High Areal Capacity Porous Sn-Au Alloys with Long Cycle Life for Li-ion Microbatteries

Abstract Long-term stability is one of the most desired functionalities of energy storage microdevices for wearable electronics, wireless sensor networks and the upcoming Internet of Things. Although Li-ion microbatteries have become the dominant energy-storage technology for on-chip electronics, th...

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Bibliographic Details
Published in:Scientific reports 2020-06, Vol.10 (1), p.10405-10405, Article 10405
Main Authors: Patnaik, Sai Gourang, Jadon, Ankita, Tran, Chau Cam Hoang, Estève, Alain, Guay, Daniel, Pech, David
Format: Article
Language:English
Subjects:
Alloys
Chemical Sciences
Electric power
Electrodes
Electrolytes
Electronics
Energy storage
Engineering Sciences
Internet of Things
Lithium
Material chemistry
Materials
Phase transitions
Thin films
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Summary:Abstract Long-term stability is one of the most desired functionalities of energy storage microdevices for wearable electronics, wireless sensor networks and the upcoming Internet of Things. Although Li-ion microbatteries have become the dominant energy-storage technology for on-chip electronics, the extension of lifetime of these components remains a fundamental hurdle to overcome. Here, we develop an ultra-stable porous anode based on SnAu alloys able to withstand a high specific capacity exceeding 100 µAh cm −2 at 3 C rate for more than 6000 cycles of charge/discharge. Also, this new anode material exhibits low potential (0.2 V versus lithium) and one of the highest specific capacity ever reported at low C-rates (7.3 mAh cm −2 at 0.1 C). We show that the outstanding cyclability is the result of a combination of many factors, including limited volume expansion, as supported by density functional theory calculations. This finding opens new opportunities in design of long-lasting integrated energy storage for self-powered microsystems.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-67309-7