Li-ion batteries: Phase transition

Progress in the research on phase transitions during Li+extraction/insertion processes in typical battery materials is summarized as examples to illustrate the significance of understanding phase transition phenomena in Li-ion batteries.Physical phenomena such as phase transitions(and resultant phase diagrams) are often observed in Li-ion battery research and already play an important role in promoting Li-ion battery technology. For example, the phase transitions during Li+insertion/extraction are highly relevant to the thermodynamics and kinetics of Li-ion batteries, and even physical characteristics such as specific energy, power density, volume variation, and safety-related properties.     

电阻型超导限流高压直流断路器研究

多端高压直流网络中的关键技术之一是直流线路故障时快速可靠地分断故障电流,为此本文研究了一种基于电阻型超导限流器的高压直流断路器。该断路器由限流与关断两部分组成,当线路发生故障时首先经过限流部分触发超导限流器,从超导态转变到正常态,产生电阻限制故障电流,且使故障电流转移到由全控型IGBT与避雷器并联组合成的支路上,进一步使故障电流减少,从而使隔离开关可靠断开,隔离故障线路。通过Matlab/simulink仿真表明,该断路器快速分断大故障电流可行。