| 학회 |
한국재료학회 |
| 학술대회 |
2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 |
27권 2호 |
| 발표분야 |
C. 에너지 재료 분과 |
| 제목 |
Suppressed Jahn-Teller effects in manganese hexacyanomanganates with charge redistribution triggered by fast kinetics |
| 초록 |
Na-ion batteries (SIBs), which replace Li with inexpensive Na, have received considerable interest owing to the abundance and even distribution of Na compared to those of Li. Metal hexacyanometallates (known as Prussian Blue analogues (PBAs)) have been considered as the promising cathode materials for SIBs, because of the inherent advantages of PBAs involving large channel sizes that allow accommodating Na ions in aqueous electrolytes without the requirement for dehydration, resulting in fast kinetics. Manganese hexacyanomanganate has the highest capacity among PBAs, accompanying the abnormal insertion of two Na ions in a sub-unit cell. However, the structural distortion by Jahn-Teller effect of high-spin Mn(III) aggravates the cyclability of manganese hexacyanomangate. In this work, we report the charge redistribution mechanism which is the new electrochemical reaction of manganeses hexacyanomanganate under the fast system kinetics. As a result, the unstable Jahn-Teller effect is mitigated and the reversible redox reaction of high-spin Mn(III) maintains for ＞70 days, whereas the counterpart test with only Jahn-Teller effect diminished the reaction for ＜35 days. |
| 저자 |
최아름1, 김태원1, 김민호1, 이석우2, 정영화3, 이현욱1
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| 소속 |
1울산과학기술원, 2난양공과대, 3포항가속기(연) |
| 키워드 |
Sodium ion battery; Water-in-salt electrolyte; Prussian Blue analogue; Jahn-Teller <BR>effect; Charge redistribution
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| E-Mail |
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