Lithium-ion batteries have a lot of convenience as the main energy storage methods for today's electric vehicles, but many problems of their own have caused lithium-ion batteries to suffer. Therefore, there is a need for a material that can improve or replace lithium batteries to protect the future of electric vehicles.
Graphene, an emerging but not familiar material. It is widely used as "universal material." It has been reported that Graphenano of Spain cooperated with the University of Corvard in Spain to develop the first graphene polymer battery. The electric vehicle using this battery as a power source can travel up to 1,000 kilometers, and its charging time is less than 8 minutes. And Elton Keynes, a chemical engineer at the Berkeley-Lawrence National Laboratory in the United States, designed a coin-sized battery that uses readily available materials such as lithium, sulfur, and graphene oxide. The stored power is traditional. 2 to 5 times. In addition, Keynes and his R&D team conducted 1500 charge and discharge tests and confirmed that this battery only lost less than half of its storage capacity, which is the level that the best lithium batteries can reach.
Therefore, the prospect of graphene is very advantageous. Many countries have also established their own R&D centers for graphene. The European Commission will use graphene as a “future emerging flagship technology project†and set up a special R&D program that will be allocated within the next 10 years. €1 billion in funding. The British government has also invested in the establishment of the National Graphene Institute (NGI) in an effort to make this material accessible from the laboratory into the production line and market in the coming decades.
After saying graphene, let's look at another material super capacitor
As the name implies, a supercapacitor is a type of energy storage material. It forms an electric double layer on the interface between the electrode material and the electrolyte, or a rapid redox reaction on the surface of the electrode to store electric energy, which can release a large amount of energy during the charging and discharging process. The power is only one tenth of the ordinary capacitor. Compared with the chemical change lithium battery charge and discharge process, the super capacitor can be quickly and quickly put, do not worry about damage to the battery, but the super capacitor can not store much electricity, so the super capacitor can not be used as a power supply device alone.
Supercapacitors can be classified into three types: quasi-capacitors, hybrid supercapacitors, and double-layer capacitors. Double-layer capacitors, positive and negative electrodes use super-high specific surface activated carbon, commonly known as capacitor carbon. Quasi-capacitors, metal oxides, conductive polymers for the electrode material. Among them, the organic dielectric capacitors of carbon positive and negative electrodes in electric double layer capacitors are most commonly used in current electric vehicles. Among them, C/C inorganic system and C/C organic system are the first choice for electric vehicle applications because of their voltage of 2.7V, specific energy of 3~6Wh/kg, specific power of 3~12kW/kg and cycle life of 106 times.
However, Peter Harrop, chairman of IDTechEx, a technology industry consultancy from the University of Cambridge in the United Kingdom, said that a new form of electrical storage device combines the advantages of supercapacitors with lithium batteries and can be charged with the heat of the car's engine. It will be the ideal choice for future cars. He introduced: "The supercab batteries have the characteristics of a battery and a super capacitor, usually between the two; the power storage device has a lead-acid battery or a nickel battery. The basic version, and the market is mainly concerned with the use of lithium ion electrodes and supercapacitor electrodes;" Harrop pointed out: "The asymmetric electrochemical double layer capacitors (EDLC) are also known as lithium. Ion capacitors have the potential to replace automotive lithium-ion batteries and supercapacitors because they have faster charge and discharge speeds and other superior characteristics."
Now that the preparation of graphene is very difficult, the current development is still somewhat slow, but it will surely become widespread as future technologies improve, and supercapacitor cells are gaining favor among global forward-looking automotive manufacturers, including BMW. Well-known brands, such as good and bad, we have yet to observe.
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