Unraveling the Technology behind the Frontrunner LIC ULTIMO to Serve as a Guideline for Optimum Lithium‐Ion Capacitor Design, Assembly, and Characterization

The fast growth experienced by the field of lithium‐ion capacitors (LICs) in the last five years led to tremendous progress in this technology. However, the authors have observed some parallelism with its ultracapacitor (UC) sister technology, where an over‐rapid growth in the last decade resulted i...

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Bibliographic Details
Published in:Advanced energy materials 2021-08, Vol.11 (32), p.n/a
Main Authors: Caizán‐Juanarena, Leire, Arnaiz, María, Gucciardi, Emanuele, Oca, Laura, Bekaert, Emilie, Gandiaga, Iñigo, Ajuria, Jon
Format: Article
Language:English
Subjects:
Assembly
Capacitors
electric double‐layer capacitors
Electrochemical analysis
Flux density
guidelines
Lithium
lithium‐ion capacitors
performance metrics
pre‐lithiation
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Summary:The fast growth experienced by the field of lithium‐ion capacitors (LICs) in the last five years led to tremendous progress in this technology. However, the authors have observed some parallelism with its ultracapacitor (UC) sister technology, where an over‐rapid growth in the last decade resulted in a loss of focus and the need of several tutorials for reconducting incorrect reporting habits. In the light of what may be coming, the authors aim to set this work as a direction to the scientific community and the new researchers in the field to serve as i) a retrospective analysis of the original target for LICs to prevent focus deviation and ii) a guideline for proper LIC design and assembly toward high energy, high power, and long cycle life, as well as for correct electrochemical characterization and reporting. The underlying thread throughout this report is the technology behind the frontrunner LIC ULTIMO, a reference device in the market that presents 3–4 times the energy density of an UC and can stand over 1 million cycles, unraveled by means of ante‐mortem analysis. The development of a well‐balanced lithium‐ion capacitor (LIC) in terms of energy, power, cycle‐life, and cost is not trivial at all. In view of the fast‐growing research community focusing on the area, this work aims to serve as a guideline for proper LIC design and assembly, as well as for a correct electrochemical characterization and reporting.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.202100912