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Park, Chanhwi,Lee, Sangsoo,Kim, Kyubeom,Kim, Minhee,Choi, Sunho,Shin, Dongwook The Electrochemical Society 2019 Journal of the Electrochemical Society Vol.166 No.3
<P>To enhance the packing density of composite cathode for all-solid-state lithium-ion batteries, the effect of a bimodal sized solid electrolyte was studied. The composite cathode, which is fabricated using the powder compression method, consisted of the cathode active material, a conductive agent, and the solid electrolyte. However, the composite cathode construction had voids. The voids in the composite cathode were restricted to ionic conduction between the cathode active materials and the solid electrolytes. Suppression of the voids in the composite cathode improved the electrochemical performance of the all-solid-state battery. A composite cathode using bimodal sized electrolyte powders demonstrated better cell performance than that using only fine or coarse sized electrolyte powders. These results demonstrated that the composite cathode using the bimodal sized electrolyte enhanced the electrochemical performance of the all-solid-state battery because it improved the packing density of the cathode.</P>
Park, Chanhwi,Lee, Sangsoo,Choi, Sunho,Shin, Dongwook Elsevier 2019 THIN SOLID FILMS - Vol.685 No.-
<P><B>Abstract</B></P> <P>For application to all-solid-state thin film batteries, lithium boron phosphorus oxynitride (LiBPON) thin films were fabricated by RF magnetron sputtering technique of lithium borate (Li<SUB>3</SUB>BO<SUB>3</SUB>) and lithium phosphate (Li<SUB>3</SUB>PO<SUB>4</SUB>) target under N<SUB>2</SUB> atmosphere. To investigate the mixed former effect upon the LiBPON thin films, we prepared various films with controlled B and P contents. The LiBPON thin film formulation with nearly equal B and P contents showed the highest room-temperature lithium ionic conductivity of 3.52 × 10<SUP>−6</SUP> S cm<SUP>−1</SUP> and the lowest activation energy of 48.24 kJ mol<SUP>−1</SUP> owing to the mixed former effect, the increased lithium content and nitridation. Infrared spectra of the glass thin films achieved two dominant peaks corresponding to BO<SUB>3</SUB> <SUP>3−</SUP> and PO<SUB>4</SUB> <SUP>3−</SUP> unit. N1s spectra were analyzed by X-ray photoelectron spectroscopy that the increased ionic conductivities observed were related to the formation of triply coordinated nitrogen.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Lithium boron phosphorus oxynitride (LiBPON) were fabricated by RF magnetron sputtering. </LI> <LI> LiBPON shows the conductivity of 3.52 × 10<SUP>−6</SUP> S cm<SUP>−1</SUP> and the activation energy of 0.50 eV. </LI> <LI> Due to the mixed former effect and the nitridation effect the ionic conductivity is increased. </LI> </UL> </P>
박소희 ( Sohee Park ),석현덕 ( Hyundeok Seok ),이찬휘 ( Chanhwi Lee ) 한국산림경제학회 2015 산림경제연구 Vol.22 No.1
지역임업이란 전통적으로 산림을 이용해왔으며 산림관리에 대한 의무를 수용할 의지가 있는 지역 주민들에게 산림관리에 대한 권리와 책임을 이전하는 것을 말한다. 특히, 개발도상국에서는 가난 극복이라는 국가 정책 목표와 맞물려 수십 년 동안 지역임업을 추진했다. 이 논문의 목적은 부탄 지역임업의 발달과정과 관리체계, 정책, 성과를 분석하여 국내 지역임업의 활성화를 위한 시사점을 제시하는 것이다. 부탄은 국가 지역임업 전략을 수립하고 지역림관리단체의 산림 이용 및 접근에 관한 권리를 법적으로 인정함으로써 지역임업 사업을 전국으로 확대하였으며, 이로 인해 현재 부탄에는 500개 이상의 지역림관리단체들이 설립되었다. 우리나라도 지역임업을 활성화하기 위해 우리나라 실정에 맞는 국가 전략 및 유형별 사업 추진전략, 법 등을 개발하는 것이 필요하고, 아직 부탄에서도 부재하는 객관적인 지역임업 성과지표를 개발하여 지역임업의 발전에 기여할 필요가 있다. Community forestry(CF) refers to handing over the rights and responsibilities of forest management to the local people, who have traditionally used the forests and are willing to accept management responsibilities. Especially, developing countries have implemented CF with their national goals to reduce poverty for several decades. This study aims to analyze the development process, management system, policies and outcomes of CF in Bhutan in order to apply the experience of Bhutan to CF in Korea. Bhutan government established national strategy for CF and developed rules which guarantee that community forest management group(CFMG) members have rights to access and use forest products in their community forests. It results in more than 500 community forests in Bhutan. Similarly, we need to develop appropriate national strategy, action plans, acts and rules, and evaluative criteria for CF to vitalize CF in Korea.
High performance all-solid-state lithium-sulfur battery using a Li<sub>2</sub>S-VGCF nanocomposite
Eom, Minyong,Son, Seunghyeon,Park, Chanhwi,Noh, Sungwoo,Nichols, William T.,Shin, Dongwook Pergamon Press 2017 Electrochimica Acta Vol. No.
<P><B>Abstract</B></P> <P>In lithium-sulfur batteries, cyclability is often strongly limited by a high interfacial resistance caused by poor contact between the active material and electron and lithium ion transporting materials. Here, we develop a Li<SUB>2</SUB>S-VGCF (Vapor Grown Carbon Fiber) nanocomposite positive electrode for an all-solid-state lithium-sulfur battery that significantly improves cyclability. The Li<SUB>2</SUB>S-VGCF nanocomposite is prepared by a solution-based technique with subsequent heat-treatment in order to control the formation of Li<SUB>2</SUB>S nanocrystals within the VGCF electron conducting matrix. The small, well-dispersed Li<SUB>2</SUB>S nanocrystals offer a large contact area with the solid electrolyte and electron conducting carbon in the composite cathode. To further improve conductivity, the composite cathode employs a multi-dimensional approach with long 1-D VGCF fibers supporting long distance electron transport and 0-D carbon powder enhancing the contact area with the Li<SUB>2</SUB>S active material at lower total carbon content. In the all-solid-state batteries, the highest initial capacity of 469mhA∙g<SUP>−1</SUP> is obtained at conditions of 500°C during heat-treatment. Activation of Li<SUB>2</SUB>S is observed during the first 10 cycles. Subsequently, the capacity gradually increased up to 600mAh∙g<SUP>−1</SUP> (g of Li<SUB>2</SUB>S). The optimized cell exhibits excellent cyclic performance through 20 cycles and a Coulombic efficiency of ∼100%.</P>