• 제목/요약/키워드: Solid Electrolytes

검색결과 233건 처리시간 0.03초

Li2O Co-Sputtering을 통한 비정질 LLZO 고체전해질의 전기화학 특성 평가 (Evaluation of Electrochemical Properties of Amorphous LLZO Solid Electrolyte Through Li2O Co-Sputtering)

  • 박준섭;김종헌;김현석
    • 한국재료학회지
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    • 제31권11호
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    • pp.614-618
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    • 2021
  • As the size of market for electric vehicles and energy storage systems grows, the demand for lithium-ion batteries (LIBs) is increasing. Currently, commercial LIBs are fabricated with liquid electrolytes, which have some safety issues such as low chemical stability, which can cause ignition of fire. As a substitute for liquid electrolytes, solid electrolytes are now being extensively studied. However, solid electrolytes have disadvantages of low ionic conductivity and high resistance at interface between electrode and electrolyte. In this study, Li7La3Zr2O12 (LLZO), one of the best ion conducting materials among oxide based solid electrolytes, is fabricated through RF-sputtering and various electrochemical properties are analyzed. Moreover, the electrochemical properties of LLZO are found to significantly improve with co-sputtered Li2O. An all-solid thin film battery is fabricated by introducing a thin film solid electrolyte and an Li4Ti5O12 (LTO) cathode; resulting electrochemical properties are also analyzed. The LLZO/Li2O (60W) sample shows a very good performance in ionic conductivity of 7.3×10-8 S/cm, with improvement in c-rate and stable cycle performance.

$CeO_2$계 복합산화물 고체 전해질 제조와 전기전도 특성에 관한 연구 (Investigation on the Preparation and Electrical Conductivity of $CeO_2$-System Solid Electrolytes)

  • 장복기;;김영식
    • 한국세라믹학회지
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    • 제32권2호
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    • pp.155-162
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    • 1995
  • Solid oxide electrolytes of the MCe1-xGdxO3-x/2 (M: Ba, Mg. x=0.0-0.20) system were prepared using powders synthesized by the "liquid mix" method and calcined from the cross-linked polyacrylic polymer. The specimens were analyzed using XRD and SEM with EDX, and the sintering behavior of the electrolytes and their electrical conductivity were also studied. Although Mg-cerate is relatively inferior to Ba-cerate in the sinterability and chemical homogenity(EDX analysis data), both the Ba- and the Mg-cerate electrolytes at 80$0^{\circ}C$ show their maximum conductivities at x=0.10 and their values are in the same order of magnitude, i.e., 3.5$\pm$0.17.10-2(ohm.cm)-1.ohm.cm)-1.

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차세대 리튬이차전지용 고체 전해질 기술 (Solid Electrolyte Technologies for Next-Generation Lithium Secondary Batteries)

  • 김광만;오지민;신동옥;김주영;이영기
    • 전자통신동향분석
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    • 제36권3호
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    • pp.76-86
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    • 2021
  • Technologies for lithium secondary batteries are now increasingly expanding to simultaneously improve the safety and higher energy and power densities of large-scale battery systems, such as electric vehicles and smart-grid energy storage systems. Next-generation lithium batteries, such as lithium-sulfur (Li-S) and lithium-air (Li-O2) batteries by adopting solid electrolytes and lithium metal anode, can be a solution for the requirements. In this analysis of battery technology trends, solid electrolytes, including polymer (organic), inorganic (oxides and sulfides), and their hybrid (composite) are focused to describe the electrochemical performance achievable by adopting optimal components and discussing the interfacial behaviors that occurred by the contact of different ingredients for safe and high-energy lithium secondary battery systems. As next-generation rechargeable lithium batteries, Li-S and Li-O2 battery systems are briefly discussed coupling with the possible use of solid electrolytes. In addition, Electronics and Telecommunications Research Institutes achievements in the field of solid electrolytes for lithium rechargeable batteries are finally introduced.

Linear and network structures of polymer electrolyte based on phosphate and polyether copolymers

  • Kim, Jun-Young;Kim, Seong-Hun
    • 한국섬유공학회:학술대회논문집
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    • 한국섬유공학회 1998년도 가을 학술발표회논문집
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    • pp.232-235
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    • 1998
  • ion conducting polymers have been extensively investigated because of their potential application as an electrolyte in solid state batteries [1]. Among the polymer electrolytes, solid polymer electrolytes (SPEs) composed of ion conducting polymer and alkali metal salt have many advantages such as high ionic conductivity, high energy density and light weight. This made them suitable replacement for liquid electrolytes. (omitted)

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A Superior Description of AC Behavior in Polycrystalline Solid Electrolytes with Current-Constriction Effects

  • Lee, Jong-Sook
    • 한국세라믹학회지
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    • 제53권2호
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    • pp.150-161
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    • 2016
  • The conventional brick-layer model is not satisfactory either in theory or in practice for the description of dispersive responses of polycrystalline solid electrolytes with current-constriction effects at the grain boundaries. Parallel networks of complex dielectric functions have been shown to successfully describe the AC responses of polycrystalline sodium conductors over a wide temperature and frequency range using only around ten model parameters of well-defined physical significance. The approach can be generally applied to many solid electrolyte systems. The present work illustrates the approach by simulation. Problems of bricklayer model analysis are demonstrated by fitting analysis of the simulated data under experimental conditions.

Electrochemical properties of PEO-based solid polymer electrolytes blended with different room temperature ionic liquids

  • Kim, Y.H.;Cheruvally, G.;Choi, J.W.;Ahn, J.H.;Kim, K.W.;Ahn, H.J.;Song, C.E.;Choi, D.S.
    • 한국고분자학회:학술대회논문집
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    • 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
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    • pp.276-276
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    • 2006
  • The incorporation of room temperature ionic liquids (IL) in poly (ethyleneoxide)-lithium salt (PEO-LiX) based solid polymer electrolytes is presently being studied as an effective means of enhancing the room temperature ionic conductivity of these electrolytes to acceptable levels for use in lithium batteries. In the present study, $PEO_{20}-LiTFSI$ solid polymer electrolyte was blended with three different ionic liquids, namely 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (BMIMTFSI), 1-butyl-3-methylimidazolium tetraflouroborate (BMIMBF4) and 1-butyl-3-methylimidazolium trifluromethanesulfonate ($BMIMCF_{3}SO_{3}$). The incorporation of all these ILs resulted in the enhancement of ionic conductivity, the effect being more pronounced at lower temperatures. Electrochemical properties of the blended electrolytes were studied by cyclic voltammetry, linear sweep voltammetry and interfacial resistance measurements. The optimum results were obtained with the blending of BMIMTFSI in the solid polymer electrolyte.

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고에너지 전고체 전해질을 위한 나노스케일 이종구조 계면 특성 (Nanoscale Characterization of a Heterostructure Interface Properties for High-Energy All-Solid-State Electrolytes )

  • 황성원
    • 반도체디스플레이기술학회지
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    • 제22권1호
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    • pp.28-32
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    • 2023
  • Recently, the use of stable lithium nanostructures as substrates and electrodes for secondary batteries can be a fundamental alternative to the development of next-generation system semiconductor devices. However, lithium structures pose safety concerns by severely limiting battery life due to the growth of Li dendrites during rapid charge/discharge cycles. Also, enabling long cyclability of high-voltage oxide cathodes is a persistent challenge for all-solid-state batteries, largely because of their poor interfacial stabilities against oxide solid electrolytes. For the development of next-generation system semiconductor devices, solid electrolyte nanostructures, which are used in high-density micro-energy storage devices and avoid the instability of liquid electrolytes, can be promising alternatives for next-generation batteries. Nevertheless, poor lithium ion conductivity and structural defects at room temperature have been pointed out as limitations. In this study, a low-dimensional Graphene Oxide (GO) structure was applied to demonstrate stable operation characteristics based on Li+ ion conductivity and excellent electrochemical performance. The low-dimensional structure of GO-based solid electrolytes can provide an important strategy for stable scalable solid-state power system semiconductor applications at room temperature. The device using uncoated bare NCA delivers a low capacity of 89 mA h g-1, while the cell using GO-coated NCA delivers a high capacity of 158 mA h g−1 and a low polarization. A full Li GO-based device was fabricated to demonstrate the practicality of the modified Li structure using the Li-GO heterointerface. This study promises that the lowdimensional structure of Li-GO can be an effective approach for the stabilization of solid-state power system semiconductor architectures.

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촉진수송 및 태양전지용 분리막 (Polymer Electrolytes and their Application to Solar Cells and Separation Membranes)

  • 강용수
    • 한국막학회:학술대회논문집
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    • 한국막학회 2004년도 첨단 분리막 연구동향
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    • pp.13-35
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    • 2004
  • Metal Complexes in Macromolecules Applications of Polymer Electrolyte Membranes Facilitated Transport in Solid State Roles of Electrolytes in Solar Cells - Electrolytes :ㆍI- and $I_3$-conductor ㆍelectron barrier or hole conductor ㆍelectrochemical redox reaction media ㆍinterfacial contactor for dye, $TiO_2$ and electrode ㆍmechanical separator (omitted)

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원자층 증착법을 통한 고체산화물 연료전지의 세라믹 인터페이스 제어 (Control of solid oxide fuel cell ceramic interfaces via atomic layer deposition)

  • 서종수;정우철;김정환
    • 세라미스트
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    • 제23권2호
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    • pp.132-144
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    • 2020
  • Solid oxide fuel cell (SOFC) have attracted much attention due to clean, efficient and environmental-friendly generation of electricity for next-generation energy conversion devices. Recently, many studies have been reported on improving the performance of SOFC electrodes and electrolytes by applying atomic layer deposition (ALD) process, which has advantages of excellent film quality and conformality, and precise control of film thickness by utilizing its unique self-limiting surface reaction. ALD process with these advantages has been shown to provide functional ceramic interfaces for SOFC electrodes and electrolytes. In this article, recent examples of successful functionalization and stabilization on SOFC electrodes and electrolytes by the application of ALD process for realizing high performance SOFC cells are reported.