| abstract |
Provided is a non-aqueous electrode or separator binder for use in a lithium ion battery excellent in cycle life characteristics at high temperature. It is a non-aqueous binder in an electrode or separator for a lithium ion battery in which cellulose nanofibers and a thermoplastic fluorine resin are composited, wherein the cellulose nanofibers have a fiber diameter (diameter) of 0.002 μm or more and 1 μm or less, It is characterized in that it has a fiber length of 0.5 μm to 10 mm and an aspect ratio (fiber length of cellulose nanofiber / fiber diameter of cellulose nanofiber) of 2 or more and 100,000 or less. |