Several two dimensional (2D) materials are claimed to have been developed by scientists that might offer a range of up to 800 km to electric vehicles on a single charge. Lithium-air batteries that are currently in the experimental stages of development have the ability to store 10 times more energy than currently used lithium-ion batteries, and they are much lighter, said researchers from the University of Illinois at Chicago (UIC) in the US. Lithium-air batteries could be even more efficient and provide more charge with the incorporation of advanced catalysts made from two-dimensional materials, they said. Catalysts help increase the rate of chemical reactions inside batteries, and depending on the type of material from which the catalyst is made, they can help significantly boost the ability of the battery to hold and provide energy.
In the research published in the journal Advanced Materials, Salehi-Khojin and his colleagues synthesized several 2D materials that can serve as catalysts. A number of their 2D materials, when incorporated into experimental lithium-air batteries as the catalyst, enabled the battery to hold up to 10 times more energy than lithium-air batteries containing traditional catalysts. The researchers synthesized 15 different types of 2D transition metal dichalcogenides or TMDCs. TMDCs are unique compounds because they have high electronic conductivity and fast electron transfer that can be used to participate in reactions with other materials, such as the reactions that take place inside batteries during charging and discharging.
The researchers experimentally studied the performance of 15 TMDCs as catalysts in an electrochemical system mimicking a lithium-air battery. Leily Majidi, a graduate student at UIC said that in their 2D form, these TMDCs have much better electronic properties and greater reactive surface area to participate in electrochemical reactions within a battery while their structure remains stable. He also said that the reaction rates are much higher with these materials compared to conventional catalysts used such as gold or platinum. One of the reasons the 2D TDMCs performed so well is because they help speed both charging and discharging reactions occurring in lithium-air batteries. The 2D materials also synergize with the electrolyte, the material through which ions move during charge and discharge.