| abstract |
To provide a binder for a non-aqueous electrode or separator used in a lithium ion battery having excellent cycle life characteristics at high temperatures. As a non-aqueous binder in an electrode or separator for lithium ion batteries in which cellulose nanofibers and a thermoplastic fluorine-based resin are complexed, the cellulose nanofibers have a fiber diameter (diameter) of 0.002 μm or more and 1 μm or less, and a fiber length of 0.5 μm or more 10 mm Hereinafter, it is characterized in that the aspect ratio (fiber length of cellulose nanofiber/fiber diameter of cellulose nanofiber) is 2 or more and 100000 or less of cellulose. |