Cited 0 time in webofscience Cited 0 time in scopus

Structure and Electrochemical Properties of Magnesium Ion Intercalation into Vanadium Dioxide

Title
Structure and Electrochemical Properties of Magnesium Ion Intercalation into Vanadium Dioxide
Translated Title
이산화바나듐으로의 마그네슘 이온 삽입의 구조 및 전기 화학적 특성
Authors
Dedy Setiawan
DGIST Authors
Setiawan, Dedy; Lee, HochunHong, Seung-Tae
Advisor(s)
홍승태
Co-Advisor(s)
Hochun Lee
Issue Date
2020
Available Date
2020-06-23
Degree Date
2020-02
Type
Thesis
Description
Battery, Magnesium Ion Battery, Vanadium Dioxide, Energy Storage Materials
Abstract
Magnesium-ion Batteries (MIBs) offer a promising energy density, safety, and low-cost energy storage due to the large abundance of magnesium on Earth. However, only limited candidates have been proposed for MIBs cathode materials. In this study, the structure and electrochemical properties of magnesium ion intercalation into vanadium dioxide (VO2(B)) has been unveiled. VO2(B) was synthesized using a facile hydrothermal method, and confirmed by XRD, HR FE-SEM and TEM as a monoclinic structure with the space group of C 2/m, and a nano-belt morphology. The material shows reversible magnesium intercalation with a discharge capacity of 51.0 mAh g-1 at 25oC at current density of 20 mA g-1 in nonaqueous electrolyte (0.5 M Mg(ClO4)2 in AN). It shows good rate performance at 25, 30, 40, and 50 mA g-1. The cycle performance of VO2(B) still need improvement, as it delivered 62% of the initial capacity after 25 cycles, due to the structural degradation and vanadium dissolution in the electrolyte. VO2(B) also shows magnesium intercalation with a discharge capacity of 114.8 mAh g-1 with an average voltage of ~2.47 V (vs Mg/Mg2+) at 60oC in nonaqueous electrolyte. The structural evolution at pristine, discharge, and charge state revealed the magnesium ion intercalation into VO2(B). The crystal structure of Mg0.11VO2 and detail magnesium ion position in VO2(B) is determined for the first time. It has monoclinic structure with space group of C 2/m and the magnesium ion is located in the largest cavity of VO2(B). TEM-EDX mapping and XPS result also revealed the reversible magnesium intercalation into the material.
Table Of Contents
I. Introduction 1 1.1. Rechargeable batteries 1 1.2. Multivalent ion batteries 2 1.3. Magnesium ion battery 3 1.4. Vanadium dioxides 5 1.5. Research objectives 7 II. Methods 8 2.1. SynTheses 8 2.2. Material characterization 8 2.3. Electrode, electrolyte, and cell preparations 9 2.4. Electrochemical characterization 10 2.5. Structural analysis 10 III. Result and discussion 11 3.1. Structure and morphology 11 3.2. Electrochemical properties 12 3.2.1. Wet vs dry electrolyte 12 3.2.2. Room temperature 16 3.2.3. Elevated temperature 21 3.3. Structural analysis 24 3.4. Elemental analysis 28 IV. Conclusion 30 V. References 31 요 약 문 37 Acknolwledgement 40
URI
http://dgist.dcollection.net/common/orgView/200000281645
http://hdl.handle.net/20.500.11750/11996
DOI
10.22677/Theses.200000281645
Degree
Master
Department
Energy Science&Engineering
University
DGIST
Related Researcher
  • Author Lee, Hochun Electrochemistry Laboratory for Sustainable Energy(ELSE)
  • Research Interests Lithium-ion batteries; Novel Materials for rechargeable batteries; Novel energy conversion;storage systems; Electrochemistry; 리튬이차전지; 이차전지용 신규 전극 및 전해액; 신규 에너지변환 및 저장 시스템; 전기화학
Files:
Collection:
Department of Energy Science and EngineeringThesesMaster


qrcode mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE