Summary of Researchers Developed Low Cost Battery From Graphite Waste
Scientists from Empa and ETH Zürich are developing safe, efficient batteries using waste graphite and scrap metal. This design replaces lithium-ion technology by utilizing common Earth crust elements like aluminum and graphite. Unlike traditional lithium-ion batteries where graphite is the anode, this new system uses graphite as the cathode. The battery operates using a liquid electrolyte containing special ions that form a non-crystallizing "cold melt" at room temperature, allowing metal ions to move between electrodes encased in chloride ions.
Parts used in the New Battery Project:
- Waste graphite
- Scrap metal
- Aluminum
- Liquid electrolyte with special ions
- Chloride ions
- Cathode made of graphite
- Anode made of pure metal
Lithium-ion batteries are flammable and the price of the raw material is increasing. Scientists and engineers have been trying to find out a safe yet efficient alternative to the Lithium-ion technology. The researchers of Empa and ETH Zürich have discovered promising approaches as to how we might produce powerful batteries out of waste graphite and scrap metal.
Kostiantyn Kravchyk and Maksym Kovalenko, the two chief researchers of the Empa’s Laboratory for Thin Films and Photovoltaics, led the research group. Their ambitious goal is to make a battery out of the most common elements in the Earth’s crust – such as graphite or aluminum. These metals offer a high degree of safety, even if the anode is made of pure metal. This also enables the assembly of the batteries in a very simple and inexpensive way.
In typical lithium-ion battery design, the negative electrode or anode is made from graphite. This new design, however, uses graphite as the positive electrode or cathode. In order to make such batteries run, the liquid electrolyte needs to consist of special ions that form a kind of melt and do not crystallize at room temperature. The metal ions move back and forth between the cathode and the anode in this “cold melt”, encased in a thick covering of chloride ions.
Alternatively, large but lightweight and metal-free organic anions could be used. But, this raises some questions which cannot be solved easily – where are these “large” ions supposed to go when the battery is charged? What could be a suited cathode material? In comparison, the cathode of the lithium-ion battery is made of a metal oxide which can easily absorb the small lithium cations during charging. This does not work for such large organic ions.
Read more: Researchers Developed Low Cost Battery From Graphite Waste
- What materials are used to build the new battery?
The battery is built using waste graphite and scrap metal, specifically utilizing common elements like graphite and aluminum found in the Earth's crust. - How does the electrode design differ from lithium-ion batteries?
In this new design, graphite serves as the positive electrode or cathode, whereas it is typically the negative electrode or anode in standard lithium-ion batteries. - What type of electrolyte is required for these batteries?
The liquid electrolyte must consist of special ions that form a melt and do not crystallize at room temperature. - How do ions move within the battery during operation?
Metal ions move back and forth between the cathode and anode while encased in a thick covering of chloride ions within the cold melt. - Can large organic anions be used instead of metal ions?
Large organic anions could theoretically be used, but they raise unsolved questions regarding where these large ions go when the battery is charged. - Why can't large organic ions use a metal oxide cathode?
A metal oxide cathode works for small lithium cations but cannot easily absorb the large organic ions required for this alternative design. - What safety advantage does this new battery offer?
These metals offer a high degree of safety even if the anode is made of pure metal, addressing the flammability issues of lithium-ion batteries. - Is the assembly process for this battery complex?
No, the assembly of these batteries is described as very simple and inexpensive compared to current technologies.
