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固体核磁共振可检测锂电池内部结构

已有 7220 次阅读 2012-4-12 08:46 |系统分类:博客资讯| 电池, 核磁共振, 检测

美国纽约大学、纽约州立大学石溪分校和英国剑桥大学的研究人员开发出基于核磁共振成像(MRI)方法的锂电池内部检测技术,可为电池内部运作提供诊断服务,提高电池性能和安全性。相关研究成果发表在《自然—材料学》上。
 
锂电池充电时,锂纤维会附着在锂电池内部的碳电极上,会导致电池短路、过热着火,甚至爆炸。研究人员可利用该方法扫描分析锂电池内部的化学成分,消除隐患。。
 
核磁共振成像技术属于非侵入性技术,可以提供电池内部的微观结构,可视化电极表面上的微小变化。电解质和电极表面都可以使用这种可视化技术,提供了全面了解电池性能的变化进程。研究人员将进一步研究高清晰成像、成像时间更短的技术和方法,最终使电池更轻、更安全、更灵活。
 
该方法还可用于研究材料表面的不规则行为和裂缝,还可评估其他电化学设备,如燃料电池。该研究得到了美国能源部和美国国家科学基金会的资助。

  7Li MRI of Li batteries reveals location of microstructurallithium

There is an ever-increasing need for advanced batteries for portable electronics, to power electric vehicles and to facilitate the distribution and storage of energy derived from renewable energy sources The increasing demands on batteries and other electrochemical devices have spurred research into the development of new electrode materials that could lead to better performance and lower cost (increased capacity, stability and cycle life, and safety). These developments have, in turn, given rise to a vigorous search for the development of robust and reliable diagnostic tools to monitor and analyse battery performance, where possible, in situ. Yet, a proven, convenient and non-invasive technology, with an ability to image in three dimensions the chemical changes that occur inside a full battery as it cycles, has yet to emerge. Here we demonstrate techniques based on magnetic resonance imaging, which enable a completely non-invasive visualization and characterization of the changes that occur on battery electrodes and in the electrolyte. The current application focuses on lithium-metal batteries and the observation of electrode microstructure build-up as a result of charging. The methods developed here will be highly valuable in the quest for enhanced battery performance and in the evaluation of other electrochemical devices.

                 http://www.nature.com/nmat/journal/v11/n4/full/nmat3246.html#affil-auth



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