A kind of polymer electrolyte and lithium ion battery containing the polymer electrolyte

Abstract

The invention belongs to the technical field of lithium ion batteries, in particular to a polymer electrolyte and a lithium ion battery containing the polymer electrolyte. The preparation method of the polymer electrolyte comprises: (1) in parts by weight, dissolving 5-90 parts of an organic solvent and 0.01-27 parts of a functional polymer to prepare a uniformly mixed A system; (2) mixing the A system, lithium salt, The functional additive and the functional reactant are uniformly mixed to obtain a mixed solution; (3) performing in-situ polymerization on the mixed solution to obtain a polymer electrolyte. The polymer electrolyte prepared by the invention can effectively improve the safety of the lithium ion battery and has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a polymer electrolyte and a lithium ion battery containing the polymer electrolyte. Background technique [0002] Lithium-ion batteries have been widely used in digital products, power and energy storage and other fields. At present, commercial lithium-ion batteries mainly use liquid electrolytes, which are prone to thermal runaway during use, resulting in safety problems. Solid-state lithium-ion batteries use solid electrolytes instead of liquid electrolytes, which can fundamentally solve the safety problem of lithium-ion batteries. At present, the solid-state electrolytes of solid-state lithium-ion batteries mainly include polymer electrolytes, sulfide electrolytes, oxide electrolytes, and hydride electrolytes. At present, polymer electrolytes mainly have disadvantages such as low room temperature conductivity and poor oxidation resistance. Sulfide electrolytes a...

AI Technical Summary

Problems solved by technology

However, there are problems such as poor uniformity and processing difficulties in semi-solid electrolytes.

[0003] In order to improve the safety performance of lithium-ion batteries, the Chinese invention patent application with application number 201810272566.8 discloses a method for preparing in-situ solid-state batteries, using electrolyte salts, organic solvents, acrylates and initiators as raw materials to prepare solid-state batteries in situ Battery, the patent can improve the interface contact between the electrolyte and the positive and negative electrodes, but the introduction of the initiator will produce side reactions during the charging and discharging process of the battery

The Chinese invention patent application with the application number 201810562363.2 discloses a method for preparing an all-solid-state battery. The patent uses inorganic lithium salts and carbonate oligomers to prepare an electrolyte, which is injected into the middle of the positive and negative electrodes and processed to form an all-solid-state battery. , but the patent has problems such as long production process in the process of forming the electrolyte into a solid electrolyte

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