Extending nonhysteretic oxygen capacity in Ni-Mn binary oxides : doping with Vanadium-Ions theoretical and experimental studies
| 000 | 00000nam c2200205 c 4500 | |
| 001 | 000046132291 | |
| 005 | 20221031092929 | |
| 007 | ta | |
| 008 | 220628s2022 ulkad bmAC 000c eng | |
| 040 | ▼a 211009 ▼c 211009 ▼d 211009 | |
| 085 | 0 | ▼a 0510 ▼2 KDCP |
| 090 | ▼a 0510 ▼b 6D5 ▼c 1227 | |
| 100 | 1 | ▼a 구찬우, ▼g 具燦佑 |
| 245 | 1 0 | ▼a Extending nonhysteretic oxygen capacity in Ni-Mn binary oxides : ▼b doping with Vanadium-Ions theoretical and experimental studies / ▼d 구찬우 |
| 260 | ▼a Seoul : ▼b Graduate School, Korea University, ▼c 2022 | |
| 300 | ▼a xiii, 49장 : ▼b 천연색삽화, 도표 ; ▼c 26 cm | |
| 500 | ▼a 지도교수: 유승호 | |
| 502 | 0 | ▼a 학위논문(석사)-- ▼b 고려대학교 대학원: ▼c 화공생명공학과, ▼d 2022. 8 |
| 504 | ▼a 참고문헌: 장 45-49 | |
| 530 | ▼a PDF 파일로도 이용가능; ▼c Requires PDF file reader(application/pdf) | |
| 653 | ▼a Layered oxides ▼a Sodium-Ion batteries ▼a V substitution ▼a First-principles calculations ▼a Oxygen redox | |
| 776 | 0 | ▼t Extending Nonhysteretic Oxygen Capacity in Ni-Mn Binary Oxides ▼w (DCOLL211009)000000268945 |
| 900 | 1 0 | ▼a Koo, Chanwoo, ▼e 저 |
| 900 | 1 0 | ▼a 유승호, ▼g 兪承鎬, ▼e 지도교수 |
| 900 | 1 0 | ▼a Yu, Seung-Ho, ▼e 지도교수 |
| 945 | ▼a ITMT |
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| No. | Title | Service |
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| 1 | Extending nonhysteretic oxygen capacity in Ni-Mn binary oxides : doping with Vanadium-Ions theoretical and experimental studies (9회 열람) |
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| No. 1 | Location Science & Engineering Library/Stacks(Thesis)/ | Call Number 0510 6D5 1227 | Accession No. 123069546 | Availability Available | Due Date | Make a Reservation | Service |
| No. 2 | Location Science & Engineering Library/Stacks(Thesis)/ | Call Number 0510 6D5 1227 | Accession No. 123069547 | Availability Available | Due Date | Make a Reservation | Service |
Contents information
Abstract
Abstract Environmental degradation and resource depletion have brought a lot of attention to sustainable and eco-friendly energy sources.1 Developing high-energy-density cathode material for alternating lithium-ion batteries (LIBs) is crucial to fulfill the demands of a reasonable price.1 In this regard, sodium-ion batteries (SIBs) are considered as promising alternatives for large-scale applications. To improve the energy and power densities, a considerable amount of spotlight is placed on activating the oxygen redox (OR) process of Na layered-oxide cathodes because its reaction occurs in a high voltage region (~4.2 V) upon charging.1 Herein, we compare P2-type Ni-Mn binary oxide, Na2/3[Mn3/4Ni1/4]O2 (NMNO) and a V-doped Na2/3[Mn3/4Ni1/4]O2 (V-NMNO) based on a combined study of experiments and first-principles calculations.1 It is found that V-NMNO, compared with the bare material, extends the nonhysteretic oxygen capacity and exhibits an OR activity with prolonged and flatter plateau upon charging.1 This oxide provides a minimal voltage hysteresis that indicates high reversibility of OR reaction.1 Its remarkably well-defined plateau is attributed to the stabilization of the phase transition upon cycling to 4.3 V, which can be theoretically understood by the comparison of the formation energies of NMNO and V-NMNO.1 In addition, our experimental and computational results demonstrate that the nonhysteretic oxygen capacity combined with the partial Ni redox is extended under the host Ni−Mn binary oxide via V-substitution. From the systematic understandings on the two oxide models, our findings provide an intriguing direction for harnessing the full potential of OR reactions for high-energy-density SIBs.1
Table of Contents
Contents Abstract vi List of Figures viii List of Tables xiii 1. Introduction 1 2. Experimental section 5 2.1. Synthesis of P2-Type Na2/3[VxMn3/4-xNi1/4]O2 5 2.2. Characterizations 6 2.3. Electrochemical Measurements 7 2.4. First-Principles Calculations 8 3. Results and Discussion 9 3.1. Materials and Electrochemical Characterization 9 3.2. Operando Analyzing Structural Evolution 21 3.3. Understanding Thermodynamic Phase stabilities of V-NMNO and NMNO 26 3.4. Charge Compensation Mechanism of V-NMNO and NMNO 32 4. Conclusion 43 References 45