A kind of single ion polymer electrolyte and preparation method thereof, single ion polymer electrolyte membrane, lithium ion battery

Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to a single-ion polymer electrolyte, a preparation method thereof, a single-ion polymer electrolyte membrane and a lithium ion battery. The single-ion polymer electrolyte comprises polymer chains formed by structure units represented by formula 1 (shown in the description), wherein membrane supporting groups are linked between the two polymer chains, and two ends of the membrane supporting groups are respectively connected to sites 1 or 2 of the structure units; lithium ion providing groups are connected to the sites 1 or 2 of the structure units; the lithium ion providing groups and the membrane supporting groups are respectively connected to the site 1 or 2 of each independent structure unit; and the molar ratio of the lithium ion providing groups to the membrane supporting groups is 1 to (1-2). The single-ion polymer electrolyte has the advantages of high room temperature conductivity, mechanical strength and flame retardance and the like and further has very considerable application prospects in the field of the lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a single-ion polymer electrolyte and a preparation method thereof, a single-ion polymer electrolyte membrane, and a lithium-ion battery. Background technique [0002] Compared with liquid electrolytes, solid polymer electrolytes not only have lighter weight and good machinability, but also can overcome the shortcomings of liquid electrolytes such as easy leakage, difficult processing and sealing, and short life. An important electrolyte material for the technical performance bottleneck of lithium-ion batteries. [0003] Li-ion migration number is an indispensable parameter in the research of lithium-ion batteries. The lithium ion migration number of many systems is very small, approximately between 0.1 and 0.4. However, during the charge and discharge process, the anions do not participate in the reaction of the electrode, and will gather at the electr...

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Problems solved by technology

However, the composite electrolyte will cause macroscopic phase separation and other problems during the long-term cycle of the battery.

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