Elastic and Wearable Wire-Shaped Lithium-Ion Battery with High Electrochemical Performance

A stretchable wire-shaped lithium-ion battery is produced from two aligned multi-walled carbon nanotube/lithium oxide composite yarns as the anode and cathode without extra current collectors and binders. The two composite yarns can be well paired to obtain a safe battery with superior electrochemical properties, such as energy densities of 27 Whkg(-1) or 17.7 mWhcm(-3) and power densities of 880 Wkg(-1) or 0.56 Wcm(-3), which are an order of magnitude higher than the densities reported for lithium thin-film batteries. These wire-shaped batteries are flexible and light, and 97% of their capacity was maintained after 1000 bending cycles. They are also very elastic as they are based on a modified spring structure, and 84% of the capacity was maintained after stretching for 200 cycles at a strain of 100%. Furthermore, these novel wire-shaped batteries have been woven into lightweight, flexible, and stretchable battery textiles, which reveals possible large-scale applications.