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release time:2023-02-09
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1. Lithium battery diaphragm function Lithium -ion battery, consisting of the main part of the positive electrode material, negative electrode material, diaphragm, and electrolyte. Among them, the diaphragm is a thin film with a microporous structure. It is the most technical barrier component in the lithium ion battery industry chain.
A. The positive and negative electrodes of lithium batteries are separated to prevent positive and negative contacts from forming short circuit;
B. The micropores in the film can allow the lithium ion to pass to form a charging and discharge circuit.
2. Basic materials for lithium battery diaphragm manufacturing materials: polyethylene (PE) diaphragm, polypropylene (PP) diaphragm, polyethylene (PZ) and acrylic (PP) composite; Single -layer PE film, double layer PP/PE film, multi -layer film
3. The requirements for lithium -ion batteries include:
(1) A mechanical isolation of electronic insulation to ensure positive and negative electrode;
(2) There are certain pores and pore rates, ensure low resistance and high ionic conductivity, and have a good transmission for lithium ions;
(3) Electrolytic liquid corrosion has sufficient chemical and electrochemical stability. This is because the electrolyte solvents are organic compounds with strong poles;
(4) Has the infiltration of good electrolytes, and strong moisturizing ability;
(5) High mechanical stability, including puncture intensity, stretching strength, etc., but as small as possible;
(6) Spatial stability and goodness;
(7) Good thermal stability and automatic offset protection performance;
(8) The heating contraction rate is small, otherwise it will cause short circuit and cause the battery thermal output. In addition, power batteries usually use composite membranes, which have higher requirements for diaphragm.
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