DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Pyun, Su-Il | - |
dc.contributor.advisor | 변수일 | - |
dc.contributor.author | Kim, Sung-Woo | - |
dc.contributor.author | 김성우 | - |
dc.date.accessioned | 2011-12-15T01:31:07Z | - |
dc.date.available | 2011-12-15T01:31:07Z | - |
dc.date.issued | 1998 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=133538&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/50668 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 재료공학과, 1998.2, [ vii, 64 p. ] | - |
dc.description.abstract | The present work is concerned with electrochemical lithium intercalation into and deintercalation from porous $Li_{1+δ}[Ti_{2-y}Li_y]O_4$ (y=0; 1/3) electrodes in the two-phase coexistence. For this purpose, the galvanostatic charge-discharge curves were obtained from both the porous $Li_{1+δ}[Ti_5/3Li_1/3]O_4$ electrode and $Li_{1+δ}Ti_2O_4$ electrode and the electrochemical impedance spectra were measured on the former electrode as a function of lithium content ($1+δ$). And the potentiostatic current transients were measured on the both electrodes as a function of the lithium injection potential during the lithium intercalation and deintercalation. The galvanostatic charge-discharge curves for the both electrodes showed a potential plateau, due to the coexistence of two pseudo-phases of a Li-diluted phase α and a Li-concentrated phase β. The potential plateau of the porous $Li_{1+δ}[Ti_5/3Li_1/3]O_4$ electrode was higher in value than that of the porous $Li_{1+δ}Ti_2O_4$ electrode. This is attributable to the transition 3.5 to 4 in average oxidation state of titanium in the electrode with change y = 0 to y = 1/3. The formation of β-phase in the porous $Li_{1+δ}[Ti_5/3Li_1/3] O_4$ electrode is more liable to occur in comparison with that in the porous $Li_{1+δ}Ti_2O_4$ electrode during the lithium intercalation, because of the stronger mutual attraction between the adjacent lithium ions in the former electrode than that in the latter electrode. Thus, the charge-discharge curves showed that the stable α-phase region of the former electrode appeared narrower than that of the latter electrode. The impedance spectra of porous $Li_{1+δ}[Ti_5/3Li_1/3]O_4$ electrode consist of two separated arcs in the high and intermediate frequency ranges and an inclined line in the low frequency range. In view of the fact that the high frequency arc representing the particle-to-particle contact resistance and capacitance was constant regardless of lithium content, it is expected t... | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | Lithium intercalation | - |
dc.subject | Lithium titanium oxide | - |
dc.subject | Lithium transport | - |
dc.subject | Lithium ion battery | - |
dc.subject | Current transient technique | - |
dc.subject | 전류 변화법 | - |
dc.subject | 리튬인터칼레이션 | - |
dc.subject | 리튬타이타늄산화물 | - |
dc.subject | 리튬이동현상 | - |
dc.subject | 리튬이온전지 | - |
dc.title | (An) investigation of electrochemical lithium intercalation into and deintercalation from porous $Li_{1+δ}[Ti_{2-y}Li_y]O_4$ (y=0; 1/3) electrodes by using current transient technique | - |
dc.title.alternative | Current transient 방법을 이용한 다공성 $Li_{1+δ}[Ti_{2-y}Li_y]O_4$ (y=0; 1/3) 전극에서의 전기화학적 리튬 Intercalation과 Deintercalation에 대한 연구 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 133538/325007 | - |
dc.description.department | 한국과학기술원 : 재료공학과, | - |
dc.identifier.uid | 000963104 | - |
dc.contributor.localauthor | Pyun, Su-Il | - |
dc.contributor.localauthor | 변수일 | - |
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