A Study on Nano-Hybrid Interface Modification of SnSb-Based Anode Material for Enhanced Sodium-Ion Storage Performance
나노 하이브리드 표면개질에 의한 소듐 이온 전지 합금계 SnSb 음극소재 성능향상 연구
- 주제(키워드) Sodium-ion battery , SnSb , heterostruture , nanoindentation
- 발행기관 고려대학교 대학원
- 지도교수 강윤찬, 김상옥
- 발행년도 2024
- 학위수여년월 2024. 2
- 학위명 석사
- 학과 대학원 신소재공학과
- 세부전공 신소재공학 전공
- 원문페이지 71 p
- 실제URI http://www.dcollection.net/handler/korea/000000279473
- UCI I804:11009-000000279473
- DOI 10.23186/korea.000000279473.11009.0000385
- 본문언어 영어
초록/요약
Sodium-ion batteries (SIBs) are being researched as a next generation for energy storage option. Their potential advantages over traditional lithium-ion batteries include the abundance of sodium and potential for low cost materials. There is high demand for high-energy density SIBs, however, their practical application has been hindered by a lack of proper electrochemical storage technology. Bimetallic SnSb alloy has shown outstanding performance as an SIB anode with high theoretical capacities and electrical conductivities among all candidates. However, significant challenges arise from the considerable volume variations during sodium-ion intercalation/de-intercalation, causing a rapid decline in capacity and forming an undesirable solid electrolyte interphase layer. In order to improve the performance of capacity degradation due to side reactions occurring at the electrode surface, which is presented to forming a structural stability through surface modification. carbonaceous matrix is used to maintain performance by enhance electrode for electrochemical stability. however, the matrix presents insufficient mechanical robustness and elasticity, which affect the electrode deterioration at high-rate performance. In this study, we report on a heterostructure coating design utilizing SiOC, characterized by high stability, conductivity, and a porous structure. C@SiOC bilayer provide structural stability by alleviating side reactions such as the electrode interface and volume variation. Furthermore, the mesoporous characteristics of SiOC present the adaptability to sodium ion diffusion kinetics during sodiation, while leading to high-rate performance for electrode. Nanoindentation was conducted as post-mortem analysis to suggest the relationship between interfacial side reactions and electrochemical performances.
more목차
CHAPTER 1. INTRODUCTION 1
CHAPTER 2. EXPERIMENTAL METHOD 5
2.1 MATERIAL PREPERATION 5
2.2 MATERIAL CHARACTERIZATION 6
2.3 ELECTROCHEMICAL MEASUREMENT 7
CHAPTER 3. RESULT AND DISCUSSION 8
3.1 MATERIAL CHARACTERIZATION 8
3.2 ELECTROCHEMICAL ANALYSIS 27
3.3 ELECTROCHEMICAL PERFORMANCE 33
3.4 POST-MORTEM ANALYSIS 38
CHAPTER 4. CONCLUSIONS 53
REFERENCES 55
