Thesis
Investigating molybdenum dioxide as anode material in lithium ion batteries
Washington State University
Master of Science (MS), Washington State University
2014
Handle:
https://hdl.handle.net/2376/102390
Abstract
Research conducted on metal oxides such molybdenum dioxide, has shown that the material exhibits a higher capacity than commercially used graphite and has great potential to be considered as alternative anode material for Li-ion batteries. In this study we investigate the impact that morphology of nano-structured molybdenum dioxide has on the electrochemical performance of the Li-ion battery. Three samples namely Sample 1, 2 and 3 were synthesized using hydrothermal method, with an increase in crystallinity from Sample 1 to 3. Electrospraying deposition was then utilized to form a thin film of the as synthesized MoO2 powders on a Ni substrate, which was utilized as negative electrodes in Li-ion batteries. The materials were investigated as negative electrodes in Li-ion batteries at a voltage range of 0.05-3 V (vs. Li/Li+ ) and a fixed current density of 100 mA g-1 . The electrochemical results show that the lattice structure of MoO2 has great impact on the performance of the anode material at room temperature. Sample 1, which had the lowest crystallinity and smallest particle size, had the most stable electrochemical performance when compared to Samples 2 and 3 with higher crystallinity and particle sizes. In a separate study it was observed that addition of a carbon component contributes to the improved cycling stability of the MoO2 anode material by hindering MoO2 particles from aggregating during electrochemical testing. Carbon also increases the electronic conductivity of MoO2 resulting in a higher capacity and improved electrochemical performance of the Li-ion battery as a whole. Proper morphology, structure and particle size are necessary for MoO2 to be employed as an anode material in Li-ion batteries, because the anode material undergoes a multitude of aging mechanisms in it's crystallinity and morphology during the electrochemical testing.
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Details
- Title
- Investigating molybdenum dioxide as anode material in lithium ion batteries
- Creators
- Samukelisiwe Mkhize
- Contributors
- Su Ha (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Chemical Engineering and Bioengineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525019201842
- Language
- English
- Resource Type
- Thesis