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Flower-like NiCo2O4 prepared by gelatin template as an anode material for lithium ion batteries
신하은,이완진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
The flower-like NiCo2O4 particles are synthesized with gelatin via a hydrothermal method for Lithium ion batteries (LIBs). Gelatin as biotemplate makes metal precursors possible to be assembled around its hydrophilic group which creates flower-like morphology. This structure benefits electrochemical properties, offering i) its small crystal size which increases possibility of contact between charges, and ii) large surface area assisted by gelatin template which provides easy diffusion of electrolytes. Spinel lithium cobalt oxide renowned for its good electronic conductivity gives the advantage in migration of lithium ions. As a result, the flower-like NiCo2O4 particles show noticeable capacitance on the anode of LIBs.
Electrochemical properties of NiCo2O4 spherical clusters for lithium ion batteries
신하은,이완진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
The NiCo2O4 spherical cluster are prepared by hydrothermally treating microspheres comprised of metal precursors (nickel nitrate and cobalt nitrate) encapsulated on the surfaces of glucose-based carbon spheres as the template, followed by the calcination at 600°C. The nanostructured NiCo2O4 spherical cluster with spinel structure show high capacitance. Because of its spinel structure, nickel cobaltite has high electronic conductivity which allows easy electron flow. Each of spherical metal oxide grains offer increased electrochemical reaction sites compared with its raw crystal form. Additionally, the abundant voids generated by decomposition and removal of the carbon spheres as the template have an effect on the prevention of the volume expansion. These voids play an important role in maintaining the nanostructures during lithiation and delithiation. Therefore, that nano-sized spherical NiCo2O4 electrode demonstrates high electrochemical performance.
신하은,김채빈,안석훈,김두헌,임종국,고문주 한국복합재료학회 2019 Composites research Vol.32 No.6
To address tremendous needs for developing efficiently heat dissipating material with lightweights, a new class of polymer possessing recyclable and malleable characteristics was synthesized for incorporating model functional hexagonal boron nitride (h-BN) filler. A good interfacial affinity between the polymer matrix and the filler along with shear force generated upon manufacturing the composite yielded the final product bearing highly aligned filler via simple hot pressing method. For this reason, the composite exhibited a high thermal conductivity of 13.8 W/mK. Moreover, it was possible to recover the h-BN from the composite without physical/chemical denaturation of the filler by chemically depolymerizing the matrix, thus the recovered filler can be re-used in the future. We believe this polymer could be beneficial as matrix for incorporating many other functional fillers, thus they may find applications in various polymeric composite related fields. 본 연구에서는 재활용이 가능하며 열가소성 특성을 지닌 신규 고분자 수지를 개발하고 합성하였다. 이렇게 개발된 수지와 판상형 질화붕소(h-BN) 사이의 계면 친화성이 좋음을 계산과학을 통하여 확인하고 열압기(hot press)를 이용하여 복합소재를 제조하였다. 고분자 수지와 필러 사이의 계면 친화성과 함께 복합소재 제조시 발생되는 전단력(shear force) 만으로도 매우 높은 필러 정렬도를 지닌 복합소재를 제조할 수 있었고, 이러한 이유로 복합소재는 최대 13.8 W/mK의 높은 열전도도를 갖는 것을 확인하였다. 또한, 개발된 수지가 화학적으로 분해 가능한 장점을 이용하여 제조된 복합소재로부터 물리/화학적 변성 없이 필러를 회수할 수 있었고 이렇게 회수된 필러는 향후 다양한 신규 복합소재 제조에 재활용이 가능하다.
Flexible tin sulfide@carbon nanofibers anode for lithium ion batteries
신하은,황호진,이완진 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
A tin sulfide has attracted attention as an alternative anode material for lithium ion batteries due to its high theoretical specific capacity (782 mA h g<sup>-1</sup>). However, it is still limited to apply a tin sulfide in practical application because of its low rate capability and electrochemical stability by poor conductivity leading to undesirable charge transfer. To enhance electrochemical performance, the flexible tin sulfide@carbon nanofibers are synthesized by electrospinning the composite solution of tin acetate, PAN, and PVP in DMF, followed by heat treatment and a solvothermal method for sulfur coating. The SnS@CNF was directly used as an anode without using any binder or metal current collector. The SnS@CNF, the hybrid material of tin sulfide and carbon nanofiber, offers better electrochemical performance due to its 1D structure which allows facile electron transfer by decreasing resistance in both electron and electrolyte flow and maintaining structural integrity.