LiNi0.5Mn1.5O4, the cathode material for 5V lithium ion batteries, was synthesized through the coprecipitation-combustion process in air. The effect of tempering temperature on the structure, morphology and electrochemical performances were investigated. The phase and electrochemical properties of the samples were characterized by powder X-ray diffraction, scanning electron microscopy and constant current charge-discharge tests. The experimental results indicate that the samples tempered at 800°C-900°C all have spinel structure, with the increase of tempering temperature, the crystallinity and grain size of the sample increase.The sample tempering at 850°C has well-developed crystals, moderate crystal size and the best electrochemical performance.
通过合理设计和合成过渡金属配合物,并配以合适的连接基团,使其与PCN共价键结合是金属配合物与PCN共价键结合的可行途径.总结了近年来单独的铁金属配合物在光催化还原CO2 中的应用,介绍了铁金属配合物/PCN体系光催化还原二氧化碳的最新进展为研究铁金属配合物/PCN光催化还原CO2 奠定了理论基础.
氧杂蒽结构是一类重要的荧光发色团,作为构建荧光探针的平台,受到了研究者的广泛关注.识别机制基于环的开关来实现荧光信号的有无.氧杂蒽类探针的研究从最初的离子识别到生物小分子识别、医学诊疗等方面,都取得了很大的进展.综述了近年来氧杂蒽类荧光探针的识别性能,对探针的设计思路及识别机制进行了总结.
介绍了一例某自备电站6kV配电室隔离开关柜短路事故.通过现场勘查,保护参数分析,对隔离开关柜短路烧坏的原因进行了分析,并针对性地提出了防范解决措施.针对事故的现场处置情况,查找不足,进行了总结,并对原应急预案进行优化完善,希望能为相关专业人员提供借鉴.
