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Double-polymer composite solid electrolyte and in-situ preparation method thereof, and double-polymer composite solid electrolyte membrane and in-situ preparation method thereof

A solid-state electrolyte, dual-polymer technology, applied in the field of lithium-ion batteries, can solve the problem of uneven performance of polymer solid-state electrolytes such as ionic conductivity, electrochemical window mechanical strength, etc., restricting the large-scale application of polymer electrolytes, and heterogeneous interfaces. Poor contact and other problems, to achieve the effect of improving room temperature conductivity, broadening the electrochemical window, and improving mechanical strength

Active Publication Date: 2019-10-15
TIANJIN LISHEN BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the ionic conductivity, electrochemical window, mechanical strength and other properties of polymer solid electrolytes are uneven. In addition, the problem of poor contact between heterogeneous interfaces in polymer solid electrolytes has always restricted the large-scale application of polymer electrolytes. one of the key issues of

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  • Double-polymer composite solid electrolyte and in-situ preparation method thereof, and double-polymer composite solid electrolyte membrane and in-situ preparation method thereof
  • Double-polymer composite solid electrolyte and in-situ preparation method thereof, and double-polymer composite solid electrolyte membrane and in-situ preparation method thereof
  • Double-polymer composite solid electrolyte and in-situ preparation method thereof, and double-polymer composite solid electrolyte membrane and in-situ preparation method thereof

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preparation example Construction

[0059] see figure 1 , in order to prepare the above-mentioned dual polymer composite solid electrolyte, the present invention provides an in-situ preparation method of a dual polymer composite solid electrolyte, using dual in-situ polymerization synergies to prepare a dual polymer composite solid electrolyte, Specifically include the following steps:

[0060] The first step, the polymer monomer 2-cyano-ethyl acrylate is dissolved in a volatile small molecule solvent to prepare the first polymer monomer solution;

[0061] In the second step, the polymer monomer 1,3-dioxolane is dissolved in a volatile small molecule solvent to prepare a second polymer monomer solution;

[0062] The third step is to dissolve the polymerization initiator and lithium salt in a volatile small molecule solvent to prepare a polymerization initiation solution;

[0063] In the fourth step, the first polymer monomer solution obtained in the first step is mixed with the second polymer monomer solution ...

Embodiment 1

[0100]In Example 1, the in-situ preparation method of a dual-polymer composite solid electrolyte membrane provided by the present invention specifically includes the following steps:

[0101] The first step, prepare polymer monomer 2-ethyl cyanoacrylate solution (i.e. the first polymer monomer solution) 100g, wherein, containing 80g polymer monomer 2-ethyl cyanoacrylate, and 20g small molecule solvent DMC, to be used.

[0102] The second step, prepare polymer monomer 1,3-dioxolane solution (i.e. the second polymer monomer solution) 100g, wherein, containing 80g polymer monomer 1,3-dioxolane, and 20g small Molecular solvent DMC, ready for use.

[0103] The third step, the polymerization initiator aluminum trifluoromethanesulfonate Al (OTf) 3 、LiPF 6 Dissolved in DMC, prepared as a polymerization initiator solution, aluminum trifluoromethanesulfonate Al(OTf) 3 At a concentration of 0.02M, LiPF 6 The mass percentage is 20%, stand-by.

[0104] The fourth step, according to t...

Embodiment 2

[0109] In Example 2, the present invention provides a method for in-situ preparation of a dual-polymer composite solid electrolyte membrane, which specifically includes the following steps:

[0110] The first step is to take 100 g of the polymer monomer 2-cyanoacrylate ethyl ester solution (ie, the first polymer monomer solution) for use.

[0111] The second step, prepare polymer monomer 1,3-dioxolane solution (i.e. the second polymer monomer solution) 100g, wherein, containing 20g polymer monomer 1,3-dioxolane, and 80g small Molecular solvent DMC, ready for use.

[0112] The third step, the polymerization initiator azobisisobutyronitrile, LiPF 6 Dissolved in DMC, prepared as a polymerization initiator solution, the concentration of azobisisobutyronitrile is 0.01M, LiPF 6 The mass percentage is 5%, stand-by.

[0113] The fourth step, according to the required composite solid electrolyte formula, the polymer monomer 2-cyanoacrylate ethyl ester solution obtained in the first ...

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Abstract

The invention discloses an in-situ preparation method of a double-polymer composite solid electrolyte. The in-situ preparation method of the double-polymer composite solid electrolyte comprises the steps of: the step 1, dissolving 2-cyano-ethyl acrylate in a small molecular solvent to prepare a first polymer monomer solution; the step 2, dissolving 1, 3-dioxolane in a small molecular solvent to prepare a second polymer monomer solution; the step 3, dissolving a polymerization initiator and lithium salt in a small molecular solvent to prepare a polymerization initiation solution; the step 4, mixing the two polymer monomer solutions to obtain a first mixed solution; the step 5, mixing the polymerization initiation solution with the first mixed solution to obtain a solid electrolyte solution;and the step 6, drying the solid electrolyte solution to obtain a composite solid electrolyte. The invention also discloses a double-polymer composite solid electrolyte, a solid electrolyte membraneand a preparation method thereof. The room-temperature conductivity of the solid electrolyte can be improved, an electrochemical window is widen, the mechanical strength is improved and the problem ofpoor interface contact of the solid electrolyte is avoided.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a double polymer composite solid electrolyte, an electrolyte membrane and an in-situ preparation method thereof. Background technique [0002] At present, lithium-ion batteries have the advantages of high voltage, high specific energy, many cycle times, and long storage time. They are widely used in consumer electronics, new energy vehicles, and energy storage. The electrical performance, service life and The study of safety performance is extremely important. [0003] For solid-state lithium-ion batteries, their high energy density and high safety have attracted much attention. Solid-state batteries use the chemical inertness and high-strength mechanical characteristics of solid-state electrolytes to inhibit the occurrence of side reactions inside the battery and the formation of lithium dendrites, thereby optimizing and improving the safety of lithium batteries, ...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0565H01M10/0525
CPCH01M10/0562H01M10/0565H01M10/0525H01M2300/0068H01M2300/0082H01M2300/0091Y02E60/10
Inventor 孟繁慧刘婧郑涛高凡周江伍绍中
Owner TIANJIN LISHEN BATTERY