Electric vehicles are the future trend, and battery technology is limiting their development and promotion. In October, a number of scientific research results were released at home and abroad. The OFweek network compiled the top ten scientific research results and shared them with everyone.
1. Korean scientists develop new storage technology charging 100 times faster than lithium batteries
On October 10, the Korea Science, ICT, and Future Planning Department announced that a team of scientists has successfully developed a new hybrid energy storage technology that charges much faster than conventional batteries.
According to reports, the team of scientists has developed a porous nanotube that has excellent mesoporous channels that allow positive and negative ions to pass through, and the research team combines the advantages of new materials with the advantages of lithium batteries and supercapacitors. . The new hybrid energy storage technology allows the battery to achieve an energy density of 275Wh/kg, which is 1.5 times that of a lithium battery. The charging and output power is 23kw/kg, which is 100 times faster than a lithium battery.
2. Chinese Academy of Sciences developed high performance graphene lithium battery materials
Liu Jinhuai and associate researcher Liu Jinyun of the Institute of Intelligent Machinery of Hefei Institute of Material Science, Chinese Academy of Sciences, etc., have made new achievements in the development of high-performance graphene lithium-ion batteries, and developed three-dimensional graphene nanocomposite lithium ions with high capacity and long life. Battery material. The research results were published in the international journal Advanced Materials and were selected as the first paper.
It is reported that the cathode material of the three-dimensional graphene/vanadium pentoxide battery developed under the full charge/discharge condition of 12 minutes has a battery capacity of more than 200 mAh/g after 2000 cycles (a large number of reports reported less than 1000 times, and the capacity is generally lower than 150). mAh/g); and the capacity of 1 minute charge reached a commercial and reported similar capacity of more than 5 minutes. In addition, the three-dimensional graphene composite battery material structure design can also be applied to lithium ion battery anode materials, such as the development of graphene/silicon composite anode, showing good versatility.
3. German Institute released new super capacitor material
The Leibniz Institute for New Materials (INM) has released a new supercapacitor material that claims to remain charged for longer without automatic discharge.
Conventional capacitors are constructed of dielectric plates separated by insulating materials, and supercapacitors are mostly made of ionic liquid electrolyte materials for operation at higher voltages. The Leibniz Institute of New Materials research team uses a mixture of potassium ferricyanide and liquid media with an energy density of 28.3 watt-hours per kilogram by weight, 11.4 watts per liter by volume - hour.
At present, the upper limit of the supercapacitor energy density is about 30 watt-hour. The results of the Leibniz Institute of New Materials Research Group are quite close to the upper limit and higher than the supercapacitor of liquid sodium sulphate. The research team also said that the material can remain stable after 10,000 charge and discharge cycles, and that it will have a place in the future energy storage market.
The research team said that potassium ferricyanide redox materials provide higher energy density and higher power output. Another important key is the use of ion-selective ion exchange membranes to prevent current leakage and reduce the loss of electricity caused by automatic discharge. The phenomenon can thus remain in the charged state for a longer period of time without being easily discharged automatically. The research team believes that when using supercapacitors, it is always desirable to maintain the state of charge as long as possible, and do not want automatic discharge to cause power loss.
4.MIT discovered a new conductive sponge-like MOF material
MIT first discovered metal-organic frameworks with conductive metal-organic frameworks. The new MOF material with spongy microstructure has a very high energy storage density and is expected to become a new generation of supercapacitors. / The core material of battery technology. It can replace the current supercapacitor based on carbon nanotube materials. The preparation conditions of carbon nanotube materials are very strict and costly.
The research papers have been published in the journal Nature Materials.
5. The Netherlands develops new lithium battery technology: using pure silicon anode battery capacity increased by 50%
The Energy Research Centre of the Netherlands (ECN) has developed a new lithium battery energy storage technology that is said to increase the storage capacity of rechargeable batteries by 50%.
The technology uses a pure silicon anode instead of the graphite anode traditionally used in lithium-ion batteries, which increases the component storage capacity of lithium-ion batteries by a factor of 10 and increases the storage capacity of the entire battery by 50%. However, the problem with using silicon crystals is that the battery expands as it is charged, causing the size of the assembly to increase by a factor of three, which may cause the silicon layer to become brittle and cause the battery material to chip.
ECN uses plasma-based sodium technology to align silicon pillars on copper foil to create enough space for possible expansion to keep the battery stable.
6. High performance graphite anode material: hollow carbon microspheres
Recently, Xinyang Yue et al. of Beijing Institute of Technology developed a microporous-mesoporous hollow carbon microsphere lithium ion battery anode material based on mesoporous carbon technology. The specific surface area of ​​the material is up to 396 m2/g, and the material not only has high capacity characteristics. And with good cycle performance, at a current density of 2.5 A / g, the specific capacity of 530 mAh / g is still maintained after 1000 cycles. The rate performance of the material is also very shocking. At a current density of 60 A/g (approximately 100 C), the specific capacity of the material is still up to 180 mAh/g.
At present, the problem of the material ** is that the preparation cost is too high, the tap density is low, and it is difficult to commercialize, and the problem that the first irreversible capacity of the material is too high can be solved by a technique such as lithium supplementation by a negative electrode. At present, the method is still only at the laboratory level, and further research is needed to reduce costs and improve the performance of materials.
7. German car battery is expected to be put into production to challenge the power lithium battery?
According to the US media on October 21st, the flow battery technology developed by the German startup Nano Flowcell is likely to be put into production. The Quantino is equipped with 4 in-wheel engines and has a power of 109 hp. According to reports, the car can accelerate from 0 to 100 km / h in 5 seconds. The company is currently testing two prototypes and is already registered in Germany.
8. Doped carbon nanotubes, the new lithium battery can heal itself after being damaged.
According to reports, the researchers developed a new type of lithium-ion battery that can quickly "regenerate" even after damage, and restore external power. According to a paper published in Angewandte Chemie, a new generation of batteries utilizes a series of polymer-coated carbon nanotube sheets that not only prevent leakage when the battery is damaged, but also allow the "wound surface" to heal itself.
Researchers believe that self-healing batteries can be used in wearable devices -- especially wearable devices that can sometimes be damaged. The new battery is still in the experimental phase, so it will take a while to apply to a wearable device such as a Fitbit fitness bracelet or Apple Watch.
9. High capacity lithium battery cathode material: multi-shell metal oxide
At present, a major problem facing the development of lithium-ion batteries is that the capacity of cathode materials is generally low compared to anode materials. V2O5 is widely regarded as a promising cathode material for lithium ion batteries due to its high theoretical capacity.
Recently, Professor Wang Dan of the University of Chinese Academy of Sciences reported a hollow multi-shell V2O5 microsphere prepared based on the metal anion adsorption mechanism using carbon microspheres as a template. The researchers prepared a series of different structures of V2O5 hollow microspheres by controlling the five different parameters of precursor concentration, adsorption temperature, adsorption time, solvent and heat treatment process. Although different methods may obtain similar structures, such as multi-cavity. Hollow microspheres and double-shell V2O5 hollow microspheres, but the three-shell V2O5 hollow microspheres prepared by different methods are different.
Subsequently, the researchers performed the electrochemical performance of the three-shell V2O5 hollow microspheres as the positive electrode of the lithium ion battery. It was found that the multi-shell V2O5 hollow microspheres had the first specific capacity up to 1000 mA g-1. 447.9 mAhg-1, and after 100 cycles, the specific capacity was maintained at 402.4 mAh g-1. Significantly higher than other V2O5 hollow structures.
The multi-shell metal oxide hollow microsphere positive electrode material significantly reduces the gap between the positive and negative materials, and opens up a new channel for the development of next-generation lithium-ion batteries. Relevant research results are published online in the well-known journal Nature Energy.
10. Imperial College London has developed a wireless power supply technology for drones: replacing batteries with coils
Most multi-axis drones based on airborne batteries typically have a battery life of more than 30 minutes after a single charge, which greatly limits their capabilities. However, scientists at Imperial College London have developed a new drone that does not require batteries and power cables because it can wirelessly capture the energy needed to fly in the air.
Imperial College says it is the first time they have provided wireless energy to a flying drone. Although it is currently only applicable to a distance of 10CM (3.9 inches), it is expected to greatly expand its application range in the future.
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