Generally speaking, it takes about 10 hours to charge an electric car. Even with fast charging technology, you'll still need at least 30 minutes. If electric vehicles could be "recharged" as quickly as traditional gasoline vehicles, the shortage of electric vehicle charging stations would be alleviated.
It is understood that the efficiency of lithium-ion batteries depends on the ability of the anode material to store lithium ions. Recently, a research team at Pohang University of Science and Technology (POSTECH) in South Korea developed a new anode material and made a breakthrough. The latest research results have been recently published in the journal Advanced Functional Materials.
It is reported that they used a novel self-mixing method to synthesize manganese ferrite nanosheets with a large surface area through a simple displacement reaction process. This new material can store more lithium ions, breaking through its theoretical limits.
In this study, the research team designed a new method to synthesize manganese ferrite nanosheets, a material that has both excellent lithium ion energy storage capabilities and good ferromagnetic properties. Researchers say this breakthrough technology increases storage capacity to about 1.5 times the theoretical limit and enables electric vehicles to be fully charged in six minutes.
Specifically, they first performed a displacement reaction in a solution that mixed manganese oxide and iron, forming a heterostructure compound with manganese oxide on the inside and iron oxide on the outside. The team then used a hydrothermal method to prepare manganese ferrite nanosheets with a thickness of only nanometers. This approach takes advantage of highly spin-polarized electrons, significantly improving the ability to store large amounts of lithium ions.
In this study, the research team designed a new method to synthesize manganese ferrite as an anode material, known for its superior lithium ion storage capacity and ferromagnetism. First, an electro-substitution reaction occurs in a mixed solution of manganese oxide and iron, generating a heterostructure compound with manganese oxide inside and iron oxide outside.
This innovation allows the team to effectively exceed the theoretical capacity of manganese ferrite anode materials by more than 50%. Expanding the surface area of the anode material facilitates the simultaneous movement of a large number of lithium ions, thereby increasing the charging speed of the battery. Experimental results show that it only takes 6 minutes to fully charge a battery with a capacity equivalent to that of electric vehicles currently on the market.
The researchers said that this research simplifies the complex process of preparing anode materials and has made breakthrough progress in increasing battery capacity and speeding up charging.
"The rational design of using electron spin to change the surface to overcome the electrochemical limitations of traditional anode materials and improve battery capacity is a new understanding. This development may improve battery durability and shorten the charging time of electric vehicles." They said.