| 학회 |
한국재료학회 |
| 학술대회 |
2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 |
27권 2호 |
| 발표분야 |
C. 에너지 재료 분과 |
| 제목 |
O3 type NaCrO2 cathode by cationic and transition metal co-substitution strategy for high-energy sodium ion batteries |
| 초록 |
The development of advanced cathode materials with high operating voltage and high reversible capacity is essential to promote the practical realization of sodium ion battery (SIB) technology. Here, O3 type Na0.9Ca0.035Cr0.97Ti0.03O2 is designed by replacing Ca and Ti with O3 type NaCrO2 and is proposed as a new type of cathode material for high-energy practical SIB. On the basis of stoichiometry, the alkaline earth metal ions are successfully incorporated into the NaO6 octahedron of NaCrO2 by replacing a single Ca2+ with every two Na+ ions, while Ti4+ ions are replaced by Cr3+ ions into the CrO6 octahedrons Body position, resulting in the formation of Na+ vacancies in the Na+ layer for charge compensation. This co-substitution strategy enhances the structural stability of the O3 type Na0.9Ca0.035Cr0.97Ti0.03O2 cathode, which is caused by the presence of fixed Ca2+ ions between the Ti-O bond stronger than the Cr-O bond and CrO6 pieces of induction. These structural features suppress irreversible phase transitions and provide excellent Na+ ion diffusion kinetics in a wide operating voltage window of 1.5-3.8 V, enabling the cathode to provide 95% high initial Coulomb efficiency and maintain its initial Coulomb efficiency. Capacity after 1000 cycles at 90% 10 C rate. In addition, the cathode guarantees the practical applicability for long-term cycling in a bag-type full battery using a hard carbon anode, and durability against water. |
| 저자 |
Hyuk Kang, Seulgi Lee, Sohyun Park, Muhammad Hilmy Alfaruqi, Sungjin Kim, Jaekook Kim, Jang-Yeon Hwang
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| 소속 |
Chonnam National Univ. |
| 키워드 |
Sodium Secondary Battery |
| E-Mail |
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