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Structural and Electrochemical Characterizations of FeV3O8 as a Host Material for Rechargeable Li-ion Batteries

Title
Structural and Electrochemical Characterizations of FeV3O8 as a Host Material for Rechargeable Li-ion Batteries
Translated Title
리튬이차전지 양극 물질 개발을 위한 FeV3O8의 구조 및 전기화학분석
Authors
Lee, Sang Hun
DGIST Authors
Lee, Sang Hun; 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
monoclinic FeV3O8Tunnel-like structure1-D diffusion pathpositive electrode단사정계 FeV3O8터널 형상 구조1차원 확산경로양극물질
Abstract
We investigate how affected by intercalation chemistry of lithium ion into monoclinic FeV3O8 tunnel structure. By using high temperature solid state synthetic method, rod-type FeV3O8 powder could be obtained and then, confirm powder phase and morphology by using SEM and XRD. In order to determine lithium ion intercalation profiles into those structure, several structural and electrochemical features such as cyclic voltammetry, galvanostatic discharge/charge curve and XRD analysis were conducted. Although FeV3O8 as a positive electrode would be operated with unfavorable performance that could not be utilized to satisfy performances of EV needs given period of time, we discovered possibility of these material through structural and electrochemical studies during project. As a novel positive material, FeV3O8 vs. Lithium cell discharged at 0.2C (1C = 151.9mAh g-1) delivered 63.51mAh/g of reversible capacity with the electrochemically active redox reaction. In the voltage range between 2.0 – 3.5V, the cell exhibits one voltage plateaus with well- defined discharge voltage near 2.7 V, and a coulombic efficiency of approximately 99 percent. Unfortunately, FeV3O8 has poor high-rate performances, the cell exhibits a specific capacity of about 5 mAh g-1 at 10C. These results are caused to the crystallized particle morphology. We have been investigating several countermeasures for contributing lithium ion intercalation into FeV3O8 structure. In order to improve kinetic properties, the change of particle size and morphology to submicron size has to be considered. As an other example, additional coating process onto particles surface using high conductivity materials could be increased profiles of kinetic into the host materials. ⓒ 2016 DGIST
Table Of Contents
1. Introduction 1 -- 1.1 The principle of lithium based rechargeable batteries 2 -- 1.2 The cathode candidates for Li based battery system 6 -- 1.2.1 Literature survey 6 -- 1.2.2 Tunnel structure, monoclinic FeV3O8 8 -- 2. Experiments 10 -- 2.1 Preparation of sample 10 -- 2.2 The material characterization 10 -- 2.3 Preparation of electrodes and electrolyte 11 -- 3. Results and Discussion 12 -- 3.1 Material characterizations 12 -- 3.2 Electrochemical characterizations 15 -- 4. Conclusions 17 -- 요약문 19 -- ※ Appendix 22 -- References 48 --
URI
http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002227994
http://hdl.handle.net/20.500.11750/1454
DOI
10.22677/thesis.2227994
Degree
Master
Department
Energy Systems Engineering
University
DGIST
Files:
Collection:
Energy Science and EngineeringThesesMaster


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