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 Wh kg−1 or 17.7 mWh cm−3 and power densities of 880 W kg−1 or 0.56 W cm−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. Super‐stretchy: A novel and safe wire‐shaped lithium‐ion battery consists of two composite yarns, which were made from aligned multi‐walled carbon nanotubes (MWCNT) and lithium titanium oxide (LTO) or lithium manganese oxide (LMO), as the anode and cathode. These wire‐shaped batteries were woven into light, flexible, and stretchable battery textiles.