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Low-cost and highly safe solid-phase sodium ion battery with a Sn–C nanocomposite anode
유학균,서문규,김제하,김재광 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.100 No.-
With the use of a conducting ceramic-based solid-phase hybrid electrolyte, the batteries can maintainsafe and stable operation during the reversible insertion/extraction of sodium ions by the suppression ofsodium dendrites. Here, Sn–C nanocomposites are prepared by a simple one-pot synthesis process, andthey have a unique structure in which nanosized Sn particles are embedded in an amorphous carbon hostderived from sucrose. The Sn–C nanocomposite is used to fabricate a solid-phase sodium-ion batterywith a Na3Zr2Si2PO12 ceramic-based hybrid solid electrolyte. The Sn–C-based solid-phase sodium batteryshows high electrochemical performance with a high discharge capacity of 669.9 mA h g 1 at 0.2 C with aCoulombic efficiency close to 100%. The electrochemical alloy mechanism of the Sn–C nanocomposite isinvestigated by X-ray photoelectron spectroscopy. The good electrochemical performance demonstratesthe advantages of using the Na3Zr2Si2PO12 ceramic-based hybrid solid electrolyte and Sn–Cnanocomposite in solid-phase sodium ion batteries.
후막 Na β"-Alumina 복합 고체 전해질 및 Gel-Type 유황 양극을 활용한 상온형 Na-S 전지의 특성 평가
이진실,유학균,이윤기,김재광,주종훈,Lee, Jinsil,Yu, Hakgyoon,Lee, Younki,Kim, Jae-Kwang,Joo, Jong Hoon 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.5
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.
복합고체 전해질을 적용한 리튬이차전지의 전기화학적 특성
한종수,유학균,김재광 한국전기화학회 2021 한국전기화학회지 Vol.24 No.4
최근 리튬이차전지의 안전성을 향상시킨 전고체 전지가 많은 관심의 대상이 되고 있으나 전도성 세라믹 또는 고체 고분자 전해질을 적용한 고체전지는 높은 계면 저항, 부반응 등과 같은 문제점을 지니고 있어 전기화학적 특성이 낮다. 기존 전고체 전지의 이러한 문제점을 해결하기 위하여 복합고체 전해질이 제안되었으며 본 연구에서는 나시콘 구조의 나노 입자 Li1.5Al0.5Ti1.5P3O12 (LATP) 전도성 세라믹, PVdF-HFP, 카보네이티 기반 액체전해질을 복합화 하여 유사고체 전해질을 제작하였다. 이 복합고체 전해질은 5.6V의 높은 전압 안전성을 가지며 리튬이온의 탈리-착리 테스트에서 리튬 금속전극의덴드라이트 성장 억제 효과가 있음을 보여준다. 또한 복합고체 전해질을 적용한 LiNi0.83Co0.11Mn0.06O2 (NCM811)기반 전지에서 4.8V의 높은 충전 종지 전압에도 241.5mAh/g의 높은 방전 용량을 나타내며 안정적인 전기화학 반응이 일어난다. NCM811 기반 전지의 90도 충전-방전 중에도 전지의 단락이나 폭발 없이 139.4mAh/g 방전 용량을 보인다. 따라서 LATP기반 복합고체 전해질은 리튬이차전지의안전성과 전기화학적 특성을 향상 시킬 수 있는 효과적인 방법임을 알 수 있다.
한종수,황길찬,유학균,Du-Hyun Lim,조중상,Matthias Kuenzel,김재광,안주현 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
Safe andflexible batteries are expected to be the enabler for advancing the technology of wearableelectronics to an unforeseen level in near future. However, to date the energy density of such devices israther limited due to the rather large proportion of dead weight and volume to provide goodflexibility. Toovercome this hurdle, a disruptive change in the battery manufacturing process is needed. Herein, we notonly introduce a simple phase inversion method for the preparation of free-standing andflexible β-Na0.33V2O5 cathodes without metal current collector, but also demonstrate the possibility to integratethose into fullyflexible lithium metal batteries. Additionally, employing a LAGP-based hybrid solidelectrolyte enables excellent high temperature stability and thus, enhanced safety characteristics of thedevice. Such integratedflexible batteries exhibit fast and stable lithium-ion storage capabilities, with alarge specific capacity of 228 mA h g 1 at 0.1 C and excellent cycling stability translating into anoutstanding specific energy of 407.8 Wh kg 1 on electrode level.