High-Performance Packaged 3D Lithium-Ion Microbatteries Fabricated Using Imprint Lithography.
basic_science · Level V
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- Record sourced from PubMed, PMID 33241634.
- Also identified by DOI 10.1002/adma.202006229.
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Abstract
Fabrication of high-energy-density and high-power-density packaged long-cycle-life rechargeable microbatteries remains a considerable challenge. Here, high-performance microbatteries with high active volume fraction, thick, 3D-structured electrodes (V<sub>2</sub> O<sub>5</sub> cathode and Li metal anode) are realized through a combination of imprint lithography, self-assembly, and electrodeposition. To assist the critical challenge of hermetic packaging, the microbattery is infilled with a gel electrolyte. The packaged cell exhibits high areal energy and power densities of 1.24 J cm<sup>-2</sup> and 75.5 mW cm<sup>-2</sup> , respectively, and can be cycled 550 times in argon or 200 times in air with 75% capacity retention of the initial discharge capacity. An unpackaged cell, using a liquid electrolyte, provides a power density of 218 mW cm<sup>-2</sup> . As far as it is known, the microbatteries have the highest peak power density among all reported microbatteries.