Preparation method of gel polymer electrolyte

A gel polymer and electrolyte technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, electrolyte immobilization/gelation, etc. It can solve problems such as electrolyte leakage, low room temperature ionic conductivity, and unsatisfactory practical applications. , to achieve the effect of easy realization, high room temperature ionic conductivity, and simple realization

Active Publication Date: 2020-09-11
武汉瑞科美新能源有限责任公司
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Problems solved by technology

[0003] Gel and solid polymer electrolyte lithium-ion batteries can effectively solve the problem of electrolyte leakage during the use of liquid lithium-ion batteries, greatly reducing the burning and explosion of lithium-ion batteries under extreme conditions such as overcharge and discharge, puncture and impact. The possibility of safety issues, but compared with traditional liquid electrolytes, most of the all-solid electrolytes have low room temperature ionic conductivity, about 10 -7 S cm -1 , and has a high dependence on temperature, all-solid-state batteries generally need to work normally at a relatively high temperature (60-80°C), which is far from meeting the needs of practical applications

Method used

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[0024] A preparation method of a gel polymer electrolyte, comprising the steps of:

[0025] S100, mixing a polymerizable solvent monomer with at least one electrolyte solvent and electrolyte lithium salt to obtain an electrolyte composition;

[0026] S200, will contain Li + 、Al 3+ , Ga 3+ 、In 3+ The cation and PF 6- , BF 4- , Cl - 、Br - , I - 、CF 3 SO 3- Anionic combination or BF 3 The initiator of the compound is added to the electrolyte composition to polymerize to form a gel polymer electrolyte.

[0027] As a further optimization of this embodiment, the polymerizable solvent monomer is selected from a monomer containing the following polymerizable functional groups: epoxy group, cyclocarbonate group, unsaturated double bond and other groups.

[0028] The polymerizable solvent monomer is preferably an epoxy ether-containing monomer.

[0029] The polymerizable solvent monomer is further preferably 1,3-dioxolane (DOL) and tetrahydrofuran (THF).

[0030] Wherein t...

Embodiment 1

[0039] An embodiment of the present invention provides a method for preparing a gel polymer electrolyte, the method comprising:

[0040] In a glove box filled with argon atmosphere, 8 mmol of lithium trifluoromethanesulfonimide (LiTFSI) was dissolved in 4 mL of 1,3-dioxolane (DOL) to prepare electrolyte A;

[0041] 4mmol lithium hexafluorophosphate (LiPF 6 ) was dissolved in 4mL of ethylene carbonate (EC): dimethyl carbonate (DMC) = 1:1 (V:V) mixed solvent to prepare electrolyte B, and then electrolyte A and electrolyte B is mixed according to 0.25:0.75 (V:V) to make an electrolyte composition;

[0042] 4mmol of Al(OTf) that can initiate the polymerization reaction 3 Add it into 4mL of electrolyte composition, stir well to make it dissolve evenly, and then start the polymerization reaction. 3 The initiator concentration is 1 mmol / L.

Embodiment 2

[0044]Prepare the gel polymer electrolyte by the same method as in Example 1, except that aluminum trifluoromethanesulfonate (Al(OTf) 3 ) was replaced by boron trifluoride etherate complex (BF 3 ·Et 2 O).

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Abstract

The invention relates to a preparation method of a gel polymer electrolyte. The method comprises the following steps: mixing an electrolyte solvent, a polymerizable solvent monomer and an electrolytelithium salt to obtain an electrolyte composition; and adding cationic ions containing Li<+>, Al<3+>, Ga<3+> and In<3+> and anionic combinations of PF6<->, BF4<->, Cl<->, Br<->, I<-> and CF3SO3<-> orinitiators of BF3 compounds into the electrolyte composition, and polymerizing to generate the gel polymer electrolyte. The preparation method has the following beneficial effects: the epoxy ether monomer is self-polymerized, and the electrolyte is wrapped in the epoxy ether polymer to obtain the gel polymer electrolyte, so that the obtained gel polymer electrolyte has certain viscosity and relatively high room-temperature ionic conductivity.

Description

technical field [0001] The invention relates to the technical field of new electrolyte materials for secondary batteries, in particular to a preparation method of a gel polymer electrolyte. Background technique [0002] With the technological development and demand for electric vehicles and rechargeable mobile devices, secondary batteries, as a representative of the new energy field, have also developed rapidly. Among these secondary batteries, lithium-ion batteries are light in weight and energy-efficient. Advantages such as high density have been commercially produced and widely used. Generally, a lithium secondary battery includes an anode and cathode active material that can intercalate and deintercalate lithium ions and an electrolyte as a lithium ion transport medium. Among them, the electrolyte is one of the important components of the high specific energy lithium secondary battery, which has a critical impact on the energy density, reaction kinetics, cycle life and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCH01M10/0565H01M10/0525H01M10/058H01M2220/20H01M2300/0085Y02P70/50
Inventor 不公告发明人
Owner 武汉瑞科美新能源有限责任公司
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