Direct Proof of the Reversible Dissolution/Deposition of Mn2+/Mn4+ for Mild‐Acid Zn‐MnO2 Batteries with Porous Carbon Interlayers
Abstract Mild‐acid Zn‐MnO2 batteries have been considered a promising alternative to Li‐ion batteries for large scale energy storage systems because of their high safety. There have been remarkable improvements in the electrochemical performance of Zn‐MnO2 batteries, although the reaction mechanism...
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| Format: | Article |
| Language: | English |
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Wiley
2021-03-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.202003714 |
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| author | Hyeonseok Moon Kwang‐Ho Ha Yuwon Park Jungho Lee Mi‐Sook Kwon Jungwoo Lim Min‐Ho Lee Dong‐Hyun Kim Jin H. Choi Jeong‐Hee Choi Kyu Tae Lee |
| author_facet | Hyeonseok Moon Kwang‐Ho Ha Yuwon Park Jungho Lee Mi‐Sook Kwon Jungwoo Lim Min‐Ho Lee Dong‐Hyun Kim Jin H. Choi Jeong‐Hee Choi Kyu Tae Lee |
| author_sort | Hyeonseok Moon |
| collection | DOAJ |
| description | Abstract Mild‐acid Zn‐MnO2 batteries have been considered a promising alternative to Li‐ion batteries for large scale energy storage systems because of their high safety. There have been remarkable improvements in the electrochemical performance of Zn‐MnO2 batteries, although the reaction mechanism of the MnO2 cathode is not fully understood and still remains controversial. Herein, the reversible dissolution/deposition (Mn2+/Mn4+) mechanism of the MnO2 cathode through a 2e− reaction is directly evidenced using solution‐based analyses, including electron spin resonance spectroscopy and the designed electrochemical experiments. Solid MnO2 (Mn4+) is reduced into Mn2+ (aq) dissolved in the electrolyte during discharge. Mn2+ ions are then deposited on the cathode surface in the form of the mixture of the poorly crystalline Zn‐containing MnO2 compounds through two‐step reactions during charge. Moreover, the failure mechanism of mild‐acid Zn‐MnO2 batteries is elucidated in terms of the loss of electrochemically active Mn2+. In this regard, a porous carbon interlayer is introduced to entrap the dissolved Mn2+ ions. The carbon interlayer suppresses the loss of Mn2+ during cycling, resulting in the excellent electrochemical performance of pouch‐type Zn‐MnO2 cells, such as negligible capacity fading over 100 cycles. These findings provide fundamental insights into strategies to improve the electrochemical performance of aqueous Zn‐MnO2 batteries. |
| first_indexed | 2024-12-19T06:15:38Z |
| format | Article |
| id | doaj.art-1aebafa44c2b432bb7f307599cf6f044 |
| institution | Directory Open Access Journal |
| issn | 2198-3844 |
| language | English |
| last_indexed | 2024-12-19T06:15:38Z |
| publishDate | 2021-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advanced Science |
| spelling | doaj.art-1aebafa44c2b432bb7f307599cf6f0442022-12-21T20:32:52ZengWileyAdvanced Science2198-38442021-03-0186n/an/a10.1002/advs.202003714Direct Proof of the Reversible Dissolution/Deposition of Mn2+/Mn4+ for Mild‐Acid Zn‐MnO2 Batteries with Porous Carbon InterlayersHyeonseok Moon0Kwang‐Ho Ha1Yuwon Park2Jungho Lee3Mi‐Sook Kwon4Jungwoo Lim5Min‐Ho Lee6Dong‐Hyun Kim7Jin H. Choi8Jeong‐Hee Choi9Kyu Tae Lee10School of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of KoreaSchool of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of KoreaSchool of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of KoreaSchool of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of KoreaSchool of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of KoreaSchool of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of KoreaNext Generation Battery Research Center Korea Electrotechnology Research Institute Bulmosan‐ro 10beon‐gil, Seongsan‐gu Changwon‐si Gyeongsangnam‐do 51543 Republic of KoreaNext Generation Battery Research Center Korea Electrotechnology Research Institute Bulmosan‐ro 10beon‐gil, Seongsan‐gu Changwon‐si Gyeongsangnam‐do 51543 Republic of KoreaKorea Electric Power Corporation Research Institute 105 Munji‐Ro Yuseong‐Gu Daejeon 34056 Republic of KoreaNext Generation Battery Research Center Korea Electrotechnology Research Institute Bulmosan‐ro 10beon‐gil, Seongsan‐gu Changwon‐si Gyeongsangnam‐do 51543 Republic of KoreaSchool of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of KoreaAbstract Mild‐acid Zn‐MnO2 batteries have been considered a promising alternative to Li‐ion batteries for large scale energy storage systems because of their high safety. There have been remarkable improvements in the electrochemical performance of Zn‐MnO2 batteries, although the reaction mechanism of the MnO2 cathode is not fully understood and still remains controversial. Herein, the reversible dissolution/deposition (Mn2+/Mn4+) mechanism of the MnO2 cathode through a 2e− reaction is directly evidenced using solution‐based analyses, including electron spin resonance spectroscopy and the designed electrochemical experiments. Solid MnO2 (Mn4+) is reduced into Mn2+ (aq) dissolved in the electrolyte during discharge. Mn2+ ions are then deposited on the cathode surface in the form of the mixture of the poorly crystalline Zn‐containing MnO2 compounds through two‐step reactions during charge. Moreover, the failure mechanism of mild‐acid Zn‐MnO2 batteries is elucidated in terms of the loss of electrochemically active Mn2+. In this regard, a porous carbon interlayer is introduced to entrap the dissolved Mn2+ ions. The carbon interlayer suppresses the loss of Mn2+ during cycling, resulting in the excellent electrochemical performance of pouch‐type Zn‐MnO2 cells, such as negligible capacity fading over 100 cycles. These findings provide fundamental insights into strategies to improve the electrochemical performance of aqueous Zn‐MnO2 batteries.https://doi.org/10.1002/advs.202003714aqueous batteriesmild acid electrolytesporous carbon interlayersreaction mechanismsZn‐MnO2 batteries |
| spellingShingle | Hyeonseok Moon Kwang‐Ho Ha Yuwon Park Jungho Lee Mi‐Sook Kwon Jungwoo Lim Min‐Ho Lee Dong‐Hyun Kim Jin H. Choi Jeong‐Hee Choi Kyu Tae Lee Direct Proof of the Reversible Dissolution/Deposition of Mn2+/Mn4+ for Mild‐Acid Zn‐MnO2 Batteries with Porous Carbon Interlayers Advanced Science aqueous batteries mild acid electrolytes porous carbon interlayers reaction mechanisms Zn‐MnO2 batteries |
| title | Direct Proof of the Reversible Dissolution/Deposition of Mn2+/Mn4+ for Mild‐Acid Zn‐MnO2 Batteries with Porous Carbon Interlayers |
| title_full | Direct Proof of the Reversible Dissolution/Deposition of Mn2+/Mn4+ for Mild‐Acid Zn‐MnO2 Batteries with Porous Carbon Interlayers |
| title_fullStr | Direct Proof of the Reversible Dissolution/Deposition of Mn2+/Mn4+ for Mild‐Acid Zn‐MnO2 Batteries with Porous Carbon Interlayers |
| title_full_unstemmed | Direct Proof of the Reversible Dissolution/Deposition of Mn2+/Mn4+ for Mild‐Acid Zn‐MnO2 Batteries with Porous Carbon Interlayers |
| title_short | Direct Proof of the Reversible Dissolution/Deposition of Mn2+/Mn4+ for Mild‐Acid Zn‐MnO2 Batteries with Porous Carbon Interlayers |
| title_sort | direct proof of the reversible dissolution deposition of mn2 mn4 for mild acid zn mno2 batteries with porous carbon interlayers |
| topic | aqueous batteries mild acid electrolytes porous carbon interlayers reaction mechanisms Zn‐MnO2 batteries |
| url | https://doi.org/10.1002/advs.202003714 |
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