• Title/Summary/Keyword: LiCoO2

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Crystallization and Electrochemical properties of $Li_{2}O=P_{2}O_{5}=V_{2}O_{5}$ Glasses ($Li_{2}O=P_{2}O_{5}=V_{2}O_{5}$ 유리의 결정화에 따른 전기 화학적 특성변화)

  • 손명모;이헌수;구할본;김상기
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.523-527
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    • 2000

  • Vanadate glasses in the Li$_2$O-P$_2$O$_{5}$-V$_2$O$_{5}$ system containing 10mo1% glass former, P$_2$O$_{5}$ were prepared by melting the batch in pt. crucib1e followed by quenching on the copper plate. We found that Li$_2$O-P$_2$O$_{5}$-V$_2$O$_{5}$ glass-ceramics obtained from nucleation of glass showed significantly higher capacity and longer cycle life than conventionally made crystalline LiCoO$_2$, LiNiO$_2$and LiV$_3$O$_{8}$. In the present paper, We describe electro-chemical properties during crystallization process and find the best crystallization condition of Li$_2$O-P$_2$O$_{5}$-V$_2$O$_{5}$ g1ass as cathod material. Li$_2$O-P$_2$O$_{5}$-V$_2$O$_{5}$ glass-ceramics shows superior rechargeable capacity of 220 mAh/g in the cycling between 2.0 and 3.9V.etween 2.0 and 3.9V.

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Optical Properties of Stoichiometric Tb/Mn Co-doped LiNbO3 Single Crystals Dependent on Mn Concentration (Mn 첨가량 변화에 따른 Tb/Mn이 첨가된 화학양론조성 LiNbO3 단결정의 광학적 특성)

  • Lee, Sung-Mun;Shin, Tong-Ik;Kim, Geun-Young;Back, Seung-Wook;Yoon, Dae-Ho
    • Journal of the Korean Ceramic Society
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    • v.41 no.1
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    • pp.92-95
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    • 2004

  • Using the Micro-Pulling Down (${\mu}$-PD), $MnO_2$ and $Tb_4O_7$ co-doped crack-free stoichiometric $LiNbO_3$ single crystals were grown in 1.0 mm diameter and 25-30 mm length for c-axis. The homogeneous distributions of $MnO_2$ and $Tb_4O_7$ concentration were confirmed by the Electron Probe Microanalysis (EPMA). Also, the infrared OH absorption band of the single crystals observed by using a Fourier Transform-Infrared Spectrophotometer (FT-IR) at room temperature and the photoluminescence spectra was measured with respect to the $MnO_2$ and $Tb_4O_7$ doping.

  • https://doi.org/10.4191/KCERS.2004.41.1.092 인용 PDF KSCI

A study on the sintering condition and Electric properties of BST thick film (BST Tunable 후막 유전체의 소결과 유전 특성엘 관한 연구)

  • Kim, I.S.;Min, B.K.;Song, J.S.;Jeon, S.Y.
    • Proceedings of the KIEE Conference
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    • 2005.07c
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    • pp.2013-2015
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    • 2005

  • In this paper, Effect of $BaSrTiO_3/Li_2CO_3$ on low temperature sintering and dielectric property of thick films has been investigated for variable capacitor on high frequency. The thick films were fabricated by the tape casting and then the structural and dielectric properties as a function of an addition composition ratio and sintering temperature were studied. For the thick film sintered at $1050^{\circ}C$, it was densified to 96% of $BaSrTiO_3$ theoretical density by the addition of 10 $wt{\cdot}%$ $BaSrTiO_3/Li_2CO_3$. Dielectric constant increased and Curie temperature lowered with the increased of $BaSrTiO_3/Li_2CO_3$ content, which probably can be explained by the substitution of $Ba^{3+},Li^{1+}$ on $RaTiO_3$ lattice. The tunability and dielectric loss of the $BaSrTiO_3/Li_2CO_3$ thick film, sintered at $1350^{\circ}C$, were about 26% and 0.234 at $10{\sim}15MHz$, respectively.

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