Secondary battery separator comprising cellulose coating layer and method for manufacturing the same
AssigneeUIF (University Industry Foundation), Yonsei University
InventorsSang-Young LEE, Young-Kuk HONG
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Abstract
Disclosed is a secondary battery separator including a cellulose coating layer containing cellulose nanofibers and cellulose nanocrystals on a porous support. The secondary battery separator has a light weight, excellent air permeability and excellent puncture strength, and thus can provide a lithium secondary battery with excellent physical properties, including ion conductivity, wettability with an electrolyte and heat stability.
Claims17
A secondary battery separator which comprises a cellulose coating layer containing cellulose nanofibers and cellulose nanocrystals on one surface or both surfaces of a porous support, wherein the cellulose coating layer comprises a continuous phase formed from a plurality of cellulose nanofibers having a chain entanglement structure and a dispersed phase formed from the cellulose nanocrystals.
A method for manufacturing a secondary battery separator, comprising a step of applying a cellulose coating composition containing cellulose nanofibers and cellulose nanocrystals onto one surface or both surfaces of a porous support to form a cellulose coating layer, wherein the solvent is a mixed solvent of water with an organic solvent having a higher boiling point than the boiling point of water, and the cellulose coating layer comprises a continuous phase formed from a plurality of cellulose nanofibers having a chain entanglement structure and a dispersed phase formed from the cellulose nanocrystals.
Dependencies are inferred from the claim text.