• Title/Summary/Keyword: Solid electrolyte film

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Fabrication of Li2MnSiO4 Cathode Thin Films by RF Sputtering for Thin Film Li-ion Secondary Batteries and Their Electrochemical Properties (RF 스퍼터법을 이용한 Li2MnSiO4 리튬 이차전지 양극활물질 박막 제조 및 전기화학적 특성)

  • Chae, Suman;Shim, Joongpyo;Sun, Ho-Jung
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.30 no.7
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    • pp.447-453
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    • 2017
  • In this study, $Li_2MnSiO_4$ cathode material and LiPON solid electrolyte were manufactured into thin films, and the possibility of their use in thin-film batteries was researched. When the RTP treatment was performed after $Li_2MnSiO_4$ cathode thin-film deposition on the SUS substrate by a sputtering method, a ${\beta}-Li_2MnSiO_4$ cathode thin film was successfully manufactured. The LiPON solid electrolyte was prepared by a reactive sputtering method using a $Li_3PO_4$ target and $N_2$ gas, and a homogeneous and flat thin film was deposited on a $Li_2MnSiO_4$ cathode thin film. In order to evaluate the electrochemical properties of the $Li_2MnSiO_4$ cathode thin films, coin cells using only a liquid electrolyte were prepared and the charge/discharge test was conducted. As a result, the amorphous thin film of RTP treated at $600^{\circ}C$ showed the highest initial discharge capacity of about $60{\mu}Ah/cm^2$. In cases of coin cells using liquid/solid double electrolyte, the discharge capacities of the $Li_2MnSiO_4$ cathode thin films were comparable to those without solid LiPON electrolyte. It was revealed that $Li_2MnSiO_4$ cathode thin films with LiPON solid electrolyte were applicable in thin film batteries.

All Solid State Electrochromic (전 고체형 일렉트로크로믹 소자)

  • 채종우;조봉희;김영호
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1996.05a
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    • pp.295-298
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    • 1996
  • In this study, we have fabricated all solid state electrochromic devices using WO$_3$ film as the working electrode, V$_2$O$\_$5/ film as the counter electrode and PEO-LiClO$_4$-PC film as the solid electrolyte. The WO$_3$ thin films for working electrode and V$_2$O$\_$5/ thin films for counter electrode were deposited onto ITO glass by vacuum evaporation and were shown good electrochromic and state properties after 1x10$\^$5/ cycles. PEO-LiClO$_4$-PC polymer electrolyte can easily be formed into thin films, do not absorb in the visible region of the light. Therefore, such electrolyte have electrochromic properties suitable for large-scale all solid-state electrochromic devices. All solid-staeelectrochromic devices fabricated in this polymer electrolyte have optical modulation of 20%∼30% at 1.5 V.

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Characterization of RF Sputter-deposited Sodium Phosphorous Oxynitride Thin Films as a Solid-state Sodium-ion Conductor

  • Chun, Sang-Eun
    • Journal of the Korean institute of surface engineering
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    • v.50 no.4
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    • pp.237-243
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    • 2017
  • We demonstrated the thin film deposition of sodium phosphorous oxynitride (NaPON) via RF magnetron sputtering of $Na_3PO_4$, as a solid-state Na-ion conductor similar to lithium phosphorous oxynitride (LiPON), which is a commonly used solid electrolyte. The deposited NaPON thin film was characterized by scanning electron microscopy, X-ray diffractometry, and electrochemical impedance spectroscopy, to investigate the feasibility of the solid-state electrolyte in several different cell configurations. The key properties of a solidstate electrolyte, i.e., ionic conductivity and activation energy, were estimated from the complex non-linear least square fitting of the measured impedance spectra at various temperatures in the range of $27-90^{\circ}C$. The ionic conductivity of the NaPON film was measured to be $8.73{\times}10^{-6}S\;cm^{-1}$ at $27^{\circ}C$, which was comparable to that of the LiPON film. The activation energy was estimated to be 0.164 eV, which was lower than that of the LiPON film (0.672 eV). The obtained values encourage the use of a NaPON thin film in the future as a reasonable solid-state electrolyte.

Deposition of Electrolyte for Intermediate Temperature Solid Oxide Fuel Cells by Combined Thin Film Deposition Techniques (복합 박막 증착 공정을 이용한 중저온 고체산화물 연료전지용 전해질 증착)

  • Ha, Seungbum;Jee, Sanghoon;Tanveer, Waqas Hassan;Lee, Yoonho;Cha, Suk Won
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.11a
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    • pp.84.1-84.1
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    • 2011
  • Typical solid oxide fuel cells (SOFCs) have limited applications because they operate at high temperature due to low ionic conductivity of electrolyte. Thin film solid oxide fuel cell with yttria stabilized zirconia (YSZ) electrolyte is developed to decrease operating temperature. Pt/YSZ/Pt thin film SOFC was fabricated on anodic aluminum oxide (AAO). The crystalline structure of YSZ electrolyte by sputter is heavily depends on the roughness of porous Pt layer, which results in pinholes. To deposit YSZ electrolyte without pinholes and electrical shortage, it is necessary to deposit smoother and denser layer between Pt anode layer and YSZ layer by sputter. Atomic Layer Deposition (ALD) technique is used to deposit pre-YSZ layer, and it improved electrolyte quality. 300nm thick Bi-layered YSZ electrolyte was successfully deposited without electrical shortage.

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Room Temperature Na/S Batteries Using a Thick Film of Na β"-Alumina Composite Electrolyte and Gel-Type Sulfur Cathode (후막 Na β"-Alumina 복합 고체 전해질 및 Gel-Type 유황 양극을 활용한 상온형 Na-S 전지의 특성 평가)

  • Lee, Jinsil;Yu, Hakgyoon;Lee, Younki;Kim, Jae-Kwang;Joo, Jong Hoon
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.33 no.5
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    • pp.411-417
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    • 2020
  • In this study, we introduce a Na β"-alumina composite thick film as a solid electrolyte, to reduce the resistance of electrolyte for a Na/S battery. An alumina/zirconia composite material was used to enhance the mechanical properties of the electrolyte. A solid electrolyte of about 40 ㎛ thick was successfully fabricated through the conversion and tape-casting methods. In order to investigate the effect of the surface treatment process of the solid electrolyte on the battery performance, the electrolyte was polished by dry and wet processes, respectively, and then the Na/S batteries were prepared for analyzing the battery characteristics. The battery with the dry process performed much better than the battery made with the wet process. As a result, the battery manufactured by the dry process showed excellent performance. Therefore, it is confirmed that the surface treatment process of the solid electrolyte has an important effect on the battery capacity and coulombic efficiency, as well as the interface reaction.

Fabrication of Solid Oxide Fuel Cells with Electron Beam Physical Vapor Deposition: I. Preparation of Thin Electrolyte Film of YSZ (전자빔 물리증착을 이용한 고체 산화물 연료전지의 제조 : I. YSZ 박막 전해질의 제조)

  • Kim, Hyoungchul;Koo, Myeong-Seo;Park, Jong-Ku;Jung, Hwa-Young;Kim, Joosun;Lee, Hae-Weon;Lee, Jong-Ho
    • Journal of the Korean Ceramic Society
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    • v.43 no.2 s.285
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    • pp.85-91
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    • 2006
  • Electron Beam Physical Vapor Deposition (EB-PVD) was applied to fabricate a thin film YSZ electrolyte with large area on the porous NiO-YSZ anode substrate. Microstructural and thermal stability of the as-deposited electrolyte film was investigated via SEM and XRD analysis. In order to obtain an optimized YSZ film with high stability, both temperature and surface roughness of substrate were varied. A structurally homogeneous YSZ film with large area of $12\times12\;cm^2$ and high thermal stability up to $900^{\circ}C$ was fabricated at the substrate temperature of $T_s/T_m$ higher than 0.4. The smoother surface was proved to give the better film quality. Precise control of heating and cooling rate of the anode substrate was necessary to obtain a very dense YSZ electrolyte with high thermal stability, which affords to survive after post heat treatment for fabrication a cathode layer on it as well as after long time operation of solid oxide fuel cell at high temperature.

Fabrication and Characterization of LIPON Electrolyte Thin Film for All Solid State Thin Film Battery (박막전지용 LIPON 전해질 박막의 제조 및 특성 평가)

  • 손봉희;전은정;남상철;조원일;윤영수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.11a
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    • pp.228-231
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    • 1999
  • The preparation and electrical properties of LIPON electrolyte were investigated in order to fabricate all solid state thin film battery. The LIPON thin film was deposited by r.f. sputtering of Li$_3$PO$_4$ target in O$_2$-N$_2$ mixtures. The LIPON deposited at N$_2$+10% O$_2$ ratio had a conductivity at 25 $^{\circ}C$ of 1.8${\times}$10$\^$-6/S/cm. The ion conductivity of the LIPON films decreased as the O$_2$ content of the process gas increased.

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Fabrication and Electrochemical Characterization of All Solid State Thin Film Micro-Battery by in-situ sputtering (In-situ 스퍼터링을 이용한 마이크로 박막 전지의 제작 및 전지 특성 평가)

  • 전은정;신영화;남상철;조원일;손봉희;윤영수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.11a
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    • pp.159-162
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    • 1999
  • All solid state thin film micro-batteries consisting of lithium metal anode, an amorphous LiPON electrolyte and cathode of vanadium oxide have been fabricated and characterized, which were fabricated with cell structure of Li/LiPON/V$_2$O$\sub$5/Pt. The vanadium oxide thin films were formed by d.c. reactive sputtering on Pt current collector. After deposition of vanadium oxide films, in-situ growths of lithium phosphorus oxynitride film were conducted by r.f. sputtering of Li$_3$PO$_4$ target in mixture gas of N$_2$ and O$_2$. The pure metal lithium film was deposited by thermal evaporation on thin film LiPON electrolyte. The cell capacity was about 45${\mu}$Ah/$\textrm{cm}^2$ $\mu\textrm{m}$ after 200 cycle. No appreciable degradation of the cell capacity could be observed after 50 cycles .

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Electrochemical studies of nano-scale solid electrolyte powder prepared by chemical synthesis process (화학적합성법에 의한 나노 고체 전해질 분말 합성 및 전기화학적 평가)

  • Kim, Young-Mi;Shin, Yu-Cheol;Kim, Ho-Sung
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.06a
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    • pp.295-298
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    • 2009
  • Oxygen ionic conductors of CeScSZ electrolyte in SOFC unit cell are applied to anode and cathode as well as electrolyte to have the triple-phase-boundaries of electrochemical reaction, and it is required to decrease the sintering temperature of anode-supported electrolyte by the nanoscale of CeScSZ electrolyte powder. In this report, nanoscale CeScSZ electrolyte powder was synthesized by chemical synthesis method. The particle size, surface area and morphology of the powder were observed by SEM and BET. Thin film electrolyte of under $10{\mu}m$ was fabricated by tape casting using the synthesized CeScSZ electrolyte powder, and ionic conductivity and gas permeability of electrolyte film were evaluated. Finally the SOFC unit cell was fabricated using the anode-supported electrolyte prepared by a tape casting method and co-sintering, in which the active layer, measuring $20{\mu}m$, was introduced in the anode layer to provide a more efficient reaction. Electrochemical evaluations of the SOFC unit cell, including measurements such as power density and impedance, were performed and analyzed.

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