Organosiloxane room temperature ionic liquid electrolyte material and its application in electrochemical power storage device

Abstract

The invention provides an organosiloxane room temperature ionic liquid electrolyte material and its application in an electrochemical power storage device. The material is room temperature ionic liquid whose cationic chemical structural formula contains organosiloxane, and the cationic chemical structural formula is as represented by formula I in the specification. In the formula I, R1, R2 and R3 are selected from same or different C1-C10 alkyl groups; M is an ether chain having a structure like (CH2)nO[(CH2)mO]x(CH2)y, wherein, n and m are integers of 0 to 10, and x and y are integers of 0 to 10; R4, R5 and R6 are selected from same or different C1-C10 alkyl groups or alkyloxy groups or -O-SiR7R8R9, wherein, R7, R8 and R9 are C1-C10 alkyl groups or hydrogen, and at least one of R7, R8 and R9 is an alkyl group. The organosiloxane room temperature ionic liquid provided in the invention can be applied in lithium ion batteries as an electrolyte material or an additive; oxygen atoms of the ether chain in the cationic chemical structural formula of the ionic liquid and lithium ions Li<+> can undergo complexation, which promotes dissociation degree of lithium salt in the ionic liquid; furthermore, a cationic skeleton both contains hydrophobic organosilicon groups and hydrophilic ether (polyether) chain segments, which is favorable for improving interfacial properties of batteries.

Description

technical field [0001] The invention relates to the field of chemical technology, in particular to a class of organosilicon ether room temperature ionic liquid electrolyte material and its application in electrochemical energy storage devices. technical background [0002] At present, the organic electrolyte materials used in the lithium battery industry are mainly alkyl carbonate compounds and LiPF6 lithium salt systems. temperature range (approximately -30 to 80°C); moreover, alkyl carbonate-based organic electrolyte materials are highly flammable, so there are huge hidden dangers in safety; especially in the field of hybrid and all-electric vehicle applications, safety Sexuality is an important factor restricting the practical application of these materials. For supercapacitors, since the stored energy is proportional to the square of the charging voltage of the electrolyte (E=1 / 2CV 2 ), thus increasing the electrochemical window of the electrolyte will greatly increase...

AI Technical Summary

Problems solved by technology

[0005] However, people have not yet had a clear understanding of the relationship between the chemical structure of ionic liquids and the physical and chemical properties of materials and electrochemical properties, especially as electrolyte materials for supercapacitors and lithium-ion batteries, trying to make ionic liquids have high ionic conductivity at the same time The difficulties of high efficiency and high electrochemical stability have not been solved, and the compatibility of ionic liquid electrolytes and electrode materials needs to be improved.

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