Ultraconformable Integrated Wireless Charging Micro-Supercapacitor Skin

doi:10.1007/s40820-024-01352-1

Abstract

Abstract:

Conformable and wireless charging energy storage devices play important roles in enabling the fast development of wearable, non-contact soft electronics. However, current wireless charging power sources are still restricted by limited flexural angles and fragile connection of components, resulting in the failure expression of performance and constraining their further applications in health monitoring wearables and moveable artificial limbs. Herein, we present an ultracompatible skin-like integrated wireless charging micro-supercapacitor, which building blocks (including electrolyte, electrode and substrate) are all evaporated by liquid precursor. Owing to the infiltration and permeation of the liquid, each part of the integrated device attached firmly with each other, forming a compact and all-in-one configuration. In addition, benefitting from the controllable volume of electrode solution precursor, the electrode thickness is easily regulated varying from 11.7 to 112.5 μm. This prepared thin IWC-MSC skin can fit well with curving human body, and could be wireless charged to store electricity into high capacitive micro-supercapacitors (11.39 F cm⁻³) of the integrated device. We believe this work will shed light on the construction of skin-attachable electronics and irregular sensing microrobots.

Key words: Micro-supercapacitor, Electronic skin, Supercapacitor skin, Wireless charging energy storage device

Chang Gao, Qing You, Jiancheng Huang, Jingye Sun, Xuan Yao, Mingqiang Zhu, Yang Zhao, Tao Deng. Ultraconformable Integrated Wireless Charging Micro-Supercapacitor Skin[J]. Nano-Micro Letters, 2024, 16(1): 123-.

Chang Gao, Qing You, Jiancheng Huang, Jingye Sun, Xuan Yao, Mingqiang Zhu, Yang Zhao, Tao Deng. [J]. Nano-Micro Letters, 2024, 16(1): 123-.

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URL: https://www.qk.sjtu.edu.cn/nml/EN/10.1007/s40820-024-01352-1

https://www.qk.sjtu.edu.cn/nml/EN/Y2024/V16/I1/123

Figures/Tables 5

Fig. 1 a A diagram of constructing mechanism of flexible wireless charging micro-supercapacitor integrated device, which is comprised of wireless charging coil and micro-supercapacitor electrodes in a seamless structure. b Fabrication process of IWC-MSC. c, d Pictures of the flexible and thin IWC-MSC

Fig. 2 a SEM image of the cross section of MSC, including PVDF-HFP/[EMIM][TFSI] solid electrolyte, PE electrode and PVDF-HFP substrate. b Cross section interface between the solid electrolyte and PE electrode. c Magnified image of PE electrode. d SEM image of interdigital electrodes of MSC. e Magnified image of MSC electrode. f SEM image of the surface of MSC electrode. g Raman spectrum, h XRD pattern and i FTIR spectra of PEDOT:PSS and PE conductive layer

Fig. 3 Electrochemical properties of MSC in the IWC-MSC. a Scheme of one MSC in the integrated IWC-MSC. b CV curves measured at scan rates of 20-100 mV s⁻¹. c Galvanostatic charging/discharging curves of a single MSC with different current densities. d IR_drop related to MSC internal resistance vs different discharge current densities. e Nyquist plot of a single MSC unit; The inset is magnified details of the Nyquist plot. f The specific capacitance of a single MSC calculated from the discharging time under different currents. g Power and energy density of MSC. h CV curves of MSCs connected in parallel. i Galvanostatic charging/discharging curves of a group of three MSCs connected in parallel

Fig. 4 Performance characterization of wireless charging coil of IWC-MSC. a Scheme of WCC in IWC-MSC. b The received current, and c voltage of WCC of IWC-MSC under different distance to wireless transmitter during wireless charging process. d Real impedance, e phase and f calculated inductance and imaginary impedance (inset) of WCC

Fig. 5 Display and application of IWC-MSC. a Image of IWC-MSC attaching conformably on the human fist, b arm and c finger. Pictures of d rolled and e crumpled IWC-MSC. f Circuit and i schematic diagram of the wireless charging system. The purple part is IWC-MSC. Photographs of g the wireless transmitting coil of wireless transmitter and h the wireless charging receiver. j A picture of wireless charging system during wireless charging. The inset is red LED lighting during wireless charging. k Induced current and l voltage of WCC during wireless charging process. m Discharging current curve and n discharging voltage curve of MSC after wireless charging

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