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Structural and electrochemical characterization of Sodium ion intercalation of the host material Na1.2V3O8

Title
Structural and electrochemical characterization of Sodium ion intercalation of the host material Na1.2V3O8
Translated Title
Na1.2V3O8의 소듐 이온 탈 삽입의 구조적 및 전기화학적 특성 연구
Authors
Yoo, Ho Chang
DGIST Authors
Yoo, Ho Chang; Hong, Seung Tae; Kim, Jae Hyeon
Advisor(s)
Hong, Seung Tae
Co-Advisor(s)
Kim, Jae Hyeon
Issue Date
2016
Available Date
2016-02-12
Degree Date
2016. 2
Type
Thesis
Keywords
Na1.2V3O8Sodium-ion BatteryStructural analysisSol-gel소듐 이온 배터리전기화학적 특성구조분석용액 분산법 합성
Abstract
Lithium ion batteries (LIBs) represent a real technological advancement in energy storage systems, with many applications in our daily life. In these days, in order to replace LIBs, there have been increasing efforts to develop next generation rechargeable batteries because of the scarceness of lithium resources and the limited theoretical capacity of LIBs. In this work, the electrochemical intercalation of sodium ions into the host material, Na1.2V3O8 has been studied, especially focusing on structural characterization. Na1.2V3O8 was obtained by a sol-gel method. The electrochemical characterization has been performed with 2-electrode home-made type cells. The working electrode consists of Na1.2V3O8 powder, Super P and PAN binder (8:1:1 in weight ratio), which was casted on Al foils. Activated Carbon was used as counter and reference electrodes. Non-aqueous solution of 1M NaClO4 was used as the electrolyte. These results have been obtained through the experiments of cyclic voltammetry, galvanostatic cycle, x-ray diffraction, electron scanning microscopy, energy dispersive x-ray spectroscopy, and elemental mapping. Synthesized Na1.2V3O8 powder was confirmed by X-ray diffraction using Rietveld refinement with GSAS program. The existence of intercalated sodium was confirmed by EDS and elemental mapping. After the cycle number of cells increases, there is no structural degradation. In order to determine the atomic positions of Na+ ions in the interstitial sites of the Na1.2V3O8, detailed structural analysis has been carried out, using the techniques of structure determination from powder X-ray data. ⓒ 2016 DGIST
Table Of Contents
Chapter1 1 -- Introduction 1 -- 1.1 A Basic of Battery 1 -- 1.1.1 Thermodynamic Potential of a Cell2) 2 -- 1.1.2 Secondary Batteries 3 -- 1.2 Na-ion Battery 5 -- 1.2.1 The demand of sodium battery system 5 -- 1.2.2 Basic operating principle of Sodium-ion Batteries 8 -- 1.3 Electrode materials of Sodium Ion Batteries 10 -- 1.3.1 Sodium battery cathode materials 12 -- 1.3.1.1 Review of Na1.2V3O8 as Cathode Material 13 -- 1.3.2 Sodium battery anode materials 16 -- Chapter2 18 -- Synthesis and Characterization of Na1.2V3O8 by sol-gel synthesis for Na-ion Batteries 18 -- 2.1 Introduction 18 -- 2.2 Experimental 19 -- 2.2.1 Synthesis of active material powders 19 -- 2.2.2 Material characterization 20 -- 2.2.3 Preparation of Home-made cell 20 -- 2.2.4 Operational mechanisms of the sodium ion capacitor (SIC) with Home-made cell 23 -- 2.2.5 Electrochemical measurement 25 -- 2.3 Result and Discussion 26 -- 2.3.1 Material Characterization of Na1.2V3O8 26 -- 2.3.2 Electrochemical Properties of Na1.2V3O8 31 -- 2.3.3 Rate Capability of Na1.2V3O8 34 -- 2.3.4 Structural Analysis of the Na1.2V3O8 Electrode upon Cycling 39 -- 2.4 Conclusion 40 -- Chapter 3 42 -- Exploratory experiments for other materials 42 -- References 79 -- 요 약 문 86
URI
http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002228180
http://hdl.handle.net/20.500.11750/1449
DOI
10.22677/thesis.2228180
Degree
Master
Department
Energy Systems Engineering
University
DGIST
Files:
Collection:
Energy Science and EngineeringThesesMaster


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