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Institute Electrochemical Energy Storage

OpMetBat (EU)

Operando Metrology for Energy Storage Materials in Batteries

The development of new battery materials is key to improving the performance, lifetime, safety and cost of energy storage technologies like Li-ion and Li-S batteries. However, industry innovation is limited by constraints to reliably characterize structure and chemistry in an operating environment. 

The “OpMetBat” project (“Operando-Metrology for Battery Materials/ Energy Storage Materials“), is partly funded by the European Partnership on Metrology (EURAMET) participating states and from the European Union’s Horizon 2020 research and innovation programme. This European joint project aims to develop operando techniques and hybrid (multi-modal) instrumentation, supported by quantitative and validated ex situ analysis and electrochemical measurements methods, to enable beyond state-of-the-art materials characterization for high-capacity energy storage technologies.  Besides our group at HZB, several european institutions are forming the consortium.  

Part of this project focused on establishing a metrological framework to support traceable operando characterization of state-of-the-art battery materials under dynamic charge / discharge conditions. This includes advancement and validation of ex-situ methods, establishing new protocols, cells and a best practice guide for operando approaches and developing new instrumentation enabling hybrid, multiparameter measurement to inform new materials development.  

For instance, the development of operando cells containing coin-cell materials enables not only operando characterization during the cycling of batteries, but also multi-modal analysis combining electrochemical characterization with other spectroscopy techniques. Thus, operando electrochemical measurements like Electrochemical Impedance Spectroscopy (EIS), could be measured simultaneously with spectroscopy techniques like Near-Edge X-ray Absorption Fine Structure (NEXAFS). Another possibility is the integration of multiple techniques such as EIS, Raman and UV/Vis absorption spectroscopy.

More Information at project website (Link)

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Standardized operando cell with interchaneable windows allows for a wide variety of application cases.