Curling-resistant high-permeability isolation film

Abstract

The invention discloses a curling-resistant high-permeability isolation film, which comprises an isolation base film and a ceramic coating, wherein the lower surface of the isolation base film is coated with a PTC material layer; reinforcing base blocks are integrally formed on the lower surface of the PTC material layer at equal intervals; the ceramic coating is pasted on the lower surface of thePTC material layer. In order to avoid the gap generation due to twisting folding of the isolation film, the reinforcing base blocks are arranged on the lower surface of the PTC material layer; the reinforcing base blocks are fixedly clamped in a fixing groove formed in the upper surface of the ceramic coating so as to achieve the stable state; the reinforcing base blocks are made of the same material as the ceramic coating; the resistance can be favorably reinforced; the curling-resistant effect can be improved; the hole diameter of the nanometer hole passage is enabled to be in a range of 0.1 to 1 mu m; the potential safety hazards caused by the influence on the stability of the integral structure of the isolation film due to too big hole diameter can be avoided; meanwhile, the defects that the hole diameter is too small, the lithium ion passing is influenced, and the transmission speed can be further decelerated are avoided.

Description

technical field [0001] The invention relates to the technical field of isolation membranes, in particular to an anti-curl and high-permeability isolation membrane. Background technique [0002] The free electrolyte in the lithium battery inevitably undergoes oxidation-reduction side reactions with the positive and negative electrodes during the charge-discharge cycle. In addition to consuming a large amount of electrolyte, it will also cause the battery to be poor, which will further increase the polarization of the battery. It affects the performance of the electrochemical performance of the battery, and it is easy to cause the lithium battery to turn into metal lithium and produce lithium deposition, which has great potential safety hazards. In the prior art, a special separator for lithium batteries is generally used, but this Separators are easy to fold and cause gaps, so we propose an anti-curl and high-permeability separator to solve the above problems. Contents of t...

AI Technical Summary

Problems solved by technology

[0002] The free electrolyte in the lithium battery inevitably undergoes oxidation-reduction side reactions with the positive and negative electrodes during the charge-discharge cycle. In addition to consuming a large amount of electrolyte, it will also cause the battery to be poor, which will further increase the polarization of the battery. It affects the performance of the electrochemical performance of the battery, and it is easy to cause the lithium battery to turn into metal lithium and produce lithium deposition, which has great potential safety hazards. In the prior art, a special separator for lithium batteries is generally used, but this The isolation film is easy to fold and cause gaps easily, so we propose an anti-curling high-permeability isolation film to solve the above problems

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