My project is how to create fully solid–state batteries and accumulators exclusively from natural materials. Glasses and gloves are not needed to make a battery, the technology is completely harmless, simple and cheap. We will do without acids, alkalis and harmful metals, which, like lithium, are sometimes flammable. The components are available: ordinary marine pumice stone, from which we will make a solid porous electrolyte. The porous material has a large surface area and as the larger the electrode area, as the higher the current density, and therefore the battery power. In this design, the porous material does not require special manufacturing – it is a natural porous material – marine pumice stone. The new technology is completely exclusive and has no analogues. The ease of manufacture and cheapness have allowed me and my students to use this battery for more than a year. I'm in charge of the patent. For accumulators of my own manufacture, I also use simple natural superionic materials as electrolytes that I have found. Batteries can be recharged simply from mini solar cells, which are sold inexpensively at any radio parts store. I will tell you here about the technology
of manufacturing a pumice stone battery. The steps are:

1. We cut the pumice stone into rectangular or oval plates.
2. The sliced pieces are soaked in a saturated solution of a mixture of salt and soda (you can boil in a mug for a few minutes) and dry.
3. On the surface of the treated pieces of pumice, we apply a conductive layer – it can be silvering, or it can be a graphene layer - i.e. the most ordinary simple pencil or a good layer of candle soot.
4. The current in any battery is primarily a chemical reaction, and a chemical reaction needs a catalyst. It can be a drop of iodine or a drop of ammonia. We connect a small fragment of pumice stone with a piece of activated carbon (you can buy it at any pharmacy) - here is a 0.5 volt voltage source element ready. To obtain higher values, press the galvanized plate on the opposite side and get a voltage of 1.5-1.9 Volts.
5. Connect the received elements into a battery, make a case out of a sheet of paper. We will remove the electrodes separately and be sure to fill them with a molten candle – to preserve the carbon electrode and secure the structure.
6. Advantages: super cheapness, ease of manufacture, in moments of emergency power outages for home lighting, recharging a computer or Wi-Fi, phone, starting a mini fan - a battery is always at hand, which can be built in a matter of minutes. It does not contain harmful substances.

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