Wide-temperature self-healing electrolyte, preparation method thereof and lithium battery

A technology of electrolyte and lithium battery, which is applied in the field of wide-temperature self-healing electrolyte and its preparation, and can solve problems such as service capability decline, device short circuit, and capacity reduction.

Pending Publication Date: 2021-09-03
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inorganic solid electrolyte can maintain chemical stability in a wide temperature range, and has better mechanical strength and higher ionic conductivity at room temperature. challenge
For polymer electrolyte materials, slight damage mainly affects the interface contact between the electrolyte and the pole piece, resulting in a sharp increase in inter

Method used

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  • Wide-temperature self-healing electrolyte, preparation method thereof and lithium battery
  • Wide-temperature self-healing electrolyte, preparation method thereof and lithium battery
  • Wide-temperature self-healing electrolyte, preparation method thereof and lithium battery

Examples

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preparation example Construction

[0040] The present invention also provides a method for preparing the wide temperature self-healing electrolyte described in the above technical solution, comprising the following steps:

[0041] S1. N-ethylethanolamine and carbon disulfide are reacted, and the product obtained is recorded as TDS;

[0042] In step S1, the reaction solution is iodine-containing chloroform, and the reaction condition is ice bath. The molar ratio of N-ethylethanolamine and carbon disulfide is 1:(0.5-1).

[0043] S2. reacting diisocyanate with hydroxyl-terminated polyether polyol to obtain isocyanate-terminated polyether polyol;

[0044] In step S2, the diisocyanate is toluene diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), hexamethylene One or more in radical diisocyanate (HDI), lysine diisocyanate, preferably toluene diisocyanate; Described polyether polyol is one or more in polyethylene glycol, polypropylene glycol...

Embodiment 1

[0051] A wide temperature self-healing electrolyte, the preparation method comprising:

[0052] S1. Add 17.8g of N-ethylethanolamine and 100ml of chloroform into the flask and mix and stir in an ice bath, then add 6ml of carbon disulfide and 12.7g of iodine to react for 3 hours, then remove impurities, and record the product as TDS.

[0053] S2. Reaction of 2,4-toluene diisocyanate and hydroxyl-terminated polypropylene glycol in chloroform at 80°C to obtain 2,4-toluene diisocyanate-terminated polypropylene glycol (molecular weight is about 2300Da)

[0054] S3. Dissolve 2 mmol of glycerol in 50 mL of chloroform CHCl 3 and pour it into a 100ml three-necked flask, then add 0.1mmol of dibutyltin dilaurate (DBTDL) into the flask, then add 6mmol of 2,4-toluene diisocyanate-terminated polypropylene glycol and 1mmol of TDS, and react at 60°C for 5h ; Pour into a polytetrafluoroethylene mold to volatilize to form a film, and obtain a wide temperature self-healing electrolyte membrane....

Embodiment 2-3 and comparative example 1

[0059] A wide temperature self-healing electrolyte, compared with Example 1, the difference is that the molar ratio of glycerol, TDS and 2,4-toluene diisocyanate-terminated polypropylene glycol is shown in Table 1, and the others are roughly the same as Example 1, I won't repeat them here.

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Abstract

The invention provides a wide-temperature self-healing electrolyte, a preparation method thereof and a lithium battery. The wide-temperature self-healing electrolyte is of a three-dimensional cross-linked network structure composed of a glycerin chain segment, an isocyanate-terminated polyether polyol chain segment and a chain segment at least containing two terminal hydroxyl groups and a disulfide bond. A large number of repeated disulfide bond groups and self-complementary hydrogen bond structures are introduced into electrolyte substrate material molecules containing self-complementary hydrogen bond structures, so that a three-dimensional cross-linked network structure is formed, and cross-scale (molecular scale, micron scale and macro scale) damage perception response of the electrolyte and rapid self-healing of the material are realized by utilizing an intermolecular exchange reaction of disulfide bonds, so that a multi-layer (molecule-component-device-system) self-healing repair function is further achieved. The wide-temperature self-healing electrolyte has high elastic modulus and excellent electrochemical performance, and can be used as a solid electrolyte of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of electrolyte materials, in particular to a wide-temperature self-healing electrolyte, a preparation method thereof, and a lithium battery. Background technique [0002] Electrolyte is one of the key materials of lithium-ion batteries, which is placed between the positive and negative electrodes of the battery to transfer charges. Although lithium-ion batteries have been widely used in people's daily life, most of the electrolytes used are traditional flammable organic liquids, which pose a huge safety hazard during repeated charging and discharging. In order to improve the safety performance of lithium-ion batteries, replacing liquid electrolytes with more reliable all-solid electrolytes has become an important choice to solve this problem. Solid electrolytes without organic solvents can greatly improve the safety performance of lithium batteries, and have been widely concerned by researchers. Wide-tempe...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0565H01M10/4235H01M2300/0085H01M2300/0082H01M50/403H01M50/414H01M50/44H01M50/494Y02E60/10H01M2300/0025
Inventor 曹元成刘洪浩汤舜蒋世用成信刚
Owner HUAZHONG UNIV OF SCI & TECH
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