DOAJ Open Access 2020

Reversible and High-rate Hard Carbon Negative Electrodes in a Fluorine-free Sodium-salt Electrolyte

Yusuke MORIKAWA Yuki YAMADA Kyosuke DOI Shin-ichi NISHIMURA Atsuo YAMADA

Lihat Sumber DOI

Abstrak

Hard carbon is widely studied as a promising negative electrode in sodium-ion batteries. To achieve its stable charge-discharge reaction, a fluorine-rich passivation film arising from a fluorinated salt or solvent in an electrolyte was demonstrated to be effective, but its essential role remained unclear. Here, we report a sodium tetraphenylborate (NaBPh4)/1,2-dimethoxyethane (DME) electrolyte that is free from fluorine but enables the highly stable and high-rate charge-discharge cycling of hard carbon electrodes as compared to other combinations of Na salts and solvents. Surface analysis of the cycled electrode shows that the NaBPh4 is not decomposed during the cycle and that solid electrolyte interphase (SEI) is derived from DME. Hence, fluorine-based components are not indispensable to stabilize the hard carbon/electrolyte interface. The DME-derived SEI, though containing no F component, can highly stabilize the interface to enable the reversible and high-rate cycling of hard carbon.

Topik & Kata Kunci

Technology Physical and theoretical chemistry

Penulis (5)

Yusuke MORIKAWA

Yuki YAMADA

Kyosuke DOI

Shin-ichi NISHIMURA

Atsuo YAMADA

Format Sitasi

APA MLA BibTeX

MORIKAWA, Y., YAMADA, Y., DOI, K., NISHIMURA, S., YAMADA, A. (2020). Reversible and High-rate Hard Carbon Negative Electrodes in a Fluorine-free Sodium-salt Electrolyte. https://doi.org/10.5796/electrochemistry.19-00073

Akses Cepat

Lihat di Sumber doi.org/10.5796/electrochemistry.19-00073

Informasi Jurnal

Tahun Terbit: 2020
Sumber Database: DOAJ
DOI: 10.5796/electrochemistry.19-00073
Akses: Open Access ✓