Composite film material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of battery materials, and particularly relates to a composite film material and a preparation method and application thereof. The chelating agent is loaded on the thin film material, when the thin film material is used as the diaphragm, the wettability of the diaphragm to electrolyte can be further improved, meanwhile, the chelating effect on heavy metal ions can be achieved, the capacity of capturing heavy metal is given to the diaphragm, the heavy metal is inactivated in an energy storage device, the catalytic reaction is prevented, and the service life of the diaphragm is prolonged. The influence on the active components in the electrode and the electrolyte is avoided, so that the capacity attenuation is reduced, and the service life is prolonged. Meanwhile, the dialdehyde nanocellulose is adopted as a carrier of the chelating agent, so that the characteristics of large specific surface area and multiple exposed groups are achieved, more chelating agent components can be loaded, and the heavy metal capturing capacity of the diaphragm is enhanced.

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