Investigation of nickel oxide and germanium for Li-ion battery anodes
We aimed to develop high performance anodes for Li-ion batteries. Three approaches were investigated to minimize the aggregation, pulverization and delamination problems. Firstly, graphitic and amorphous carbon was incorporated to directly-grown NiO nanostructures. NiO-C showed better electrochemica...
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2015
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/62246 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | We aimed to develop high performance anodes for Li-ion batteries. Three approaches were investigated to minimize the aggregation, pulverization and delamination problems. Firstly, graphitic and amorphous carbon was incorporated to directly-grown NiO nanostructures. NiO-C
showed better electrochemical performances than pristine-NiO due to high electrical conductance and better mechanical flexibility of graphitic and/or amorphous carbon.
Secondly, vertically-aligned MWCNT arrays were used as base structures for sputtered-NiO, amorphous-Ge and polycrystalline-Ge. The
electrochemical performances of MWCNT/NiO were significantly improved than pristine-NiO since vertically-aligned MWCNTs enhanced the ionic and
electronic transports and absorbed the stresses during lithiation/delithiation.
MWCNT/a-Ge showed higher specific capacity than MWCNT/c-Ge as MWCNT/a-Ge skipped electrochemically-driven solid-state amorphization
during first lithiation. MWCNT/a-Ge benefited from low cost processing and low anodic scan peak. Thirdly, annealing treatment was investigated. Annealed-Ge had
significantly improved electrochemical performances than as-deposited Ge
due to better SS/Ge-film adhesion due to inter-diffusion at SS/Ge interface. |
|---|