Product characteristics

(1) It has electrical insulation to ensure effective mechanical isolation of positive and negative electrodes;

(2) It has certain pore size and porosity to ensure low resistance and high ionic conductivity, uniform pore size and distribution, good current density uniformity, permeability and lithium ion permeability;

(3) Because the solvent of the electrolyte is organic compound with strong polarity, the diaphragm must be resistant to electrolyte corrosion, have sufficient chemical and electrochemical stability, do not react with the electrolyte, and cannot affect the chemical properties of the electrolyte;

(4) It has good wettability to the electrolyte and has enough moisture absorption capacity;

(5) It has enough mechanical properties, including puncture strength, tensile strength, etc., but the thickness is as small as possible;

(6) Space stability and smoothness are good;

(7) Thermal stability and automatic shut-off protection performance are good, and the power battery has higher requirements for diaphragm, and composite membrane is usually used.

(8) The heat shrinks of the diaphragm should be small, otherwise it will cause short circuit, and then lead to thermal runaway of the battery.

(9) The diaphragm should have melting integrity after closing to avoid short circuit caused by electrode contact.

Technological

The diaphragm production process includes raw material formula and rapid formula adjustment, microporous preparation technology, complete set of equipment independent design, etc.

Micropore preparation technology is the core of lithium-ion battery separator preparation process, which includes dry unidirectional stretching, dry biaxial stretching and wet process.