ABSTRACT
Nanolayer manganese dioxide was successfully deposited on car-
bon nanotube by a spontaneous redox reaction between per-
manganate ion and carbon surface. The synthesis mechanism
of the nanolayer manganese dioxide on carbon nanotubes was
proposed via the in situ monitoring of the solution chemistry. Nanolayer manganese dioxide showed a high specific capacity and
high rate capability. Nanosized lithium manganese oxides were
also successfully synthesized and well dispersed on entangled
carbon nanotubes’ web by microwave-hydrothermal. Nanosized
lithium manganese oxide showed excellent high rate capability
and good structural reversibility. The remarkable electrochemical
properties of the nano-architectured material were attributed
to shorter lithium diffusion length, good dispersion, large ionic
supply high electrode/electrolyte interfacial area, and high electrical
conductivity by introducing the entangled carbon nanotubes’ web.
This demonstrated that nano-design of electrode materials, having
high electrochemical utilization, high electronic conductivity, and
large ion supply, is crucial to enable the electrode materials to
have high specific capacity and high rate capability. This synthetic
strategy opens a new avenue for the design of nanoelectrode
materials on the entangled carbon nanotubes’ web in an effective
and facile way.
