▲ Papers published by Samsung researchers in Nature and Energy.
At present, most of the anodes used in solid-state batteries contain metallic lithium, and the lithium inside the battery will appear dendritic crystals with the continuous aging of the battery, which will affect the battery life and even cause safety hazards. Silver and carbon are relatively stable, so their service life is longer. However, this technology has only been verified in the laboratory at present, and there is still a long way to go to achieve mass production.
1. Samsung develops cathode composite materials for silver-carbon solid-state batteries? The energy density reaches 900 wh/L.
Recently, researchers from Samsung Institute of Advanced Technology (SAIT) in London and Samsung R&D Center (SRJ) in Japan published an article in the authoritative journal Nature and Energy, entitled "High Energy? Riding a bike for a long time? All solid state? Lithium? Metal? Batteries? Enable? By who? Silver-carbon? Get back together? Anode.
▲ The main author of the paper. From left to right: Chief Engineer Xiongyi of SRJ? Xiang Yuan and SAIT Principal Researcher Yong Jun? Li and Dong Min, head of SAIT Company? Imported?
It is pointed out that if the anode of soft-packed solid-state battery adopts silver-carbon composite material, the life, energy density and safety of the battery will be greatly improved.
Samsung researchers used a layer of silver-carbon composite with a thickness of 5 microns as the anode of a flexible battery, which can effectively prevent dendrite aging in lithium-ion batteries. At the same time, the energy density of the battery has also increased to 900 Wh/L. Under the same battery capacity, the battery with silver-carbon anode is 50% smaller than the traditional lithium-ion battery.
If this technology is applied to electric vehicles, the endurance of pure electric vehicles can reach 800 kilometers, and the number of battery cycles can also reach 1000. In other words, the life of the battery can reach 800,000 kilometers.
Dong Min, Head of Battery Laboratory of Samsung Advanced Technology Research Institute? Im said: "Samsung's research can be used to manufacture safer and higher performance power batteries in the future."
2. Dendritic crystals produced by traditional anode aging? Silver-carbon composites can solve this problem perfectly.
Lithium-ion batteries commonly used in life all contain electrolyte components. Different electrolytes can be liquid and solid at room temperature. The electrolyte of solid-state battery is solid, which has the advantages of high energy density and high safety.
However, in the process of charging, the negative electrode containing lithium metal is easy to deposit. These deposits are tree-shaped under the microscope, and these tree-shaped crystals will slowly cover the surface of the negative electrode of the battery, which will lead to the underutilization of the negative electrode of the battery and affect the battery life.
▲ Residual root crystal of battery positive electrode under microscope.
If the number of anode dendrites continues to increase, it may corrode the separator between the positive and negative electrodes and affect the safety of the battery.
That is to say, at present, the solid-state battery uses lithium-containing metal as the negative electrode material, and the life and safety of the battery are reduced to some extent.
Samsung researchers use silver-carbon composites to make solid-state battery anodes. Because silver and carbon are relatively stable, their properties are difficult to change, so the problem of dendrite can be solved.
Conclusion: Samsung's new solid-state battery technology is still far from the market.
As one of the top consumer electronics manufacturers in the world, Samsung's R&D capability is naturally strong. The energy density of Samsung's trial-produced solid-state batteries has been greatly improved, which will be used to manufacture solid-state batteries or help electric vehicles to fight a "turnaround".
However, because this technology is still in the experimental stage, there is still a certain distance from the real market. Today, major battery manufacturers around the world are working hard to develop new battery technologies, and it is believed that more new battery technologies will enter people's lives.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.