유기용매 전해조를 이용한 리튬이차박막전지용 Sn 음극의 제조
Preparation and Characterization of a Sn-Anode Fabricated by Organic-Electroplating for Rechargeable Thin-Film Batteries
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박막 리튬이차전지의 고용량 음극을 개발하기 위하여, Sn(II) 아세테이트를 포함한 유기전해조 도 금법을 이용하여 Sn 박막전극을 제조하였다. Li+와 Sn2+를 포함한 전해조에 대한 순환전위전류시 험 결과 3종류의 환원 반응이 나타났으며, 2.0∼2.5 V 영역이 Ni 집전체 표면에 대한 Sn의 석 출 반응에 해당한다. 수계전해액에 대한 Sn2+의 표준환원전위는 2.91 V vs. Li+/Li°인데 반해 유기전해조에서는 보다 낮은 전위에서 환원반응이 일어났다. 이는 유기전해질의 고저항과 Sn2+의 낮은 농도에 기인한 과전위의 결과로 생각된다. 제조한 전극의 물리적 특성 및 전기화학적 특성 을 연구하였다. 석출한 Sn 전극을 150oC로 열처리하여 보다 높은 결정성을 얻을 수 있었고, 이 를 Sn/Li 전지로 구성하여 전기화학적 실험을 한 결과 0.25 V와 0.75 V에서 각각 합금화-탈합 금화 과정을 확인 할 수 있었다. 제조한 전극의 두께를 전기량을 통하여 계산한 바 7.35 μm였 으며, 가역용량은 400 μAh/cm2을 얻었다
Abstract
Abstract : Sn-thin film as high capacitive anode for thin film lithium-ion battery was prepared by organic-electrolyte electroplating using Sn(II) acetate. Electrolytic solution including Li+ and Sn2+ had 3 reduction peaks at cyclic voltammogram. Current peak at 2.0~2.5 V region correspond to the electroplating of Sn on Ni substrate. This potential value is lower than 2.91 V vs. Li+/Lio, of the standard reduction potential of Sn2+ under aqueous media. It is the result of high overpotential caused by high resistive organic electrolytic solution and low Sn2+ concentration. Physical and electrochemical properties were evaluated using by XRD, FE-SEM, cyclic voltammogram and galvanostatic charge-discharge test. Crystallinity of electroplated Sn-anode on a Ni substrate could be increased through heat treatment at 150oC for 2 h. Cyclic voltammogram shows reversible electrochemical reaction of reduction(alloying) and oxidation(de-alloying) at 0.25 V and 0.75 V, respectively. Thickness of Sn-thin film, which was calculated based on electrochemical capacity, was 7.35 μm. And reversible capacity of this cell was 400 μAh/cm2
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