STRESSBAT

Microbatteries open the possibility to address very large and diversified markets (real time clock, RFID tags, wireless autonomous sensors, internet security...). This technology has now proven a good level of maturity and its high industrial potential. A marketing and technological Road Map is thus available. In order to be able to reach the objectives, it becomes necessary to have an efficient and high level modelling and simulating tool allowing virtual experimentation. Such a system may allow designers for: - improving final fiability of the components - predicting electrical behaviour and lifetime of the components depending on users solicitations - developing and optimizing new architectures of microbatteries. The STRESSBAT project aims at developing such an multi-physical and multi-materials expert tool based on a ambitious and specifically adapted experimental approach. The Marketing and Technological Road Map put the stress on the fact that the microbattery technology will face two main technological challenges: - resistance and compatibility with standard microelectronic packaging process (that imply temperature and pressure stresses) - realization of components on flexible substrates. The answer to these two challenges will be in the heart of the developments performed during the STRESSBAT project. The scientific challenge addressed in the STRESSBAT project is the understanding of the thermo-mechanical behaviour of multi-materials constituted by the stack of layers necessary to the realization of lithium microbatteries. To success, it is necessary to determine experimentally values of different parameters. These data are currently unknown since the materials used are not conventional and moreover they are elaborated as thin films. Innovative characterization technique will be used to obtain quantitative value with a high degree of confidence. Main expected results of the project are: - a model and expert tool allowing for a 3D and sequential description of thermomechanical and electrochemical aspects in multi-materials - optimized architectures and processes of microbatteries on rigid and flexible substrates - a feasibility analysis of a model integrating high coupling between thermo-mechanical and electrochemical modules. All the results obtained in the frame of the STRESSBAT project will reinforce the position of French actors on the microbattery market. Estimated market business is around 250 M’ in 2016.