首页 | 通知公告

通知公告

题目:3D Laser Battery – Design and manufacturing of high power / high energy lithium-ion cells

报告人:Wilhelm Pfleging, Karlsruhe Institute of Technology, IAM-AWP

报告时间及地点:2017.05.10 (星期三)上午9点,理科楼M314(固体所)

报告人简介:

Dr. Wilhelm Pfleging is head of the group Laser Materials Processing at the Institute of Applied Materials (IAM-AWP) which is part of the Karlsruhe Institute of Technology (KIT). He has more than 20 years of experience in Laser Technology. He has published over 150 peer-reviewed articles in scientific journals, books and conference reports. He has four patents granted and 1 patent on pending. At KIT he initiates and manages several industrial collaborative research and development projects on laser applications with emphasis on laser ablation, surface modification and welding on micrometer and nanometer scale. Since more than eight years, his research is mainly focused on the development of laser-assisted processes,analytics and manufacturing for advanced lithium-ion batteries (3D Battery).

报告内容简介:

 Thick film electrodes in lithium-ion cells are complex multi-material systems with defined material components, grain sizes, porosities, and pore size distributions in the micrometer and sub-micrometer ranges. The development of three-dimensional (3D) cell architectures for electrodes in lithium-ion batteries is one promising approach to overcome limitations in lithium-ion diffusion kinetics, high inter-electrodeohmic resistances, and mechanical stresses due to high volume changes during battery operation. 3D battery architectures can realize large areal energy capacities while maintaining high power densities at the same time.

Laser materials processing in manufacturing of Li-ion batteries is a rather new technological approach which enables rapid manufacturing, high reliability, and a reduction of production costs. Laser cutting and welding processes for batteries are already available for advanced industrial production. Laser micro-structuring of battery materials has a huge impact on battery performance and an up-scaling for industrial production is investigated. Advanced laser generated 3D surface architectures in battery materials improve Li-ion diffusion kinetics. This design concept can be applied for thin film micro-batteries as well as for high power thick film Li-ion batteries. Due to optimized laser processing a significant improvement of electrode and separator wetting with liquid electrolyte can be achieved. Both, the improvement in Li-ion diffusion kinetics and the turn of battery materials into superwicking deliver advanced battery performances. Electrochemcial analysis showed that a steep rise of capacity retention at high charging and discharging currents and an improved cell lifetime can be obtained in comparison to standard cells with unstructured battery materials.Post-mortem analysis of electrodescould be successfully applied over large areas and depths by laser-induced breakdown spectroscopy (LIBS) and it could be shown that 3D architectures act as an attractor for lithium-ions and a boost of battery performancecan be achieved.

Contact: Dr. Yuefei Zhang, yfzhang@bjut.edu.cn