Reversible and High-rate Hard Carbon Negative Electrodes in a Fluorine-free Sodium-salt Electrolyte
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 un...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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The Electrochemical Society of Japan
2020-05-01
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| Series: | Electrochemistry |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/electrochemistry/88/3/88_19-00073/_pdf/-char/en |
| _version_ | 1797968455501086720 |
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| author | Yusuke MORIKAWA Yuki YAMADA Kyosuke DOI Shin-ichi NISHIMURA Atsuo YAMADA |
| author_facet | Yusuke MORIKAWA Yuki YAMADA Kyosuke DOI Shin-ichi NISHIMURA Atsuo YAMADA |
| author_sort | Yusuke MORIKAWA |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T02:47:10Z |
| format | Article |
| id | doaj.art-029987bd4ba54f24943432420c0e9e78 |
| institution | Directory Open Access Journal |
| issn | 2186-2451 |
| language | English |
| last_indexed | 2024-04-11T02:47:10Z |
| publishDate | 2020-05-01 |
| publisher | The Electrochemical Society of Japan |
| record_format | Article |
| series | Electrochemistry |
| spelling | doaj.art-029987bd4ba54f24943432420c0e9e782023-01-02T17:33:18ZengThe Electrochemical Society of JapanElectrochemistry2186-24512020-05-0188315115610.5796/electrochemistry.19-00073electrochemistryReversible and High-rate Hard Carbon Negative Electrodes in a Fluorine-free Sodium-salt ElectrolyteYusuke MORIKAWA0Yuki YAMADA1Kyosuke DOI2Shin-ichi NISHIMURA3Atsuo YAMADA4Department of Chemical System Engineering, The University of TokyoDepartment of Chemical System Engineering, The University of TokyoDepartment of Chemical System Engineering, The University of TokyoDepartment of Chemical System Engineering, The University of TokyoDepartment of Chemical System Engineering, The University of TokyoHard 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.https://www.jstage.jst.go.jp/article/electrochemistry/88/3/88_19-00073/_pdf/-char/ensodium-ion batterieshard carbonelectrolytefluorine |
| spellingShingle | Yusuke MORIKAWA Yuki YAMADA Kyosuke DOI Shin-ichi NISHIMURA Atsuo YAMADA Reversible and High-rate Hard Carbon Negative Electrodes in a Fluorine-free Sodium-salt Electrolyte Electrochemistry sodium-ion batteries hard carbon electrolyte fluorine |
| title | Reversible and High-rate Hard Carbon Negative Electrodes in a Fluorine-free Sodium-salt Electrolyte |
| title_full | Reversible and High-rate Hard Carbon Negative Electrodes in a Fluorine-free Sodium-salt Electrolyte |
| title_fullStr | Reversible and High-rate Hard Carbon Negative Electrodes in a Fluorine-free Sodium-salt Electrolyte |
| title_full_unstemmed | Reversible and High-rate Hard Carbon Negative Electrodes in a Fluorine-free Sodium-salt Electrolyte |
| title_short | Reversible and High-rate Hard Carbon Negative Electrodes in a Fluorine-free Sodium-salt Electrolyte |
| title_sort | reversible and high rate hard carbon negative electrodes in a fluorine free sodium salt electrolyte |
| topic | sodium-ion batteries hard carbon electrolyte fluorine |
| url | https://www.jstage.jst.go.jp/article/electrochemistry/88/3/88_19-00073/_pdf/-char/en |
| work_keys_str_mv | AT yusukemorikawa reversibleandhighratehardcarbonnegativeelectrodesinafluorinefreesodiumsaltelectrolyte AT yukiyamada reversibleandhighratehardcarbonnegativeelectrodesinafluorinefreesodiumsaltelectrolyte AT kyosukedoi reversibleandhighratehardcarbonnegativeelectrodesinafluorinefreesodiumsaltelectrolyte AT shinichinishimura reversibleandhighratehardcarbonnegativeelectrodesinafluorinefreesodiumsaltelectrolyte AT atsuoyamada reversibleandhighratehardcarbonnegativeelectrodesinafluorinefreesodiumsaltelectrolyte |