<p>Lithium ion batteries have been regarded as one of the most promising and intriguing
energy storage devices in modern society since 1990s. A lithium ion battery
contains three main components, cathode, anode, and electrolyte, and the
performance of battery depends on each component and the compatibility between
them. Electrolyte acts as a lithium ions conduction medium and two electrodes
contribute mainly to the electrochemical performance. Generally, cathode is the
limiting factor in terms of capacity and cell potential, which attracts significant
research interests in this field.Different
from conventional slurry thick film cathodes with additional electrochemically
inactive additives, binder-free thin film cathode has become a promising
candidate for advanced high-performance lithium ion batteries towards applications
such as all-solid-state battery, portable electronics, and microelectronics.
However, these electrodes generally require modifications to improve the
performance due to intrinsically slow kinetics of cathode materials. </p>
<p>In
this thesis work, pulsed laser deposition has been applied to design thin film
cathode electrodes with advanced nanostructures and improved electrochemical
performance. Both single-phase nanostructure designs and multi-phase
nanocomposite designs are explored. In terms of materials, the thesis focuses
on manganese based layered oxides because of their high electrochemical performance.
In Chapter 3 of the nanocomposite cathode work, well dispersed Au nanoparticles were introduced into highly
textured LiNi<sub>0.5</sub>Mn<sub>0.3</sub>Co<sub>0.2</sub>O<sub>2 </sub>(NMC532)
matrix to act as localized current collectors and decrease the charge transfer resistance.
To further develop this design, in Chapter 4, tilted Au pillars were incorporated
into Li<sub>2</sub>MnO<sub>3</sub> with more effective conductive Au
distribution using simple one-step oblique angle pulsed laser deposition. In
Chapter 5, the same methodology was also applied to grow 3D Li<sub>2</sub>MnO<sub>3</sub>
with tilted and isolated columnar morphology, which largely increase the lithium
ion intercalation and the resulted rate capability. Finally, in Chapter 6, direct
cathode integration of NMC532 was attempted on glass substrates for potential
industrial applications. </p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/11309303 |
| Date | 14 January 2021 |
| Creators | Zhimin Qi (8070293) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/thesis/MANGANESE-BASED_THIN_FILM_CATHODES_FOR_ADVANCED_LITHIUM_ION_BATTERY/11309303 |
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