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Reversible Sodium Metal Electrodes: Is Fluorine an Essential Interphasial Component?

ABSTRACT: Alkaline metals are an ideal negative electrode for rechargeable batteries. Forming a fluorine-rich interphase by a fluorinated electrolyte is recognized as key to utilizing lithium metal electrodes, and the same strategy is being applied to sodium metal electrodes. However, their reversible plating/stripping reactions have yet to be achieved. Herein, we report a contrary concept of fluorine-free electrolytes for sodium metal batteries. A sodium tetraphenylborate/monoglyme electrolyte enables reversible sodium plating/stripping at an average Coulombic efficiency of 99.85?% over 300 cycles. Importantly, the interphase is composed mainly of carbon, oxygen, and sodium elements with a negligible presence of fluorine, but it has both high stability and extremely low resistance. This work suggests a new direction for stabilizing sodium metal electrodes via fluorine-free interphases.

SUBMITTER: Doi K

PROVIDER: S-EPMC6593729 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature

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Reversible Sodium Metal Electrodes: Is Fluorine an Essential Interphasial Component?

Doi Kyosuke K Yamada Yuki Y Okoshi Masaki M Ono Junichi J Chou Chien-Pin CP Nakai Hiromi H Yamada Atsuo A

Angewandte Chemie (International ed. in English) 20190514 24

Alkaline metals are an ideal negative electrode for rechargeable batteries. Forming a fluorine-rich interphase by a fluorinated electrolyte is recognized as key to utilizing lithium metal electrodes, and the same strategy is being applied to sodium metal electrodes. However, their reversible plating/stripping reactions have yet to be achieved. Herein, we report a contrary concept of fluorine-free electrolytes for sodium metal batteries. A sodium tetraphenylborate/monoglyme electrolyte enables re ...[more]

PMID: 30951223

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