Dependence of Al2O3 coating thickness and annealing conditions on microstructural and electrochemical properties of LiCoO 2 film

Sun Gyu Park; Seong Rae Lee; Won Il Cho; Byung Won Cho

doi:10.1007/s12540-010-0093-9

Dependence of Al₂O₃ coating thickness and annealing conditions on microstructural and electrochemical properties of LiCoO ₂ film

Sun Gyu Park, Seong Rae Lee, Won Il Cho, Byung Won Cho

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Porous Y-doped (Ba,Sr)TiO₃ ceramics were prepared by the spark plasma sintering of (Ba,Sr)TiO₃ powders with different amounts of carbon black, and by subsequently burning out the carbon black acting as a pore precursor. The microstructure, PTCR and gas-sensing characteristics for porous Y-doped (Ba,Sr)TiO₃ ceramics were investigated. Spark plasma sintered (Ba,Sr)TiO₃ ceramics revealed a very fine microstructure containing submicron-sized grains with a cubic phase and revealed an increased porosity after the carbon black was burned out. As a result of reoxidation treatment, the grain size of the (Ba,Sr)TiO₃ ceramics increased to a few and mu;m and the cubic phase transformed into a tetragonal phase. The phase transformation of (Ba,Sr)TiO₃ ceramics was affected by grain size. The PTCR jump in the (Ba,Sr)TiO₃ ceramics prepared by adding 40 vol.% carbon black showed an excellent value of 4.72 and times; 10 6 , which was ten times higher than the PTCR jump in (Ba,Sr)TiO₃ ceramics. The electrical resistivity of the porous (Ba,Sr)TiO₃ ceramics was recovered as the atmosphere changed from a reducing gas (N₂) to an oxidizing gas (O2) under consecutive heating and cooling cycles.

Original language	English
Pages (from-to)	93-98
Number of pages	6
Journal	Metals and Materials International
Volume	16
Issue number	1
DOIs	https://doi.org/10.1007/s12540-010-0093-9
Publication status	Published - 2010 Feb

Bibliographical note

Funding Information:
This work was financially supported by the program Development of Basic Technology for Next Generation Li-Composite Secondary Batteries of KIST.

Keywords

Electrical properties
Grain boundary
Grain growth
Microstructure
Sintering

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys
Materials Chemistry

Access to Document

10.1007/s12540-010-0093-9

Cite this

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title = "Dependence of Al2O3 coating thickness and annealing conditions on microstructural and electrochemical properties of LiCoO 2 film",

abstract = "Porous Y-doped (Ba,Sr)TiO3 ceramics were prepared by the spark plasma sintering of (Ba,Sr)TiO3 powders with different amounts of carbon black, and by subsequently burning out the carbon black acting as a pore precursor. The microstructure, PTCR and gas-sensing characteristics for porous Y-doped (Ba,Sr)TiO3 ceramics were investigated. Spark plasma sintered (Ba,Sr)TiO3 ceramics revealed a very fine microstructure containing submicron-sized grains with a cubic phase and revealed an increased porosity after the carbon black was burned out. As a result of reoxidation treatment, the grain size of the (Ba,Sr)TiO3 ceramics increased to a few and mu;m and the cubic phase transformed into a tetragonal phase. The phase transformation of (Ba,Sr)TiO3 ceramics was affected by grain size. The PTCR jump in the (Ba,Sr)TiO3 ceramics prepared by adding 40 vol.% carbon black showed an excellent value of 4.72 and times; 10 6 , which was ten times higher than the PTCR jump in (Ba,Sr)TiO3 ceramics. The electrical resistivity of the porous (Ba,Sr)TiO3 ceramics was recovered as the atmosphere changed from a reducing gas (N2) to an oxidizing gas (O2) under consecutive heating and cooling cycles.",

keywords = "Electrical properties, Grain boundary, Grain growth, Microstructure, Sintering",

author = "Park, {Sun Gyu} and Lee, {Seong Rae} and Cho, {Won Il} and Cho, {Byung Won}",

note = "Funding Information: This work was financially supported by the program Development of Basic Technology for Next Generation Li-Composite Secondary Batteries of KIST.",

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AU - Park, Sun Gyu

AU - Lee, Seong Rae

AU - Cho, Won Il

AU - Cho, Byung Won

N1 - Funding Information: This work was financially supported by the program Development of Basic Technology for Next Generation Li-Composite Secondary Batteries of KIST.

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N2 - Porous Y-doped (Ba,Sr)TiO3 ceramics were prepared by the spark plasma sintering of (Ba,Sr)TiO3 powders with different amounts of carbon black, and by subsequently burning out the carbon black acting as a pore precursor. The microstructure, PTCR and gas-sensing characteristics for porous Y-doped (Ba,Sr)TiO3 ceramics were investigated. Spark plasma sintered (Ba,Sr)TiO3 ceramics revealed a very fine microstructure containing submicron-sized grains with a cubic phase and revealed an increased porosity after the carbon black was burned out. As a result of reoxidation treatment, the grain size of the (Ba,Sr)TiO3 ceramics increased to a few and mu;m and the cubic phase transformed into a tetragonal phase. The phase transformation of (Ba,Sr)TiO3 ceramics was affected by grain size. The PTCR jump in the (Ba,Sr)TiO3 ceramics prepared by adding 40 vol.% carbon black showed an excellent value of 4.72 and times; 10 6 , which was ten times higher than the PTCR jump in (Ba,Sr)TiO3 ceramics. The electrical resistivity of the porous (Ba,Sr)TiO3 ceramics was recovered as the atmosphere changed from a reducing gas (N2) to an oxidizing gas (O2) under consecutive heating and cooling cycles.

AB - Porous Y-doped (Ba,Sr)TiO3 ceramics were prepared by the spark plasma sintering of (Ba,Sr)TiO3 powders with different amounts of carbon black, and by subsequently burning out the carbon black acting as a pore precursor. The microstructure, PTCR and gas-sensing characteristics for porous Y-doped (Ba,Sr)TiO3 ceramics were investigated. Spark plasma sintered (Ba,Sr)TiO3 ceramics revealed a very fine microstructure containing submicron-sized grains with a cubic phase and revealed an increased porosity after the carbon black was burned out. As a result of reoxidation treatment, the grain size of the (Ba,Sr)TiO3 ceramics increased to a few and mu;m and the cubic phase transformed into a tetragonal phase. The phase transformation of (Ba,Sr)TiO3 ceramics was affected by grain size. The PTCR jump in the (Ba,Sr)TiO3 ceramics prepared by adding 40 vol.% carbon black showed an excellent value of 4.72 and times; 10 6 , which was ten times higher than the PTCR jump in (Ba,Sr)TiO3 ceramics. The electrical resistivity of the porous (Ba,Sr)TiO3 ceramics was recovered as the atmosphere changed from a reducing gas (N2) to an oxidizing gas (O2) under consecutive heating and cooling cycles.

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KW - Grain boundary

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KW - Microstructure

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