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首页> 外文会议>Charging amp; infrastructure symposium 2018 >Sorption Equilibrium and Diffusional Resistance in Compounds of Li-Ion Batteries
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Sorption Equilibrium and Diffusional Resistance in Compounds of Li-Ion Batteries

机译：锂离子电池化合物的吸附平衡和扩散阻力

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摘要

Li-Ion batteries relieve daily life in their function as energy storage in many mobile and stationary applications. Ambitious aims of the German government as wells as the exhaust scandal encouraged the development of more efficient and inexpensive electric vehicles. An important cost factor in the manufacturing process of Li-Ion batteries poses the subsequent vacuum drying process. In this process moisture adsorbed from the air gets removed from the compounds of the battery by a high energy input. Otherwise, the adsorbed moisture reacts with the electrolyte in the operation of the battery, what leads to its degeneration. An unequivocal connection between the long-time stability of the battery and its residual moisture content has been found. In order to remove the moisture cost efficiently from the compounds of the battery, a precise and comprehensive knowledge of the sorption equilibrium and the kinetics of mass transfer is necessary. In this work, sorption equilibriums of the compounds of a Li-Ion battery have been ascertained by means of a magnetic suspension balance. In order to measure the sorption equilibrium at process-relevant conditions the sorption cell of one balance is perfused with moist air. As the amount of air in the gas flow poses an additional mass transport resistance another balance is operated at pure vapour. The equilibriums have been characterized by appropriate modelling that take into account the requirements of the drying process such as an existing temperature-dependence. It appeared that the sorption equilibrium of a ceramic separator exhibits a hysteresis and can be characterised by using a BET isotherm. Moreover, from these experiments first conclusions have been drawn regarding the limiting diffusional resistance in the drying process. The drying of the separator can be accelerated by controlling the gas flow of the overflowed air appropriately. The authors acknowledge financial support by the Federal Ministry of Education and Research via the ProCell cluster project Roll-It (contract number 03XP0080A).
机译：锂离子电池在许多移动和固定应用中的储能功能减轻了日常生活的负担。德国政府的雄心勃勃的目标以及废气丑闻鼓励了更高效，更便宜的电动汽车的发展。锂离子电池制造过程中的重要成本因素是随后的真空干燥过程。在此过程中，从空气中吸收的水分通过高能量输入而从电池的混合物中去除。否则，在电池工作时，吸附的水分会与电解质发生反应，从而导致其退化。已发现电池的长期稳定性与其残余水分之间的明确联系。为了有效地从电池的化合物中去除水分成本，对吸附平衡和传质动力学的准确而全面的了解是必要的。在这项工作中，已经通过磁悬浮平衡确定了锂离子电池化合物的吸附平衡。为了测量与过程相关的条件下的吸附平衡，将一种平衡的吸附池注入湿空气。由于气流中的空气量增加了附加的传质阻力，因此在纯蒸气下进行了另一种平衡。通过适当的建模来表征平衡，该建模考虑了干燥过程的要求，例如现有的温度依赖性。似乎陶瓷隔板的吸附平衡表现出滞后性，并且可以通过使用BET等温线来表征。此外，从这些实验中，已经得出关于干燥过程中的极限扩散阻力的第一结论。通过适当地控制溢流空气的气流，可​​以加速分离器的干燥。作者感谢联邦教育和研究部通过ProCell集群项目Roll-It（合同号03XP0080A）提供的资金支持。

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  • 会议地点 Mainz(DE)
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    Jochen Eser; Philip Scharfer; Wilhelm Schabel;

  • 作者单位

    Karlsruhe Institute of Technology, Institute for Thermal Process Engineering, Strasse am Forum 7, Karlsruhe, D-76131 Germany;

    Karlsruhe Institute of Technology, Institute for Thermal Process Engineering, Strasse am Forum 7, Karlsruhe, D-76131 Germany;

    Karlsruhe Institute of Technology, Institute for Thermal Process Engineering, Strasse am Forum 7, Karlsruhe, D-76131 Germany;

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