DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Kang, Ki-Suk | - |
dc.contributor.advisor | 강기석 | - |
dc.contributor.author | Kim, Jong-Soon | - |
dc.contributor.author | 김종순 | - |
dc.date.accessioned | 2011-12-15T01:42:18Z | - |
dc.date.available | 2011-12-15T01:42:18Z | - |
dc.date.issued | 2010 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=419230&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/51355 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 신소재공학과, 2010.2, [ ix, 78 p ] | - |
dc.description.abstract | In this study, the solid solution of spinel $(2/3)Li(Li_{1/3}Ti_{5/3})O_4 - (1/3)Li(Ni_{1/2}Ti_{3/2})O_4$ as an anode material and the olivine $Li(FeCo)_{0.05}Mn_{0.9}PO_4$ as a cathode material were investigated for the improved properties of lithium secondary batteries. In the anode material, the structural/electrochemical properties of solid solution of spinel $(2/3)Li(Li_{1/3}Ti_{5/3})O_4 - (1/3)Li(Ni_{1/2}Ti_{3/2})O_4$ were compared with $Li(Li_{1/3}Ti_{5/3})O_4$ to identify the effect of doping to the structural invariance of $(2/3)Li(Li_{1/3}Ti_{5/3})O_4$. The solid solution retained the zero strain characteristic of $(Li(Li_{1/3}Ti_{5/3})O_4$ during discharge/charge with an excellent cycle stability, while the rate capability was notably improved. However, a reversible broadening of the XRD peak was observed at the end of discharge, indicating some structural changes. XAS measurements showed that the oxidation state of Ti was +4 and that of Ni was +2 in the solid solution. In the cathode material, the structural/electrochemical properties of olivine $Li(FeCo)_{0.05}Mn_{0.9}PO_4$ were compared with $Li(FeCo)_{0.05}Mn_{0.9}PO_4$ and $LiMnPO_4$ to identify the effect of small amounts of co-doping of Fe and Co. The rate capability of $Li(FeCo)_{0.05}Mn_{0.9}PO_4$ was notably improved. Easier and more frequent nucleation by Fe and Co in Mn-based olivines significantly enhanced the rate capability as evidenced by the electrochemical results. | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | spinel | - |
dc.subject | LiMnPO4 | - |
dc.subject | Li(Li1/3Ti5/3)O4 | - |
dc.subject | lithium rechargeable batteries | - |
dc.subject | olivine | - |
dc.subject | 올리빈 | - |
dc.subject | 스피넬 | - |
dc.subject | 리튬망간니스옥사이드 | - |
dc.subject | 리튬타이타늄옥사이드 | - |
dc.subject | 리튬이차전지 | - |
dc.title | Electrode material designs for lithium rechargeable batteries | - |
dc.title.alternative | 리튬이차전지 전극소재 설계에 관한 연구 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 419230/325007 | - |
dc.description.department | 한국과학기술원 : 신소재공학과, | - |
dc.identifier.uid | 020083135 | - |
dc.contributor.localauthor | Kang, Ki-Suk | - |
dc.contributor.localauthor | 강기석 | - |
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