Li alloy-based non-volatile actuators

Myoung Sub Noh, Hyunseok Lee, Young Geun Song, Inki Jung, Ruiguang Ning, Sung Wook Paek, Hyun Cheol Song, Seung Hyub Baek, Chong-Yun Kang, Sangtae Kim

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Conventional artificial muscles induce bending by aligning large-sized ions within the electrolyte upon bias application. Such design, alike many other actuator types, suffer from volatile actuation where the actuated position gets lost upon switch-off. Here, we develop a non-volatile artificial muscle with ion insertion electrode materials. Upon bias application, the inserted ions pose stress on the electrodes that sustain even after power shut-off. The demonstrated actuator consists of lithium germanide (LixGe) thin films deposited on both sides of a flexible polyimide (PI) substrate. The device exhibits 35.2 mm displacement when operated at 2 V and generates the blocking force of 0.67 mN. The observed stress and volume expansion reach 248 MPa and 8.2% for the 284 nm Li3Ge thin films, respectively. The actuated position is maintained against gravity with 12.1% decay in the actuated distance after 10 min. The novel actuator type proves the potential use of lithium insertion materials as actuation materials and shows that non-volatile actuation can be realized with ion-insertion electrodes.

Original languageEnglish
Pages (from-to)653-659
Number of pages7
JournalNano Energy
Volume57
DOIs
Publication statusPublished - 2019 Mar 1

Keywords

  • Artificial Muscles
  • Electrochemistry
  • Li Alloys
  • Non-Volatile Actuation

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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  • Cite this

    Noh, M. S., Lee, H., Song, Y. G., Jung, I., Ning, R., Paek, S. W., Song, H. C., Baek, S. H., Kang, C-Y., & Kim, S. (2019). Li alloy-based non-volatile actuators. Nano Energy, 57, 653-659. https://doi.org/10.1016/j.nanoen.2018.12.095