Rechargeable magnesium/oxygen batteries: Reaction mechanisms and their dependence on electrolyte composition
Başlık çevirisi mevcut değil.
- Tez No: 540376
- Danışmanlar: Prof. DONALD J. SIEGEL, Prof. CHARLES MONROE
- Tez Türü: Doktora
- Konular: Metalurji Mühendisliği, Metallurgical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2016
- Dil: İngilizce
- Üniversite: University of Michigan
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 112
Özet
Özet yok.
Özet (Çeviri)
Electrochemical energy storage devices that are robust, energy-dense, and cheap will accelerate the commercialization of electric vehicles. Magnesium/oxygen (Mg/O2) batteries are a promising system with the potential for very high energy densities. Furthermore, a rechargeable Mg/O2 battery could be a cheaper and potentially safer alternative to the lithium (Li)-ion batteries currently in use. The goal of this thesis is to explore candidate magnesium electrolytes for use in Mg/O2 batteries, and to assess the reaction mechanisms and performance of Mg/O2 cells that employ these electrolytes. We first consider electrolytes based on ionic liquids (ILs), which are attractive electrolytes for batteries because they are nonflammable and nonvolatile. The electrochemistry of Mg salts in room-temper voltammetry. Borohydride (BH4 –), trifluoromethane- step mechanism in favor of direct electrochemical MgOx formation would raise the discharge potential and, consequently, the energy density. The performance of the preceding modified-Grignard-based cell is then compared with one based on an all-inorganic magnesium aluminum chloride complex (MACC) electrolyte. The precursor MACC solution is conditioned using choronoamperometry, a method which is shown to be capable of quickly conditioning large quantities of electrolyte. Mg/O2 cells based on the MACC electrolyte exhibited higher discharge capacities than those based on the modified Grignard electrolyte. The discharge product of the former system was found to be an inhomogeneous mixture of MgCl2 and Mg(ClO4)2. However, rechargeability was limited. Electrochemical impedance spectroscopy measurements were used to identify that film formation on the Mg anode is main source of impedance in Mg/O2 cells. This research shows that the performance of Mg-based batteries is highly sensitive to the type of electrolyte used. For example, our results demonstrate that Mg electrolytes containing Tf2N– and BF4 – anions do not promote reversible Mg electrochemistry due to the lack of dissociation between the Mg2+ cation and the anions. Moreover, the different behavior of Mg/O2 cells based on either a modified Grignard or MACC electrolyte can be related to evolution of Mg/electrolyte interface in the presence of O2 and the electrolyte's conductivity. For future work, it would be useful to develop halogen-free electrolytes to produce discharge products free of halogens which are chemically stable in the presence of O2.
Benzer Tezler
- Nadir toprak element oksitlerinden ergimiş tuz elektrolizi yöntemiyle nadir toprak elementlerinin sentezi
Synthesis of rare earth elements from rare earth oxides by molten salt electrolysis
OSMAN CAN ÖZER
Yüksek Lisans
Türkçe
2023
Metalurji Mühendisliğiİstanbul Teknik ÜniversitesiMetalurji ve Malzeme Mühendisliği Ana Bilim Dalı
PROF. DR. SERVET İBRAHİM TİMUR
- Separation of lithium from brines
Tuzlu sulardan lityum ayrıştırılması
BARIŞ ERDOĞAN
Doktora
İngilizce
2015
Kimya MühendisliğiOrta Doğu Teknik ÜniversitesiKimya Mühendisliği Ana Bilim Dalı
PROF. DR. H. ONDER OZBELGE
DOÇ. DR. YUSUF ULUDAĞ
- Tuz Gölü'nden solvent ekstraksiyonuyla lityum eldesi
Solvent extraction of lithium from Tuz Lake
MERVE ÖZTÜRK
Yüksek Lisans
Türkçe
2021
Metalurji Mühendisliğiİstanbul Teknik ÜniversitesiMetalurji ve Malzeme Mühendisliği Ana Bilim Dalı
DOÇ. DR. MEHMET ŞEREF SÖNMEZ
- Toz metalurjisi imalat yöntemi ile alüminyum matrisli TiC takviyeli kompozit malzeme üretimi ve çekme mukavemeti testlerinin analizi
Production of aluminum matrix TiC reinforced composite material by powder metallurgy manufacturing method and analysis of tensile strength tests
HAKAN YILMAZ
Yüksek Lisans
Türkçe
2024
Makine MühendisliğiSakarya ÜniversitesiMakine Mühendisliği Ana Bilim Dalı
DOÇ. DR. AHMET ÇAĞATAY ÇİLİNGİR
- Lityum iyon pillerinde katot malzeme eldesi
Obtaining cathode material in lithium ion batteries
ROJBİN BULUTTEKİN
Yüksek Lisans
Türkçe
2021
KimyaMersin ÜniversitesiKimya Ana Bilim Dalı
PROF. DR. AHMET MURAT GİZİR
DOÇ. DR. MUHARREM KUNDURACI