| abstract |
Provided is 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 thermoplastic fluorine resins are composited, 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 and 10 mm. Hereinafter, the aspect ratio (fiber length of cellulose nanofibers / fiber diameter of cellulose nanofibers) is characterized by being 2 or more and 100,000 or less cellulose. |