Energy storage systems including supercapacitors and lithium ion batteries typically appear
in a rigid plate which is unfavorable for many applications, especially in the fields of portable
and highly integrated equipments which require small size, light weight, and high
flexibility.[1–3] As a result, flexible supercapacitors and batteries mainly in a film format have
been widely investigated, while wire-shaped energy storage devices are rare.[4, 5]
However, compared with the conventional planar structure, a wire device can be easily …

Aligned carbon nanotube/MnO 2 composite fibers are twisted to produce wire‐shaped
supercapacitors and lithium ion batteries with high performances. The energy densities
achieve 92.84 and 35.74 mWh/cm 3 while the power densities reach 3.87 and 2.43 W/cm 3
during the charge and discharge process, respectively. The wire structure enables many
unique applications, eg, being woven into electronic textiles. More details can be found in
the article by Huisheng Peng, Yonggang Wang and co‐workers on page 1155.