While half the world seeks more lithium, some researchers from China have eliminated it from the equation: batteries with bacteria

The shortage of critical resources such as lithium and cobalt has been being a warningsince they are essential for the manufacture of batteries. However, a group of Chinese engineers have found a solution that does not require mining or polluting processes: it only needs bacteria.

The study. Researchers from the Shenzhen Advanced Technology They have developed A battery that works with live bacteria. These microorganisms are electroactive, that is, they produce electricity. So the system uses hydrogels that contain living bacteria To conduct electricity and generate it, in addition within the soft material they are protected.

Tangible applications Biobatería has a small size and ability to generate energy autonomously, ideal for integrating into portable devices, especially in the medical field. One of its most promising uses is the precise control of physiological functions such as blood pressure, by directed bioelectric stimulation. In this way, a door opens to new forms of physiotherapy, real -time monitoring and devices that do not require frequent recharge or toxic materials.

More technical. Biobatería generates electricity thanks to the activity of bacteria such as Shewanella Oneidensis MR-1, which are contained in a alginate-based gel. The material It can be molded With 3D printers, which allows to design it. Its size of 20 mm in diameter and 3.2 mm high contains: a gel with bacteria that acts as an anode, another gel with a chemical that acts as a cathode, and a special membrane that allows the passage of ions between them.

Replaces lithium? Its specific capacity (0.4 mAh/g) and energy density (0.008 WH/L) are lower than those of lithium -ion batteries, this biobatría offers a more sustainable alternative: it does not use critical materials or toxic components. In addition, it maintains a bacterial viability of 70 % during its operation and reaches 97.6 % at the end, which speaks of remarkable stability and efficiency.

Forecasts Biobaterías are still far from reaching lithium in capacity or energy density. But what they lose potentially, compensate for it with other virtues: they are recharged alone, they are highly efficient and, above all, biocompatible. These qualities make them especially suitable for very specific uses, such as nerve stimulation, control of physiological functions or the operation of bioportile devices.

Image | Unspash and Pacific Northwest National Laboratory – PNNL

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