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Versatile Ionomers for DIvalent CAlcium baTteries

Periodic Reporting for period 1 - VIDICAT (Versatile Ionomers for DIvalent CAlcium baTteries)

Reporting period: 2019-03-01 to 2020-02-29

The growth of renewable energy hinges on the development of new energy storage instruments. Lithium batteries (LiB), a reliable solution, are used today in electronic instruments, electric vehicles and stationary storage plants. But in future, the growing storage demand will conflict with the issue of limited resources. Post-LiB solutions such as sodium, magnesium or calcium technologies have emerged. They present high potential in terms of theoretical density, safety and sustainability. However, the absence of trustworthy electrolytes hinders practical research on rechargeable calcium batteries. The EU-funded VIDICAT project intends to develop a new material concept based on nanocomposite ionomers that will offer highly stable electrolytes. The project will also search for positive electrodes in its work towards building trustworthy and safe calcium batteries.
The works performed since March, 15, 2019, beginning of VIDICAT, are essential steps to promptly move to an innovative electrolyte allowing a rechargeable and sustainable calcium battery to compete with current Li-ion batteries. Several innovative materials still non fully optimized have been invented during this 1st year.
The obtained results demonstrate that several calcium salts can dissolve in solvating polymers, at higher salt concentration than in usual liquid solvents. The calcium salts to be dissolved have a high chemical/electrochemical stability and the resulting polymer electrolytes exhibit a high thermal stability. The results obtained in terms of polymers and monomers pave the way to versatile ionomers which can be used not only in calcium battery but also in a variety of lithium and post-lithium battery, such as magnesium, sodium or potassium batteries. The objective of VIDICAT is to build a sustainable calcium battery with practical specific energy exceeding 250 Wh/kg. Such calcium battery should provide to European Union an independency, indispensable in the frame of a massive development of electric vehicle fleets and of renewable electricity.