Li Alloy-based Non-Volatile Actuators
- Li Alloy-based Non-Volatile Actuators
- 강종윤; 송현철; 백승협; 김상태; 이현석; 노명섭; 정인기; 영서광; 송영근; 백승욱
- Issue Date
- Nano energy
- VOL 57-659
- 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.
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