Invited Speaker: Nils Wagner

Start date:August 8, 2018 at 13:00

Nano technology in Li-ion batteries: Possibilities and Limitations

Research concerning Lithium based batteries started in the 1970s and rechargeable rocking chair type Li-ion batteries were commercialised in the early 1990s. As of today, Li-ion based chemistries are on the forefront of battery technology with respect to performance, cycling stability, self-discharge and expected lifetime. Numerous alternative electrode materials have been examined during the last decades, with the aim to increase the energy density, lifetime and safety of Li-ion batteries. Most of those materials come with challenges that might be addressed by reducing the particle dimensions, or the application of nanoscale coatings. This presentation will give a comprehensive description of Li-ion batteries in general and point out examples were nanotechnology could be employed to overcome material shortcomings. It also discusses limitations were nanotechnology might be interesting from a scientific point of view, but cannot be sought as a solution for commercial batteries. Examples included in this presentation are polyanion based cathode materials such as olivine-structured phosphates and transition metal orthosilicates. These materials suffer from low ionic and electronic conductivity values compared with oxide base cathode materials. Furthermore, focus will be given to silicon as alloying anode that could potentially replace the graphitic anode found in most commercial Li-ion batteries