Micro-scale electrochemical energy storage systems with high system efficiency, superior cell count density, adjustable capacitance and output voltage show promise for electronic devices shrink.
A joint research team led by Professor Wu Zhongshuai and Professor Lu Yao from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS), in collaboration with Professor Cheng Huiming’s team from CAS Institute of Advanced Technology and Shenzhen Metal Research Institute, have developed monolithically integrated micro-supercapacitors with extremely high system volumetric efficiency and area output voltage.
The study was published in National Science Review on November 26th.
Micro-supercapacitors (MSCs) are digitized on-chip, have no separators and external metal connection wires, and feature reliable electrochemical performance and adjustable connectivity, with can increase cell count density and system performance for monolithic integrated MSCs (MIMSCs) with desired customization within a limited space.
However, the production of fully functional compact MIMSCs with high system efficiency, superior cell count density and tunable performance remains a challenge. This is due to the difficulty of accurately depositing electrolytes on dense MSCs for electrochemical isolation, sacrificing electrochemical performance in complex microfabrication processes, and limiting performance homogeneity between multiple individual cells in large-scale arrays.
In this study, the researchers developed a universal and high-throughput microfabrication strategy to address the above problems by combining multi-step lithography, MXene microelectrode inkjet printing and controllable three-dimensional (3D) gel electrolyte printing.
They created a monolithic integration of electrochemically isolated micro-supercapacitors in close proximity by leveraging high-resolution micro-generation techniques for microelectrode deposition and 3D printing for deposition. Precise electrolyte deposition.
They obtained MIMSCs with a high area-number density of 28 cm-2 (400 cells over 3.5×4.1 cm2), a record area output voltage of 75.6 Vcm-2an acceptable system volumetric energy Density is 9.8 mWh cm-3and high-capacitance maintained 92 % after 4,000 cycles at 162 V output voltage.
“This work paves the way for monolithically integrated and micro-energy storage assemblies to power microelectronics in the future,” said Professor Wu.
Sen Wang et al, Monolithic integrated micro-supercapacitor with extremely high system volumetric efficiency and area output voltage, National Science Review (2022). DOI: 10.1093/nsr/nwac271
Chinese Academy of Sciences
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