Conductivity and lithiophilicity gradients guide lithium deposition to mitigate short circuits

Jun Pu, Jiachen Li, Kai Zhang, Tao Zhang, Chaowei Li, Haixia Ma, Jia Zhu, Paul V. Braun, Jun Lu () and Huigang Zhang ()
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Jun Pu: Nanjing University
Jiachen Li: Nanjing University
Kai Zhang: University of Chinese Academy of Sciences
Tao Zhang: Argonne National Laboratory
Chaowei Li: University of Chinese Academy of Sciences
Haixia Ma: Northwest University
Jia Zhu: Nanjing University
Paul V. Braun: University of Illinois at Urbana-Champaign
Jun Lu: Argonne National Laboratory
Huigang Zhang: Nanjing University

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Lithium metal anodes hold great promise to enable high-energy battery systems. However, lithium dendrites at the interface between anode and separator pose risks of short circuits and fire, impeding the safe application. In contrast to conventional approaches of suppressing dendrites, here we show a deposition-regulating strategy by electrically passivating the top of a porous nickel scaffold and chemically activating the bottom of the scaffold to form conductivity/lithiophilicity gradients, whereby lithium is guided to deposit preferentially at the bottom of the anode, safely away from the separator. The resulting lithium anodes significantly reduce the probability of dendrite-induced short circuits. Crucially, excellent properties are also demonstrated at extremely high capacity (up to 40 mAh cm−2), high current density, and/or low temperatures (down to −15 °C), which readily induce dendrite shorts in particular. This facile and viable deposition-regulating strategy provides an approach to preferentially deposit lithium in safer positions, enabling a promising anode for next-generation lithium batteries.

Date: 2019
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DOI: 10.1038/s41467-019-09932-1

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