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TiO2 코팅을 통한 Li[Ni0.82Co0.14Al0.04]O2 양극 활물질의 고전압 특성에 관한 연구

Title
TiO2 코팅을 통한 Li[Ni0.82Co0.14Al0.04]O2 양극 활물질의 고전압 특성에 관한 연구
Other Titles
Enhancement of high voltage performance of Li[Ni0.82Co0.14Al0.04]O2 materials with TiO2 coating
Author
김종현
Alternative Author(s)
Kim, Jong Hyun
Advisor(s)
선양국
Issue Date
2018-02
Publisher
한양대학교
Degree
Master
Abstract
Titanium dioxide (TiO2) coated layered Li[Ni0.82Co0.14Al0.04]O2 materials are synthesized using a facile dry coating route. The structural and electrochemical properties of pristine and TiO2 coated electrodes are analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), galvanostatic charge/discharge tests, electrochemical impedance spectra (EIS), differential capacity (dQ/dV) and differential scanning calorimetry (DSC). The results indicate that the Li[Ni0.82Co0.14Al0.04]O2 particles are partially covered with a TiO2 layer (about 30 nm thick) after 1 wt.% TiO2 surface modification. The coated electrode shows the enhanced initial coulombic efficiency of 94.3% compared to 90.7% for the uncoated electrode. Moreover, the coated electrode exhibits higher capacity retentions, which exhibits capacity retention of 84.5% after 100 cycles compared with 74.6% for the pristine one. Furthermore, the TiO2 coated electrode delivers a superior high rate capacity of 169.3 mAh/g at 5C rate, higher than 146.0 mAh/g for the uncoated electrode. The remarkably improved cycling stability and high rate capacity of the TiO2 coated electrode comes from the presence of a stable and thin TiO2 coating layer which effectively reduces the damage of electrode structure and suppresses the increase of impedance during cycling by preventing direct contact of electrode and electrolyte.
URI
http://www.dcollection.net/handler/hanyang/000000105220http://repository.hanyang.ac.kr/handle/20.500.11754/68285
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > ENERGY ENGINEERING(에너지공학과) > Theses (Master)
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