Hydrophilic diaphragm and battery containing hydrophilic diaphragm

Abstract

The invention discloses a hydrophilic diaphragm and a battery containing the hydrophilic diaphragm. The hydrophilic diaphragm is a microporous membrane containing a hydrophilic high polymer material; and the aperture of the hydrophilic diaphragm is 0.1-5 microns, the thickness of the hydrophilic diaphragm is 20-500 microns, and the porosity of the hydrophilic diaphragm is 30-90%. The hydrophilic diaphragm has the beneficial effects that the wettability of the hydrophilic diaphragm in a water-based electrolyte is obviously superior to that of commercial PP and PE microporous membranes and hydrophilic treated polyolefin diaphragms, the capacity of absorbing the water-based electrolyte is higher, and the conductivity of the diaphragm is higher; the hydrophilic diaphragm disclosed by the invention has a uniform microporous structure, the barrier capacity of the hydrophilic diaphragm is higher than that of non-woven fabric, fiber paper and a glass fiber membrane, and the risk of internal short circuit of the battery can be reduced; the hydrophilic diaphragm and electrolyte act together to induce regular growth of zinc dendrites, so that the cycle life of a metal zinc electrode is prolonged; and polarization overpotential of Zn dissolution/deposition is optimized, and the electrochemical performance of the zinc electrode is improved.

Description

Technical field[0001]The present invention belongs to the technical field of the battery, and more particularly to a hydrophilic diaphragm and a battery containing the hydrophilic diaphragm.Background technique[0002]Energy and environmental issues have become a key issue related to sustainable development around the world, developing new green renewable energy and feeding and discharging energy storage devices have become an urgent task of humans. In recent years, the lithium-ion battery has the advantages of high energy density, long cycle life, no memory effect, widely used in portable electronic products, vehicle power batteries, large-scale energy storage, communication base stations and other fields. However, the high cost of lithium-ion batteries, limited lithium reservations, poor security, environmental pollution problems make it limited by specific application scenarios. In another market, the mainstream lead-acid battery has only 25-45 wH / kg, which uses the concentrated ...

AI Technical Summary

Problems solved by technology

[0009] The main purpose of the present application is to provide a hydrophilic diaphragm with a microporous structure and strong hydrophilicity, which solves the problem that the electrode particles pass through the diaphragm during the battery cycle and causes a short circuit in the battery; at the same time, the hydrophilic diaphragm is provided. Application of non-reactive separator in battery method

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