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Lee, Kanghyeon,Yang, Gene Jaehyoung,Kim, Hackyeon,Kim, Taejoong,Lee, Sun Sook,Choi, Si-Young,Choi, Sungho,Kim, Yongseon Elsevier Sequoia 2017 Journal of Power Sources Vol. No.
<P><B>Abstract</B></P> <P>The coating effects of electronically and ionically conductive materials on the surface of LiNi<SUB>0.5</SUB>Mn<SUB>1.5</SUB>O<SUB>4</SUB> (LNMO) cathodes for Li-ion batteries are examined. In order for the coating layers to promote facile electrochemical reactions, in addition to their protective functions of blocking side reactions between the LNMO surface and the electrolyte, carbon and Li<SUB>2</SUB>O–2B<SUB>2</SUB>O<SUB>3</SUB> (LBO), which conduct electrons and Li ions, respectively, are chosen as coating materials. The properties of the LBO–carbon composite coating are examined in comparison with those of carbon- or LBO-only coatings. Electrochemical metrics, such as discharge capacity, rate performance, and cyclability, are improved with the addition of the thin-film coatings. The LBO–carbon coating shows the best overall properties, particularly greatly improved capacity retention under elevated-temperature (60 °C) cycling. The multi-conductive feature of LBO–carbon for both electrons and Li ions provides stable electrochemical kinetics under conditions of severe side reactions at elevated temperatures. The proposed simple one-step aqueous process for forming and applying the composite electrode coating may be extended to other materials and the mass production thereof.</P> <P><B>Highlights</B></P> <P> <UL> <LI> LiNi<SUB>0.5</SUB>Mn<SUB>1.5</SUB>O<SUB>4</SUB> cathode is coated with a multi-conductive composite film of LBO and C. </LI> <LI> The elevated-temperature cyclability greatly improves with the LBO–C coating. </LI> <LI> The capacity and rate performance are improved by coating the cathode. </LI> <LI> A cheap and easily scalable process for cathode coating is designed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
이강현(KangHyeon Lee),박진성(JinSeong Park),한승조(SeungJo Hanp) 한국정보과학회 1994 한국정보과학회 학술발표논문집 Vol.21 No.2B
오늘날 우리사회는 컴퓨터 통신망을 통한 정보교환이 급속히 증대됨에 따라 전송 도중 정보가 노출되거나 변경되는 것을 방지하기 위해서 정보 보호를 위한 암호화가 요구된다. 암호알고리즘에서 가장 많이 사용되고 있는 것은 DES이다. 그러나 최근에 하드웨어기 급속히 발달함에 따라 DES의 비도는 상대적으로 감소될 가능성이 있다. 따라서 본 논문에서는 DES의 암호알고리즘의 비도를 향상시키기 위해서 암호분석의 평가지표에 따라 DES를 확장하여 H/W를 설계하며, H/W로 설계한 확장된 DES를 현존하는 모뎀 내에 두도록 하여 암호기능이 추가된 Secure 모뎀을 제안한다.