Advanced Materials, Volume 25, Issue 4, page 644,January 25, 2013.
Chenglin Yan, Wang Xi, Wenping Si, Junwen Deng, Oliver G. Schmidt.
Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstraße 20, Dresden, 01069, Germany.&
Material Systems for Nanoelectronics, Chemnitz University of Technology, Straße der Nationen 62, Chemnitz, 09107, Germany
Chenglin Yan, Wang Xi, and co-workers report on page 539 a novel hybrid tubular structure composed of multilayer Ge and Ti nanomembranes with superior reversible capacity by a strain released method. The high conductivity, fast lithium ion diffusion and good volume tolerance of the material are evaluated by single tube devices. The proof of concept in this work paves the way for integration of microbatteries for chip-scale applications.
Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
The demand for highly efﬁcient lithium-ion batteries to power diverse electric devices is growing fast. Thus, the search for new electrode materials has become an urgent task in building next generation lithium-ion batteries, so as to meet the ever-growing requirements for high capacity and high power density. Recently, researchers at the Institute for Integrative Nanosciences, IFW Dresden reported a novel “swiss roll” shape micro-structure composed of multilayer Ge and Ti nanomembranes with superior reversible capacity (Adv. Mat. 2013, 25, 539). Ge and Ti nanomembranes were deposited onto silicon wafer via electron beam evaporation method and the tubular micro-structures were fabricated via the release of the intrinsic strain accommodated in the nano-bilayer, which then results in a self-rolling process–the so-called “rolled-up nanotechnology”. The whole process is highly efficient and also minimizes the whole system energy that leads to good volume tolerance during repeated charge/discharge cycles. With this “swiss roll” shape material, the team around Dr. Chenglin Yan and Prof. Dr. Oliver G. Schmidt created a microbattery of about 25 µm in diameter and 400 µm in length. The high conductivity, fast lithium ion diffusion and excellent reversibility of the microbattery were evaluated by direct measurement on a single microbattery via a mini-circuit. The proof of concept in this work paves the way for integration of microbatteries with other micro-devices for on- and off-chip applications.