Polyacrylic Acid Assisted Assembly of Oxide Particles and Carbon Nanotubes for High‐Performance Flexible Battery Anodes

DOI: 10.1002/aenm.201401207 that can enable the assembly of hydrophilic nanoparticles with a carbon scaffold. CNTs have been used in electrode materials as the conductive additive with metal oxides for fl exible batteries applications, since they exhibit high aspect ratio, excellent conductivity, and good mechanical properties. However, to make fl exible electrodes, an electrochemically inert substrate (e.g., plastic) is often used to provide enough mechanical strength. For example, fl exible alkaline batteries by implementing multiwalled CNTs and copolymer separator using polyethylene terephthalate fi lm as substrate was demonstrated. [ 17 ] Most of prior works on freestanding electrodes have been based on in situ growth or deposition of oxide thin fi lms on more costly super-long CNTs or super-aligned CNT arrays which show better mechanical properties. For example, super-long CNTs enabled fabrication of freestanding fl exible CNT/V 2 O 5 electrodes with robust structure. [ 18 ] CNTs/Fe 3 O 4 fl exible anodes have been realized by magnetron-sputtered deposition of Fe 3 O 4 nanoparticles onto aligned CNT scaffolds that were drawn from CNT arrays. [ 19 ]