and preparation method thereof
  • Diene/ether copolymer-based lithium ion gel electrolyte membrane and preparation method thereof
  • Diene/ether copolymer-based lithium ion gel electrolyte membrane and preparation method thereof

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preparation example Construction

[0047] The steps of the preparation method of the lithium ion gel electrolyte membrane based on diene / ether copolymer are as follows:

[0048] 1) dissolving the diene / ether copolymer with a mass percentage of 20-80% and the initiator with a mass percentage of 0.1-1% in an organic solvent of 19-79.9% to prepare a film-forming solution;

[0049] 2) Scrape the film-making solution directly on a stainless steel or glass plane carrier to form a liquid film with a thickness of 20-50 microns, and obtain a cross-linkable diene / ether copolymer film after the solvent evaporates;

[0050] 3) Heating or irradiating the cross-linkable diene / ether copolymer film for 5-60 minutes, so that the intermolecular double bonds of the copolymer are cross-linked and cured into a diene / ether copolymer gel matrix film, and the heating temperature 50-100°C, UV irradiation power of 100w, to obtain a cross-linked diene / ether copolymer gel matrix film

[0051] 4) In an anhydrous and oxygen-free environmen...

Embodiment 1

[0064] The steps of the preparation method of the lithium ion gel electrolyte membrane based on diene / ether copolymer are as follows:

[0065] 1) dissolving the diene / ether triblock copolymer with a mass percentage of 20% and the initiator with a mass percentage of 0.1% in an organic solvent of 79.9% to make a film-forming solution;

[0066] 2) Scrape the film-making liquid directly on a stainless steel or glass plane carrier to form a liquid film with a thickness of 31 microns, and obtain a cross-linkable diene / ether copolymer film after the solvent evaporates;

[0067]3) Heat the cross-linkable diene / ether copolymer film or irradiate it with ultraviolet light for 20 minutes, so that the intermolecular double bonds of the copolymer are cross-linked and cured to form a diene / ether copolymer gel matrix film, and the heating temperature is 100°C , the UV irradiation power is 100w to obtain a cross-linked diene / ether copolymer gel matrix film;

[0068] 4) In an anhydrous and oxy...

Embodiment 2

[0074] The steps are the same as in Example 1, and the various implementation conditions and the structure and performance of the obtained diene / ether copolymer-based lithium ion gel electrolyte membrane are shown in Table 2.

[0075] Table 2

[0076]

[0077]

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Abstract

The invention discloses a diene / ether copolymer-based lithium ion gel electrolyte membrane and a preparation method thereof. The lithium ion electrolyte membrane provided by the invention consists of cross-linked diene / ether copolymer, lithium salt and plasticizing agent, and the preparation method of the lithium ion electrolyte membrane comprises the following steps of: firstly, adopting a blocktype diene / polyether copolymer containing a poly-butadiene or polyprene chain segment and a polyethylene oxide or polypropylene oxide chain segment to form a membrane with the assistance of a solvent; secondly, performing crosslinking to form a gel membrane under the action of ultraviolet, heating or an initiating agent; and finally, swelling and activating the gel membrane by using a plasticizing agent and lithium salt solution to obtain the lithium ion gel electrolyte membrane. The prepared lithium ion gel electrolyte membrane has a two-phase micro-phase separation structure of polyolefin and polyether, wherein a diene polymer chain segment forms a cross-linked structure to improve the strength of the membrane, and a polyether phase absorbed plasticizing agent and the lithium salt provide a lithium ion transmission channel. The electrolyte membrane provided by the invention has the characteristic of high electrical conductivity and can be strengthened by using a non-woven cloth and the like, so the electrolyte membrane is suitable to be used as an electrolyte membrane material of power lithium ion batteries.

Description

technical field [0001] The invention relates to a gel-state electrolyte membrane for lithium-ion batteries and a preparation process thereof, in particular to a diene / ether copolymer-based lithium-ion gel electrolyte membrane and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of high-energy battery. Compared with traditional lead-acid batteries, nickel-metal hydride and nickel-cadmium batteries, lithium-ion batteries have the advantages of high voltage, long cycle life, large specific energy, and fast charging and discharging. According to the electrolyte, lithium-ion batteries can be divided into two categories: liquid lithium-ion batteries and polymer lithium-ion batteries. However, in practical applications, liquid lithium-ion batteries are prone to decomposition and generation of gas due to high voltage or overcharging, which will cause the battery to expand and deform, and may also cause an explosion; and it is easy to caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565
CPCY02E60/12Y02E60/10
Inventor 朱宝库王婷姚之侃李浩朱利平
Owner ZHEJIANG UNIV
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