Novel materials for high capacity sulphur based batteries
One of the most promising chemistries for next generation batteries is based on the conversion of sulphur. As an example, the theoretical discharge capacity of a lithium-sulphur cell is 1675 mAh/g or 2500 Wh/kg. Sulphur can also be coupled to sodium or used in the form a metal sulphide (e.g. FeS2), still with superior capacity compared to Li-ion technology. Considering that the active material, sulphur, has a low cost and is abundant brings also the potential for a low cost and sustainable technology. However, even though sulphur-based batteries are very promising their theoretical capacity has so far not been realised in practice in a cell with long cycle life and high charge/discharge efficiency.
In this thesis, I present new materials concepts aiming to enable next generation high capacity batteries based on the conversion of sulphur. The main target has been to improve the capacity, but the materials used have also good perspective in terms of sustainability and price. A key to improve the properties has been to tailor materials on the nanoscale. One example is the fibre-based materials prepared by electrospinning. These include carbon structures for high capacity and high rate electrodes as well as gel-polymer electrolyte membranes. The results presented in the thesis show that high discharge capacity and good cycle performance can be achieved with the new materials concepts. The functional mechanisms behind the concepts is discussed and the role of different material aspects is revealed.
next generation batteries
Du Hyun Lim
Chalmers, Fysik, Kondenserade materiens fysik
Route to sustainable lithium-sulfur batteries with high practical capacity through a fluorine free polysulfide catholyte and self-standing Carbon Nanofiber membranes
Scientific Reports,; Vol. 7(2017)p. Article no. 6327 -
Artikel i vetenskaplig tidskrift
D.H. Lim, M. Agostini, J.H. Ahn, A. Matic, electrospun nano-fibre membrane as gel-based electrolyte for room temperature Na/S batteries
A. K. Haridas, J.E. Lim, D.H. Lim, J.K. Kim, K.K. Cho, A. Matic, J.H. Ahn, Electrospun core-shell nanofiber web as high performance cathode for iron disulfide-based rechargeable lithium batteries
M. Agostini, D.H. Lim, S. Brutti, N. Lindahl, J.H. Ahn, B. Scrosati, A. Matic, Free-standing 3-D sponged nano-fibre electrodes for ultrahigh-rate energy storage devices
M. Agostini, D.H. Lim, M. Sadd, J.Y. Hwang, S. Brutti, J.H. Ahn, Y.K. Sun, A. Matic, Towards low cost and high energy lithium sulfur batteries through the use of a tailored fluorine-free Li2S8 based electrolyte
Stabilizing the Performance of High-Capacity Sulfur Composite Electrodes by a New Gel Polymer Electrolyte Configuration
ChemSusChem,; Vol. 10(2017)p. 3490-3496
Artikel i vetenskaplig tidskrift
In order to challenge this energy crisis and to ensure a healthy, viable, and environmentally sound future, the world demands innovation in the energy sector. The best replacement for fossil fuels is the use of renewable energy resources - such as wind, solar, geothermal, tidal - which are constantly replenished and will never run out. However, their intrinsic issue of be unable to provide a continuous energy supply limits the prolific utilization of renewable energy systems. Therefore, a massive power storage system is required, such as rechargeable batteries, pumping-up power generation, flywheels, and compressed gas energy storage. Out of these listed methods, rechargeable batteries show many advantages in terms of high energy density and flexibility in design and low environmental impact if installations. Rechargeable batteries are already play a vital role in our everyday lives, by powering our smartphones, laptops, and power tools. Many of these are powered by Li-ion batteries which is currently the technology with the highest energy for a certain volume or weight, i.e. a small battery can power a device for a long time. However, for large scale applications, like electric cars, the performance is not good enough. In addition, from a sustainability point of view, the technology can also be improved, since today expensive and environmentally unfriendly metals are used. Thus, there is a large interest to develop new battery technologies.
One of the most promising technologies for future batteries for large scale energy storage is based on the conversion chemistry of sulphur. In theory a car powered by a sulphur-based battery could drive more than 1000 km on one charge. In addition, sulphur is abundant and cheap, the use of this technology would contribute to sustainable development within the energy storage market. Several advancements have been made, but still the technology is not ready to be applied in practical applications. To take this step, new materials with tailored properties need to be developed and this has been the topic of my thesis. By using materials modified from the very small length scales of atoms and up to improve the performance. Based on the results from my work several routes can be identified which can be taken to realise the potential of sulphur-based batteries, which both have very good performance and use environmentally friendly and low cost materials.
Innovation och entreprenörskap
Nanovetenskap och nanoteknik (SO 2010-2017, EI 2018-)
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 4413
Lecture Hall Kollektorn, MC2 building
Opponent: Professor Thomas Wågberg, Department of Physics Umeå University, Sweden