Li Alloy-based Non-Volatile Actuators

Title
Li Alloy-based Non-Volatile Actuators
Authors
강종윤송현철백승협김상태이현석노명섭정인기영서광송영근백승욱
Issue Date
2019-03
Publisher
Nano energy
Citation
VOL 57-659
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.
URI
http://pubs.kist.re.kr/handle/201004/68945
ISSN
2211-2855
Appears in Collections:
KIST Publication > Article
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