Feng Weidong / Science and Technology Daily reported “Natural ¡¤ Materials” reported that in order to develop alternatives of lithium-based cells, reducing the dependence of rare metals, the US Georgia Institute of Technology has developed a new type of cathode and electrolyte system with prospects Replace expensive metals and conventional liquid electrolytes with low-cost transition metal fluorides and solid polymer electrolytes. The new cathode is made from fluorinated iron active materials and solid polymers (a plastic) electrolyte nanocomposite..
In order to manufacture this cathode, the researchers have developed a method of penetrating solid polymer electrolytes into prefabricated ferric iron electrodes, and then hot pressing the entire structure to add density and reduce voids.. The polymer-based electrolyte has two protruding advantages, one is that it is capable of bending and adapting to fluoride swelling during cycle, and the second is to form a very stable flexible interface with ferriation fluoride, and solve the use of fluorination in previous battery design.
Key issues such as expansion and large number of side effects of iron. Researchers tested several variants of new solid batteries to analyze their performance of more than 300 charging and discharge cycles at 50 ¡ã C..
As a result, it is found that the key to reinforcing battery performance is solid polymer electrolyte. When used with solid polymer electrolytes, even at high temperatures, metal fluoride also exhibits extraordinary stability..
This is expected to bring more secure, lighter and cheaper lithium-ion batteries. In addition, the lithium capacity of iron fluoride is more than twice the traditional cobalt or nickel cathode..
And iron is 300 times cheaper than cobalt, 150 times more cheaper than nickel.. In the future, researchers will continue to improve and develop new solid electrolytes to achieve rapid charging, combining solids and liquid electrolytes in new design, and is fully compatible with traditional battery manufacturing technology used in large battery pack.