Projects / Programmes
Composites for high power density Li-ion batteries
Code |
Science |
Field |
Subfield |
2.04.00 |
Engineering sciences and technologies |
Materials science and technology |
|
Code |
Science |
Field |
P360 |
Natural sciences and mathematics |
Inorganic chemistry |
P401 |
Natural sciences and mathematics |
Electrochemistry |
T140 |
Technological sciences |
Energy research |
T150 |
Technological sciences |
Material technology |
T152 |
Technological sciences |
Composite materials |
lithium ion batteries, supercapacitors, composites, electrochemistry, material science
Researchers (13)
no. |
Code |
Name and surname |
Research area |
Role |
Period |
No. of publicationsNo. of publications |
1. |
11517 |
PhD Marjan Bele |
Materials science and technology |
Researcher |
2008 - 2011 |
546 |
2. |
19277 |
PhD Robert Dominko |
Materials science and technology |
Head |
2008 - 2011 |
746 |
3. |
28564 |
PhD Boštjan Erjavec |
Chemistry |
Junior researcher |
2008 - 2011 |
136 |
4. |
00582 |
PhD Miran Gaberšček |
Materials science and technology |
Researcher |
2008 - 2011 |
900 |
5. |
25788 |
PhD Boštjan Genorio |
Materials science and technology |
Researcher |
2010 - 2011 |
323 |
6. |
10180 |
PhD Janko Jamnik |
Materials science and technology |
Researcher |
2009 - 2011 |
337 |
7. |
27920 |
Gregor Kapun |
Chemistry |
Researcher |
2008 - 2011 |
103 |
8. |
14115 |
PhD Marjan Marinšek |
Materials science and technology |
Researcher |
2008 - 2011 |
569 |
9. |
24976 |
PhD Milena Martins |
Materials science and technology |
Technical associate |
2008 - 2011 |
102 |
10. |
28561 |
PhD Jože Moškon |
Materials science and technology |
Researcher |
2008 - 2011 |
87 |
11. |
08353 |
PhD Barbara Novosel |
Materials science and technology |
Researcher |
2009 - 2011 |
467 |
12. |
01859 |
PhD Radovan Stane Pejovnik |
Materials science and technology |
Researcher |
2008 - 2011 |
530 |
13. |
07557 |
PhD Klementina Zupan |
Materials science and technology |
Researcher |
2008 - 2011 |
241 |
Organisations (2)
Abstract
Energy storage is unquestionably one of the great challenges in modern society. Exploitation of renewable energy sources (photovoltaic, wind energy, breaking energy, etc.) is credible if new power sources with both high energy density and, simultaneously, high power density are developed. One of the most serious candidates as appropriate energy conversion and storage systems are lithium ion batteries with high volumetric (300 Wh×kg-1) and gravimetric (130 Wh×kg-1) specific energy density. The proposed system has several advantages if compared to other types of batteries, like large capacity, energy density and working voltage. By contrast, the power density of Li batteries still cannot fulfil all the demands of consumers (a good example of high power products are hybrid electric vehicles (HEV)). This drawback can be alleviated by introduction of nanostructured materials with short diffusion paths for lithium in the solid matrix and a large surface area for minimization of reaction resistance. However, by introducing nanostructured materials we also introduce the problem of supplying the tiny material units with lithium ions and electrons (the problem is known as the problem of electrochemical wiring). This problem can, in principle, be overcome by the use of mesoporous and macroporous active materials with a wall thickness of about 10-20 nm. Short diffusion paths and porous matrix are two of three essential parameters for high power batteries. The third parameter, the proper electrical wiring, can be achieved by coating the porous material with a thin layer of electrically conductive layer. Even more, if the surface of active material is further coated with special phases that have ability to accommodate large amounts of lithium (as a buffer layer), we can expect to get a device having both a fast kinetics and a high energy density.
Significance for science
For the efficient energy storage in short time we need batteries that enable high power density. This is possible to achieve with a proper structuring of the electrode composite. Full understanding of the proper structuring of the electrode composite is available only in few research laboratories worldwide, namely special structuring is needed which enables parallel wiring of active material with electron and ions. Synthesis and structuring of the composites with parallel wiring is very complex and this research is very rare in the field of lithium ion batteries. We showed that with a proper approach some of selected electrode materials can be used as storage materials at low and at high current loadings. The concept shown on TiO2 based composites, where improvement of high power density with ceramic coatings was achieved, gave us a deep understand of the properties of this phenomenon where insulating ceramic additives significantly improve high rate performance of anatase phase. Results were published in several appears and reported as an oral contributions in energy related conferences. Different ceramic additives were tested in the combination with titanium oxide nanotubes and conclusion form this study can be summarized that the best electrochemical activity at high rates was achieved by optimal porosity. The mesoporous volume was found very important. We showed during the second year that such an approach can be used only with active materials that have activity in the stability window of electrolytes. This research is not just limited to the field of lithium ion batteries but also in other systems where we need to ensure uniform distribution of constituent in two phase systems, like solar cells or three phase systems, like fuel cells.
Results of the work on this project have been published in the journals with the highest impact factor on the field of material science (one paper in Nature Materials and one paper in Advanced Materials) and on the field of electrochemistry (Electrochemistry Communications). Quality of the journals and citations that our papers already have show importance of our achievments on the field of science. Those measureable indicators point out the importance of the work for the science.
Significance for the country
Project is connected with research activities on the energy storage which have primary interest on the worldwide level. This confirms presence of many car companies with electric vehicles or hybrid electric vehicles on the market and others are announcing their cars in a year or two. Recent results obtained on this project is promoting our project group and research group to the top world class groups, what is at the same time also a promotion for Slovenia as a country on the research field and within the group of potential industrial partners interested into this kind of research. Results in this project have been reported in two invited lectures and several oral presentations in almost all important meetings of materials society and lithium ion batteries society. During the second year of the project two Erasmus Mundus master students (one from France and one from Cameron) joined our group and they performed research within the scope of the project. Both students successfully defeat their master thesis and they are continuing their research as PhD students in European laboratories, which belong to the virtual laboratory on Li-ion batteries (ALISTORE-ERI). Our activity and the activity of our former students in this network are making our visibility to whole European institutes and Universities in the area of energy storage as well as to all European industry on this field. This is at the same time also promotion for Slovenia.
During the project duration, two young researchers financed by Slovenian Research Agency (ARRS) were actively involved into the work on the project. First, who studied kinetics mechanisms during battery operation and thermodynamic efficiency of lithium ion batteries, has finished his PhD in November 2011 and the second one who worked on the preparation techniques for batteries composites (for high power lithium ion batteries) and their characterization is having PhD defense at the end of April 2011. During his last one and half of year he was also a partial employee of the co-financing company (Iskra TELA, PE baterije ZMAJ) and he is going to take a partial position of the researcher also after PhD defense.
Nevertheless that our project partner is not a producer of Li-ion batteries, this work has direct and indirect impact on our industrial partner Iskra TELA, PE baterije ZMAJ. With this project they have insight into new technologies and the latest achievements on this field and they can use the knowledge from the project for improvements of their products, what has an impact on their stability and economy. Furthermore project coordinator helps them in activities connected with a development of new products which will rely on the Li-ion batteries and solar panels.
Most important scientific results
Annual report
2008,
2009,
final report,
complete report on dLib.si
Most important socioeconomically and culturally relevant results
Annual report
2008,
2009,
final report,
complete report on dLib.si