Abstract
In order to satisfy the energy demands of the electromobility market, further improvements in cathode materials are receiving much attention, aiming high energy density cathode materials for Li-ion batteries (LIBs) application. In this work, the self-propagating combustion (SPC) method is used to synthesise undoped LiNi0.6Co0.3Ti0.1O2 (LNCT), novel nano-size Al-doped into cobalt site of LiNi0.6Co0.3-xAlxTi0.1O2 (x=0.01, 0.02, 0.03, 0.04, 0.05 denoted as LCA1, LCA2, LCA3, LCA4, LCA5 respectively) and novel nano-size Al-doped into nickel site of LiNi0.6-xCo0.3AlxTi0.1O2 (x=0.01, 0.02, 0.03, 0.04, 0.05 denoted as LNA1, LNA2, LNA3, LNA4, LNA5 respectively) cathode materials. LNCT and Al-doped materials are annealed at 700 ℃ for 24 h. Following the synthesis, the phase, chemical structure and purity of the materials are analysed using X-Ray Diffraction (XRD). Based on the XRD results, all materials demonstrate a single-phase structure with a rhombohedral layered structure. Based on the FESEM and EDX results, all samples exhibit polyhedral like shape, while the Al-doped samples display smaller crystallite size compare to the undoped sample. As for the electrochemical performances, the initial discharged capacities of all stoichiometry of Al-doped materials are higher than LNCT. Al-doped into cobalt site with x=0.01 (LCA1) gives the best initial discharge capacity of 238.6 mAhg-1 meanwhile the best initial discharge capacity for Al-doped into nickel site is at x=0.01 (LNA1) with a capacity of 214.7 mAhg-1. Even though LCA1 owns higher initial capacity than LNA1, LNA1 has lower capacity fading after the fiftieth cycle compared to LCA1 sample which makes it a more excellent candidate in electrochemical performance. The main reason for the excellent electrochemical behaviour of LNA1 is due to lower cation mixing. Furthermore, Rietveld refinements reveal that LNA1 sample has a longer atomic distance of Li-O and shorter TM-O in the cathode structure which makes Li+ ion diffusion more efficient which then leads to excellent electrochemical performance. These findings further proved the potential of the novel nano cathode material of LiNi0.6-xCo0.3AlxTi0.1O2 (LNA1) to replace the existing commercialized cathode materials for rechargeable Li-ion batteries.
Metadata
Item Type: | Thesis (Masters) |
---|---|
Creators: | Creators Email / ID Num. Wan Azizan, Wan Aida Hazwani 2017827956 |
Contributors: | Contribution Name Email / ID Num. Thesis advisor Kasim, Muhd Firdaus (Dr.) UNSPECIFIED |
Subjects: | Q Science > QD Chemistry > Analytical chemistry T Technology > TK Electrical engineering. Electronics. Nuclear engineering > Production of electricity by direct energy conversion T Technology > TK Electrical engineering. Electronics. Nuclear engineering > Production of electricity by direct energy conversion > Lithium cells |
Divisions: | Universiti Teknologi MARA, Shah Alam > Faculty of Applied Sciences |
Programme: | Master of Science (Applied Chemistry) |
Keywords: | Lithium nickel oxide; cathode; synthesis method |
Date: | September 2021 |
URI: | https://ir.uitm.edu.my/id/eprint/60208 |
Download
![[thumbnail of 60208.pdf]](https://ir.uitm.edu.my/style/images/fileicons/text.png)
60208.pdf
Download (251kB)
Digital Copy
![](/images/terminal.jpg)
Physical Copy
ID Number
60208
Indexing
![](https://library.uitm.edu.my/images/2020/01/23/googlescholar-01.png)
![](https://www.base-search.net/interface/images/base_logo_kl.png)