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Article Dans Une Revue Scientific Reports Année : 2020

High Areal capacity porous Sn-Au Alloys with Long cycle Life for Li- ion Microbatteries

Résumé

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 Crates (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.
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Dates et versions

hal-02882289 , version 1 (26-06-2020)

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Sai Gourang Patnaik, Ankita Jadon, Chau Cam Hoang Tran, Alain Estève, Daniel Guay, et al.. High Areal capacity porous Sn-Au Alloys with Long cycle Life for Li- ion Microbatteries. Scientific Reports, 2020, 10 (10405), ⟨10.1038/s41598-020-67309-7⟩. ⟨hal-02882289⟩
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