A group of researchers at the University of Cordoba (UCO) and the University of Malaga (UMA) has developed a battery that could store transparent and regulate the incident solar energy in the windows or translucent surface.

The development of the battery has been entrusted to the UCO while UMA was responsible for its integration with a transparent photovoltaic system and the preparation of electrodes. Professors Luis Sánchez Granados (UCO) and Francisco Martin (UMA) conducted research that led to the filing of a patent.

The battery and its integration

This is a sandwich-type battery-operated thin film lithium ion and a solid polymer electrolyte, which is transparent to the visible spectrum of light. This surprising property is of particular interest to transform any glass surface into a reserve of electrical power available on demand. The design of the battery also gives it a low thermal emissivity (also known as the “low-e”), a distinct advantage in regulating the heat flow required for frames to ensure the comfort of the occupants of the house , car etc.. Finally, the materials that constitute the manufacturing process and enable its industrialization at a reasonable cost.

The other advantage of such a battery would be its integration into photovoltaic cells transparent, to provide a complete system conversion and storage of incoming solar energy into electricity. As a sandwich, the outer equipped cell would act as receiver and converter, while inside the battery stores the energy produced. This integration is still under development at the University of Malaga.


The transparency of the intended course in the construction industry, to exploit the potential of glass surfaces in terms of efficiency and energy sufficiency. In this sense, the fact that the battery can be fabricated directly on transparent surfaces such as glass or polymers is a step closer to rapid industrialization and many companies have already shown their interest in the product. The automotive industry, a major consumer of translucent surfaces, is also a potential target.

Researchers from Cordoba and Malaga do not want to stop there way and have devised systems that go even further integration, such as a device gradual darkening of the glass depending on the conditions of sunshine or adding an LED curtain for exterior lighting, fueled of course in situ by the window itself …

Finally, a miniaturization of the concept would allow development on smaller areas, including mobile electronic devices such as smartphones, laptops and other portable digital players.

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