Browsing by Subject "Lithium ion batteries"
Now showing items 1-10 of 10
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EXTENDED LIFETIME AND INCREASED ENERGY DENSITY STUDIES FOR LI-ION CELLS
(2021-08-27)Strategies to improve Li-ion cells involve decreasing cost, increasing lifetime, increasing energy density, and increasing safety. This thesis presents work from two studies aimed at extending cell lifetime and improving ... -
Lithium-Rich Transition Metal Oxides as Positive Electrode Materials in Lithium-Ion Batteries
(2010-11-19)Lithium-rich transition metal oxides are candidates for the next-generation lithium-ion battery positive electrode materials. They have a much higher first charge and low-rate cycling capacity compared to non-lithium rich ... -
Structure, Magnetic Ordering and Electrochemistry of Li1+xV1-xO2
(2011-04-08)The layered transition metal oxide composition series of Li1+xV1-xO2 was synthesized using the solid state synthesis technique. X-ray diffraction was used to determine the dependence of structure on composition and clearly ... -
STUDY AND DEVELOPMENT OF LAYERED LI-NI-MN-CO OXIDE POSITIVE ELECTRODE MATERIALS FOR LITHIUM ION BATTERIES
(2016-08-15)Layered Li-Ni-Mn-Co oxides (NMC) with low cobalt content are promising positive electrode materials for Li-ion batteries. However, the detailed structural properties of these materials are still debated. This thesis work, ... -
STUDYING LONG TERM LI-ION ELECTROLYTE DEGREDATION USING LITHIUM ION DIFFERENTIAL THERMAL ANALYSIS
(2018-09-04)Lithium ion cells contain liquid electrolytes that degrade over the lifetime of the cell. Though the results of this degradation are well understood, the pathways are not. Lithium ion differential thermal analysis (Li-ion ... -
Studying the Diffusion of Al3+ ions from Atomic Layer Deposited Al2O3 Surface Coatings into Positive Electrode Materials and the Effects Thereof Using Full Coin Cells
(2021-05-05)Increasing the energy density of lithium-ion batteries (LIBs) is an important goal for battery research for electric vehicle and grid storage applications. One method of doing this is to use a protective coating on the ... -
SURPRISING CHEMISTRY IN LI-ION CELLS
(2017-08-17)High voltage LiNixMnyCo(1-x-y)O2 (NMC) cells with conventional ethylene carbonate-based electrolytes do not have good charge-discharge capacity retention above 4.3 V. It is therefore important to investigate the failure ... -
Synthesis and Characterization of Co-free Ni-rich Single Crystalline Positive Electrode Materials for Li-ion Batteries
(2021-08-24)To lower the cost and increase the energy density of Li-ion batteries, a common approach is to use positive active electrode materials that are higher in Ni and lower in Co than currently used. However, a set of challenges ... -
Synthesis and Characterization of Magnesium and Manganese Doped LiCoO2
(2017-07-17)LiCo1-2xMgxMnxO2 (0 ≤ x ≤ 0.05) positive electrode materials were prepared from Co1-2xMgxMnx(OH)2 (0 ≤ x ≤ 0.05) co-precipitated precursor materials by mixing precursor materials with Li2CO3 and heating. All precursor and ...