Polymer electrolyte capable of working in wide temperature range and preparation method thereof

A polymer and electrolyte technology, applied in electrolyte battery manufacturing, non-aqueous electrolyte battery, sustainable manufacturing/processing, etc., can solve the problem of film-forming properties, strength affecting ionic liquids, unable to maintain size, shape and mechanical properties, difficult to suppress branching Crystal nucleation/growth and other issues to achieve the effect of broadening the operating temperature range, improving safety and cycle stability, and reducing the occurrence of side reactions
CN112358624AActive Publication Date: 2021-02-12INST OF CHEM CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF CHEM CHINESE ACAD OF SCI
Publication Date
2021-02-12

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Abstract

The invention discloses a polymer electrolyte capable of working in a wide temperature range, a preparation method of the polymer electrolyte and application of the polymer electrolyte in a solid-state lithium (sodium) secondary battery. The polymer electrolyte is prepared from a precursor solution containing a polymeric monomer, an initiator and an electrolyte salt on the surface of a base material in an in-situ polymerization manner, and is of a hyperbranched structure without a main chain and with multiple branched chains. The polymer electrolyte has the advantages of high ionic conductivity and transference number, wide electrochemical window, good mechanical strength and the like, and can stably work in a temperature range of -40-110 DEG C. Meanwhile, the preparation method of the polymer electrolyte is simple, mild in condition, low in preparation cost, easily available in raw materials and suitable for large-scale production. The polymer electrolyte disclosed by the invention isused for constructing a solid-state lithium (sodium) secondary battery, so that the working temperature of the battery can be effectively expanded, and the safety of the battery under extreme workingconditions is improved.
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Description

technical field

[0001] The invention belongs to the field of chemical power sources and also belongs to the technical field of energy materials, and specifically relates to a novel polymer electrolyte capable of working in a wide temperature range and a preparation method thereof. Background technique

[0002] Compared with the organic liquid electrolytes commonly used commercially at present, the polymer electrolyte has the characteristics of no leakage, good safety performance, good electrochemical stability, and good mechanical properties, and it can also be prepared into any shape and size , making lithium-ion batteries develop in the direction of miniaturization and thinning. The original polymer electrolyte was the linear polymer PEO, a polymer consisting of one main chain -(CH2CH2O)n-. However, such a regular linear structure will make the molecular chains easy to entangle, and face the problems of crystallization at room temperature and low ionic conductivity. Ther...

Claims

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