• Title/Summary/Keyword: Li-La-Ti-O

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Electrochemical Properties of Cu Current Collector with Li0.5La0.5TiO3 or Si Thin Film as a Li Free Anode (Li0.5La0.5TiO3와 Si박막을 갖는 구리 집전체의 Li free 음극으로써의 전기화학적 특성)

  • Lee Jae-Jun;Kim Soo-Ho;Lee Jong-Min;Yoon Young-Soo
    • Journal of the Korean Electrochemical Society
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    • v.9 no.1
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    • pp.34-39
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    • 2006
  • Electrochemical properties of Cu foil current collector with a $Li_{0.5}La_{0.5}TiO_3$ Cu a Si thin film deposited by r.f sputtering as an anode for Li free battery were evaluated. The Cu foil current collectors were lied in and out of plasma during sputtering process. The X-ray diffraction results indicated that the as-deposited Si and $Li_{0.5}La_{0.5}TiO_3$ thin films in and out of plasma did not show any crystalline difference. The $Li_{0.5}La_{0.5}TiO_3$ film in plasma and Si film out of plasma showed better cyclability since crystalline $Li_{0.5}La_{0.5}TiO_3$ has much higher ionic conductivity and crystalline Si film is much sensitive far volume change during charge-discharge process. These results suggested that the deposition of amorphous Si on Cu foil current collector is much better for fabrication of Li free battery and it can be useful for the unique battery with a cycling number constraint of below 10.

Amorphous Lithium Lanthanum Titanate Solid Electrolyte Grown on LiCoO2 Cathode by Pulsed Laser Deposition for All-Solid-State Lithium Thin Film Microbattery (전고상 리튬 박막 전지 구현을 위해 펄스 레이저 증착법으로 LiCoO2 정극위에 성장시킨 비정질 (Li, La)TiO3고체 전해질의 특성)

  • 안준구;윤순길
    • Journal of the Korean Ceramic Society
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    • v.41 no.8
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    • pp.593-598
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    • 2004
  • To make the all-solid-state lithium thin film battery having less than 1 fm in thickness, LiCoO$_2$ thin films were deposited on Pt/TiO$_2$/SiO$_2$/Si substrate as a function of Li/Co mole ratio and the deposition temperature by Pulsed Laser Deposition (PLD). Especially, LiCoO$_2$ thin films deposited at 50$0^{\circ}C$ with target of Li/Co=1.2 mole ratio show an initial discharge capacity of 53 $\mu$Ah/cm$^2$-$\mu$m and capacity retention of 67.6%. The microstructural and electrochemical properies of (Li, La)TiO3 thin films grown on LiCoO$_2$Pt/TiO$_2$/SiO$_2$/Si structures by Pulsed Laser Deposition (PLD) were investigated at various deposition temperatures. The thin films grown at 10$0^{\circ}C$ show an initial discharge capacity of approximately 51 $\mu$Ah/cm$^2$-$\mu$m and moreover show excellent discharge capacity retention of 90% after 100 cycles. An amorphous (Li, La)TiO$_3$ solid electrolyte is possible for application to solid electrolyte for all-solid-state lithium thin film battery below 1 $\mu$m.

The Effect of Coating Thickness on the Electrochemical Properties of a Li-La-Ti-O-coated Li[Ni0.3Co0.4Mn0.3]O2 Cathode

  • Lee, Hye-Jin;Park, Yong-Joon
    • Bulletin of the Korean Chemical Society
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    • v.31 no.11
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    • pp.3233-3237
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    • 2010
  • A $Li[Ni_{0.3}Co_{0.4}Mn_{0.3}]O_2$ cathode was modified by coating with Li-La-Ti-O, and the effect of the coating thickness on their electrochemical properties was studied. The thickness of the coating on the surface of $Li[Ni_{0.3}Co_{0.4}Mn_{0.3}]O_2$ was increased by increasing the wt % of the coating material. The rate capability of the Li-La-Ti-O-coated electrode was superior to that of the pristine sample. 1- and 2-wt %-coated samples showed considerable improvement in capacity retention at high C rates. However, the rate capability of a 5-wt %-coated sample decreased. All the coated samples showed a high discharge capacity and slightly improved cyclic performance under a high cut-off voltage (4.8 V) condition. Results of a storage test confirmed that the Li-La-Ti-O coating layer was effective in suppressing the dissolution of the transition metals as it offered protection from the attack of the acidic electrolyte. In particular, the 2- and 5-wt %-coated samples showed a better protection effect than the 1-wt %-coated sample.

Lithium Ion Conductivity in $Li_{3x}La_{(2/3-x)}TiO_3$ system ($Li_{3x}La_{(2/3-x)}TiO_3$계의 리튬 이온전도특성)

  • 정훈택;정태석;김호기
    • Journal of the Korean Ceramic Society
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    • v.33 no.3
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    • pp.293-298
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    • 1996
  • Room temperature Li+ ion conductivities of Li3xLa(2/3-x)TiO3 system with x=0.117~0.317 were measured by complex impedance method. ICP, SEM and XRD analysis were conducted to study the main factor which influence the Li+ ion conductivity. Li+ ion conductivity seems to have a close relationship with the crystal structure of primitive cell increase as the primitive cell as close to cubic.

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The Effects of Li-La-Ti-O Coating on the Properties of Li[Ni0.3Co0.4Mn0.3]O2 Cathode Material (Li[Ni0.3Co0.4Mn0.3]O2 양극물질의 Li-La-Ti-O코팅 효과)

  • Lee, Hye-Jin;Yun, Su-Hyun;Park, Bo-Gun;Ryu, Jea-Hyeok;Kim, Kwan-Su;Kim, Seuk-Buom;Park, Yong-Joon
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.22 no.10
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    • pp.890-896
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    • 2009
  • Li(Ni, Co, Mn)$O_2$ has been known as one of the most promising cathode materials for lithium secondary batteries. However, it has some problems to overcome for commercialization such as inferior rate capability and unstable thermal stability. In order to address these problems, surface modification of cathode materials by coating has been investigated. In the coating techniques, selection of coating material is a key factor of obtaining enhanced properties of cathode materials. In this work, we introduced solid electrolyte (Li-La-Ti-O) as a coating material on the surface of $Li[Ni_{0.3}Co_{0.4}Mn_{0.3}]O_2$ cathode. Specially, we focused on a rate performance of Li-La-Ti-O coated $Li[Ni_{0.3}Co_{0.4}Mn_{0.3}]O_2$ cathode. Both bare and Li-La-Ti-O 2 wt.% coated sample showed similar discharge capacity at 0.5C rate. However, as the increase of charge-discharge rate to 3C, the coated samples displayed better discharge capacity and cyclic performance than those of bare sample.

The Electrochemical Properties of Li4/3Ti5/3O4 Synthesized by Sol-Gel Process (졸-겔법에 의해 합성된 Li4/3Ti5/3O4의 전기화학적 특성)

  • Lee, Jin-Sik;Lee, Chul-Tae
    • Applied Chemistry for Engineering
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    • v.10 no.1
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    • pp.73-79
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    • 1999
  • The superstructured $Li_{4/3}Ti_{5/3}O_4$ was prepared by sol-gel process using a mixed solution of lithium acetate (LA) and titanium n-butoxide (TNB). The gel phase was obtained by adding ammonia water ($NH_4OH/TNB$ mole ratio of 0.35) and water ($H_2O/TNH$ mole ratio of 3.5) into the clear sol that was prepared after mixing TNB/LA mole ratio of 5/4 with AA/TNB mole raio of 0.125. It was found that the most suitable $Li_{4/3}Ti_{5/3}O_4$ was obtained by heat treatment of xerogel at $600^{\circ}C$ for 30 hrs. The synthesized $Li_{4/3}Ti_{5/3}O_4$ showed an initial discharge capacity of 174 mAh/g and the capacity loss of about 27.3% during 25 cycles in Li/1M $LiClO_4(in\;PC)/Li_{4/3}Ti_{5/3}O_4$ at current density of $0.15mA/cm^2$ and the voltage range of 0.5~3.0 V.

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Lithium Lanthanum Titanate Solid Electrolyte for All-Solid-State Lithium Microbattery (전고상박막전지를 위한 (Li,La)TiO3 고체전해질의 제조와 특성)

  • 안준구;윤순길
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.9
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    • pp.930-935
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    • 2004
  • $({Li}_{0.5}0{La}_{0.5}){TiO}_3$ (LLTO) solid electrolyte was grown on LiCo{O}_2 (LCO) cathode films deposited on $Pt/Ti{O}-2/Si{O}_2/Si$ substrate using pulsed laser deposition for all-solid-state lithium microbattery. LLTO solid electrolyte exhibits an amorphous phase at various deposition temperatures. LLTO films deposited at 10$0^{\circ}C$ showed a clear interrace without any chemical reaction with LCO, and showed an initial discharge capacity of 50 $\mu$Ah/cm$^2$-$\mu$m and capacity retention of 90 % after 100 cycles with Li anode in 1mol$ LiCl{O}_4$ in propylene carbonate (PC). The increase of capacity retention in LLTO/LCO structure than LCO itself was attributed to the structural stability of LCO cathode films by the stacked LLTO. The cells of LLTO/LCO with LLTO grown at $100^{\circ}C$ showed a good cyclic property of 63.6 % after 300 cycles. An amorphous LLTO solid electrolyte is possible for application to solid electrolyte for all-solid-state lithium microbattery.

Pyroelectric Infrared Sensors using (Pb,La)TiO3/LiTaO3/(Pb,La)TiO3 Multilayer Ferroelectric Thin Films ((Pb,La)TiO3/LiTaO3/(Pb,La)TiO3 다층 강유전 박막을 이용한 초전형 적외선 센서)

  • Sung, Se-Kyoung;Lee, Du-Hyun;Choi, Hyek-Hwan;Lee, Myoung-Kyo;Kwon, Tae-Ha
    • Journal of Sensor Science and Technology
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    • v.11 no.4
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    • pp.247-253
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    • 2002
  • For fabrication of the pyroelectric IR sensor $(Pb,La)TiO_3(PLT)$/$LiTaO_3$/(LTO)/PLT ferroelectric thin films was deposited by rf magnetron sputtering followed by rapid thermal annealing and the crystallinity as a function of annealing temperature and time was investigated. Permittivity and dielectric loss factor of ferroelectric thin films as a function of c-axis preffered orientation was measured. Also pyroelectric coefficient of ferroelectric thin films with largest c-axis preffered orientation was measured and obtain figure of merit of voltage response($F_V$) and detectivity($F_D$). In this case $F_V$, $F_D$ was $5.63{\times}10^{-10}\;C{\cdot}cm/J$, $1.98{\times}10^{-8}\;C{\cdot}cm/J$, respectively.