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Jo, Minki,Noh, Mijung,Oh, Pilgun,Kim, Youngsik,Cho, Jaephil Wiley Blackwell (John Wiley Sons) 2014 ADVANCED ENERGY MATERIALS Vol.4 No.13
<P>Among the various Ni-based layered oxide systems in the form of LiNi1-y-zCoyAlzO2 (NCA), the compostions between y = 0.1-0.15, z = 0.05 are the most successful and commercialized cathodes used in electric vehicles (EVs) and hybrid electric vehicles (HEVs). However, tremendous research effort has been dedicted to searching for better composition in NCA systems to overcome the limitations of these cathodes, particularly those that arise when they are used use at high discharge/charge rates (>5C) and in high temperature (60 degrees C) environments. In addition, improving the thermal stability at 4.5 V is also very important in terms of the total amount of heat generated and the onset temperature. Here, a new NCA composition in the form of LiNi0.81Co0.1Al0.09O2 (y = 0.1, z = 0.09) is reported for the first time. Compared to the LiNi0.85Co0.1Al0.05O2 cathode, LiNi0.81Co0.1Al0.09O2 exhibits an excellent rate capability of 155 mAh g(-1) at 10 C with a cut-off voltage range between 3 and 4.5 V, corresponding to 562 Wh kg(-1) at 24 degrees C. It additionally provides significantly improved thermal stability and electrochemical performance at the high temperature of 60 degrees C, with a discharge capacity of 122 mAh g(-1) after 200 cycles with capacity retention of 59%.</P>
Lee, Min-Joon,Noh, Mijung,Park, Mi-Hee,Jo, Minki,Kim, Hyejung,Nam, Haisol,Cho, Jaephil The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.25
<▼1><P>A nano-scale surface protecting layer of LiNi0.8Co0.15Al0.05O2 consisting of substituted V<SUP>4+</SUP> ions in 3b sites leads to structural robustness under the most challenging test conditions.</P></▼1><▼2><P>In order to overcome the inherent structural instability of bare LixNi0.8Co0.15Al0.05O2 (BNCA) containing large amounts of LiOH and Li2CO3 impurities at 60 and >200 °C, an effective nanoscale layer was generated by coating BNCA with an ammonium vanadate precursor, followed by annealing at 400 °C. This process forms a 17 nm thick surface layer containing V<SUP>4+</SUP> ions in the transition metal 3b sites, thereby decreasing the thickness of the cation-mixing layer, which is the main factor responsible for destabilizing the surface structure. Such a coating also helps in substantially reducing the amount of surface impurities of LiOH, Li2CO3, and H2O by forming LiVO2, LiV2O5, VO2, and V2O5. Consequently, at 60 °C, vanadium-treated LiNi0.8Co0.15Al0.05O2 (VNCA) demonstrated excellent cyclability with a discharge capacity of 179 mA h g<SUP>−1</SUP> after 200 cycles (after 17 days) between 3 and 4.3 V, corresponding to 90% capacity retention, which is 18% higher than the capacity retention measured for BNCA. More importantly, VNCA exhibits a significantly reduced heat generation and a higher onset temperature for exothermic reactions.</P></▼2>
Modified Return Routability를 이용한 Hierarchical Mobile IPv6 Handover 인증 기법
김정환 ( Junghwan Kim ),유기성 ( Kisung Yu ),박병연 ( Byungyeon Park ),노민기 ( Minki Noh ),문영성 ( Youngsong Mun ) 한국인터넷정보학회 2007 인터넷정보학회논문지 Vol.8 No.6
Hierarchical Mobile IPv6는 Binding Update를 지역적으로 관리함으로써 기존의 Mobile IPv6의 성능을 향상시킨 메커니즘이다. 이렇게 향상된 Handover Delay로 인하여 지연에 민감한 서비스들의(예를 들어, VoIP나 비디오 스트리밍(Video Streaming)) 지원이 좀 더 실현 가능해졌다. 하지만 기존 MIPv6와 비교해 볼 때, HMIPv6에서는 Local Binding Update와 관련된 보안 위협 사항이 새로이 생겨나게 되었으며 이는 반드시 해결되어야 할 문제임에도 불구하고 정확한 표준이 제시되지 않은 상황이다. 또한 많은 연구의 초점이 AAA나 인증서 기반의 PKI 등에 맞춰져 있는데, 이러한 Infrastructure 기반의 인증 방법은 실제 네트워크에 도입되었을 때 범용적으로 사용하기에는 문제점이 있다. 이에 본 연구에서는 수정된 Return Routability메커니즘을 적용하여 Local Binding Update를 인증하는 방안을 제안하며 아울러 이동 노드로 하여금 단말기의 파워(power)를 절약하게 하는 방안도 제공한다. Hierarchical Mobile IPv6 improves performance of Mobile IPv6 by managing Binding Update in terms of location. With improved handover delay, realization of delay-sensitive services (e.g. VoIP or video streaming) has become more persuadable. Comparing with Mobile IPv6, however, Hierarchical Mobile IPv6 brings security threats related to Local Binding Update to mobile network. In the RFC 4140, specific methods to authenticate Local Binding Update message are not explicitly presented. It is essential that design secure architecture to address problems related to authenticating Local Binding Update. Many secure suggestions for Local Binding Update, however, concentrate on infrastructure-based solutions such as AAA, PKI. These approaches may cause scalability problem when the suggested solutions are applied to real network. Therefore we suggest authentication method that doesn`t require infrastructure. In addition to authentication of Local Binding Update, our method also provides mobile node with power saving ability.