Electrochemical properties of sol-gel processed $LiMn_2O_4$ thin films for microbattery졸-겔법을 이용한microbattery용 $LiMn_2O_4$ 박막의 전기화학적 특성

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$LiMn_2O_4$ thin films have received considerable attention as cathode materials for thin film microbattery. In this work, the $LiMn_2O_4$ thin films are prepared by a sol-gel method using a spin coator. Unhydrous Mn($CH_3COCHCOCH_3)_3$(manganese acetylacetonate) and $LiCH_3COCHCO-CH_3$(Lithium acetylacetonate) are chosen as the source materials. The precursor powder is investigated by TG-DTA and Mass spectroscopy analysis in order to study the decomposition process prior to deposition. The coated films are dried at 230-380℃, and annealed at 700-800℃ to obtain a spinel structure. The films annealed under appropriate conditions exhibit good crystallinity, smooth surface morphology, high capacity and good rechargeability. The electrochemical properties of films depend on the drying temperature even when subjected to the same annealing conditions. The discharge capacity of the annealed films increases as the drying temperature is increased. In the discharge curves of the annealed films dried at lower temperature, two less distinct voltage plateaus are observed. These films also show oxygen deficiency. From these results, it can be inferred that the annealed films dried at lower temperature have more structural defects, which may be associated with oxygen deficiency. As the drying temperature increases, the perfection of spinel framework is increased due to decrease of the structural defects, which may cause the increase of discharge capacity per volume. The annealed films dried at lower temperature show better rechargeability than those dried at higher temperature. The good rechargeability observed for the annealed films dried at lower temperature may be associated with ````imperfection```` of the spinel structure, which can relieve the mechanical stress generated during cycling. Controlling the fabrication condition, we can observe the excellent cycling behavior in the $LiMn_2O_4$ thin film electrode. Some research groups also have reported excellent rechargeabil...
Advisors
Kim, Ho-Giresearcher김호기researcher
Description
한국과학기술원 : 재료공학과,
Publisher
한국과학기술원
Issue Date
2000
Identifier
157706/325007 / 000965157
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 재료공학과, 2000.2, [ x, 140 p. ]

Keywords

Sol-gel; Thin film; Microbattery; Tin oxide; 리튬망간산화물; 주석산화물; 졸-겔; 박막전지; 마이크로배터리

URI
http://hdl.handle.net/10203/50384
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=157706&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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