Coaxial wet-spinning fiber-shaped Zn-ion batteries enabled by Zn powder and cellulose nanofiber reinforced gel electrolyte

An integrated core-sheath Zn-ion battery with cellulose nanofiber-reinforced gel electrolyte and Zn powder anode is fabricated via coaxial wet-spinning. This unique design enables ultra-stable and dendrite-free cycling for over 1600 h.