Nuclear pore film-based solid electrolyte film and preparation method thereof

Abstract

The invention discloses a nuclear pore film-based solid electrolyte film and a preparation method thereof. A polyimide heavy ion track etching porous film is used as a base film, polyimide can resisthigh temperature of 400 DEG C, can stably work within the temperature range of -200 to 300 DEG C, has extremely low contractibility, and has excellent mechanical properties and insulativity. Due to the excellent performance of the polyimide film, the high mechanical property and thermal stability of the prepared electrolyte diaphragm are ensured. The film (nuclear pore film) prepared by the heavyion track etching technology has the advantages of consistent pore diameter, controllable size and convenient and adjustable pore density. The polymer chain electrolyte is filled in the nanopores of the polyimide heavy ion track etching film, and the spatial confinement effect of the directionally arranged nanopores enables the polymer chain to extend along the direction of the nanopores, so thatthe glass transition temperature of the polymer is reduced, and the lithium ion conductivity of the polymer electrolyte is improved; therefore, the all-solid-state lithium ion battery or the lithium metal battery has excellent safety performance and battery performance.

Description

technical field [0001] The invention relates to a solid electrolyte diaphragm based on a nuclear pore membrane and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used due to the advantages of high energy density, high working voltage, long charge and discharge life, no memory effect, and little environmental pollution. There is a conflict between the high performance and safety of Li-ion batteries, leading to catastrophic battery accidents as the demand for high-energy-density Li-ion batteries continues to increase. All-solid-state lithium batteries have high theoretical capacity and good safety, and are considered to be an ideal choice for future energy storage devices. The preparation of a self-supporting thin electrolyte separator with high lithium-ion conductivity is the key to realizing high-performance lithium The key to secondary batteries is the core of all solid-state lithium-ion batteries and lithium metal batteries. ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that it is difficult to simultaneously combine lithium ion conductivity and mechanical strength in the existing improved PEO-based polymer solid-state electrolyte, the present invention provides a solid-state electrolyte diaphragm based on a nuclear pore membrane and a preparation method thereof

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