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Gel electrolyte and preparation method and application thereof

A gel electrolyte and electrolyte salt technology, applied in the polymer field, can solve the problems of complex preparation process and poor repeatability, and achieve the effects of simple operation, low production cost, good wettability and rheology

Pending Publication Date: 2022-08-09
XUZHOU LANOXENE INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on this, the present invention provides a gel electrolyte and its preparation method and application to solve the technical problems of complex preparation process and poor repeatability in the preparation of gel electrolyte by in-situ cross-linking polymerization method in the prior art

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  • Gel electrolyte and preparation method and application thereof
  • Gel electrolyte and preparation method and application thereof
  • Gel electrolyte and preparation method and application thereof

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preparation example Construction

[0026] The preparation method of the gel electrolyte provided by the invention belongs to a method for preparing the gel electrolyte by controlling the polymer polymerization time by regulating the content of the initiator. The preparation method is simple and efficient, and specifically comprises the following steps: Lithium trifluoromethanesulfonimide is dissolved in an appropriate amount of mixed solvent (1,3 dioxolane and ethylene glycol dimethyl ether) as an electrolyte salt. By adding a certain amount of initiator, 1,3 can be induced. The dioxolane ring was opened, and then gradually coagulated under the action of ethylene glycol dimethyl ether, and finally a gel electrolyte was obtained.

[0027] In the technical solution of the present invention, 1,3-dioxolane and ethylene glycol dimethyl ether are both commonly used chemical materials on the market, so that this method has the advantages of widely available raw material sources and low cost, and is suitable for commerc...

Embodiment 1

[0030] Dissolve 2mol lithium bis-trifluoromethanesulfonimide (referred to as LiTFSI) in a mixed solvent of 1 ml of 1,3-dioxolane (referred to as DOL) and 1 ml of ethylene glycol dimethyl ether (referred to as DME), A liquid electrolyte was obtained; subsequently, in the liquid electrolyte, 5 mg of BI was added 3 As an initiator, a polymerization reaction is initiated, and a viscous electrolyte precursor is formed after mixing uniformly, and the homogeneous gel electrolyte is obtained by standing for 4 hours.

[0031] figure 1 It is a real photo during the preparation process of the gel electrolyte in Example 1. Add boron triiodide (BI 3 ) initiator to obtain a viscous electrolyte precursor ( figure 1 In a and b), DOL gradually opened and polymerized, and after standing for 4 hours, a homogeneous gel electrolyte ( figure 1 in c).

[0032] Electrochemical performance test: Pipette 30uL of the viscous electrolyte precursor prepared in Example 1 to directly assemble the Li-S ...

Embodiment 2

[0036] Dissolve 2mol lithium bistrifluoromethanesulfonimide (referred to as LiTFSI) in a mixed solvent of 2ml of 1,3-dioxolane (referred to as DOL) and 2ml of ethylene glycol dimethyl ether (referred to as DME), A liquid electrolyte was obtained; subsequently, in the liquid electrolyte, 400 mg of lithium tetrafluoroboride (LiBF for short) was added 4 ) as an initiator, after stirring and mixing evenly, a viscous electrolyte precursor is formed, and it is allowed to stand for 5 hours to obtain a homogeneous gel electrolyte.

[0037] Figure 4 It is a real photo during the preparation process of the gel electrolyte in Example 2. Lithium tetrafluoroborate (LiBF 4 ) initiator to obtain a viscous liquid electrolyte ( Figure 4 In a and b), DOL is gradually ring-opened and polymerized, and after standing for 5 hours, a homogeneous gel electrolyte ( Figure 4 in c).

[0038] Electrochemical performance test: Pipette 30uL of freshly prepared viscous electrolyte to directly assemb...

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Abstract

The invention relates to a gel electrolyte and a preparation method and application thereof, and the preparation method of the gel electrolyte comprises the following steps: dissolving lithium bis (trifluoromethylsulfonyl) imide as an electrolyte salt in a mixed solvent prepared by mixing 1, 3-dioxolane and ethylene glycol dimethyl ether, adding an initiator, and uniformly mixing to obtain a viscous electrolyte precursor; the initiator is used for inducing 1, 3-dioxolane to carry out a ring-opening reaction, and the ethylene glycol dimethyl ether is used for realizing the polymerization reaction after the ring-opening reaction. According to the gel electrolyte as well as the preparation method and the application thereof, the initiator is creatively used for carrying out ring opening on 1, 3-dioxolane at first, and then polymerization is carried out under the action of ethylene glycol dimethyl ether, so that the polymerization speed is delayed, the polymerization time is prolonged, and the intermiscibility of the gel electrolyte and an electrode interface is ensured in the application of the gel electrolyte; the reaction conditions are mild, the operation is simple, and the production cost is low.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a gel electrolyte and a preparation method and application thereof. Background technique [0002] In recent years, with the rapid development of mobile electronic devices, electric vehicles and smart grids, the demand for high energy density battery systems has been increasing. Lithium-sulfur batteries are considered to be a promising battery system. However, because the intermediate polysulfides formed during the charging and discharging process are easily soluble in the liquid electrolyte, lithium-sulfur batteries face problems such as low utilization rate of active materials, poor cycle stability, and low Coulombic efficiency. In this case, the lithium dendrite phenomenon is serious, and it is easy to pierce the separator, resulting in battery short circuit and safety problems, which seriously restrict its large-scale commercial application. [0003] The use of solid electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/0565H01M10/052H01M2300/0082Y02P70/50
Inventor 曲婕苏忠赖超梁嘉杰
Owner XUZHOU LANOXENE INST CO LTD
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