Modification method of alginate dressing taken as lithium battery diaphragm

Abstract

The invention discloses a modification method of an alginate dressing taken as a lithium battery diaphragm, and belongs to the technical field of alginate dressing modification. The modification method comprises the following steps: slicing a medical alginate dressing to obtain slices with a thickness of 1.5 to 2.0 mm; then soaking the medical alginate dressing in a chemical processing liquid, sealing, carrying out reactions for 10 to 72 hours at a room temperature, absorbing the solvent in the alginate dressing by liquid absorbing paper, drying alginate dressing at a temperature of 80 DEG C for 6 to 12 hours, and then drying alginate dressing in vacuum at a temperature of 100 DEG C for 10 to 48 hours to obtain a alginate dressing film, which has a thickness of 0.5-2.0 mm and porosity of 60-80% and is used as a lithium battery diaphragm. A technology with a low cost is used to modify a lithium ion battery diaphragm, the structure of the lithium ion battery diaphragm becomes more compact, the lithium ions can go through the battery diaphragm more easily, impurities such as Ca2+ are removed; the side reactions, which may influence the performance of lithium ion batteries, are effectively prevented; and the properties of prepared lithium ion battery diaphragm are excellent, in particular, lithium ion transmission performance.

Description

technical field [0001] The invention belongs to the technical field of modifying an alginate dressing used as a lithium battery diaphragm, and in particular relates to a modification method for an alginate dressing used as a lithium battery diaphragm. Background technique [0002] Due to the characteristics of high energy density, high cell voltage, good rate performance, small self-discharge and environmental protection, lithium-ion batteries are widely used in digital products, electric vehicles and electric vehicles. The most commonly used diaphragm material for lithium-ion batteries is polyolefin material, but because polyolefin material itself is non-polar, it has poor wettability to water and electrolyte, which seriously affects its liquid absorption rate to electrolyte Electrochemical properties such as , liquid retention rate and ionic conductivity also affect the further modification of the separator surface. Therefore, this patent proposes an innovative material—m...

AI Technical Summary

Problems solved by technology

However, because it is natural cellulose, it contains a large amount of impurity ions, and the material is too fluffy, which affects the ionic conductivity and the assembly of the battery; more importantly, due to the high content of impurities and many uncontrollable factors, it affects the electrode reaction of lithium-ion batteries, such as of which Ca 2+ Side reactions will occur during battery operation, which will affect the charge and discharge performance of the battery.

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