Researchers at The Samsung Technology Research Institute (SAIT) and Japan’s Samsung Research and Development Research Institute (SRJ) have designed a high-performance, long-life, solid-state EV prototype battery. It features a safer bag package design that is 50% smaller than conventional lithium-ion batteries and delivers more than 1,000 cycle strains with 500 miles of range.
Screenshot (from: Samsung)
Solid-state batteries are seen as an important breakthrough for electric vehicles (EVs) and are expected to lay the groundwork for the next few decades, playing an important role in automobiles, aircraft, equipment, home power supply, etc.
One of the current lithium-ion slabs is the use of liquid electrolytes. Each time the charge and discharge process, the lithium ions float back and forth between the positive and negative poles, while the solid-state battery uses a condensed solid electrolyte to transmit the charge.
Eliminating liquid electrolytes not only increases the volume of the battery’s energy density, makes the structure more compact, but also better copes with heating conditions.
For electric vehicles, solid-state batteries not only reduce cooling requirements, but also reduce self-weight, are less prone to fire or explosion, and last longer.
At present, lithium-ion batteries also face the problem of aging after the formation of branches, with the common lithium metal anode accumulation of a small amount of metal, the inside of the battery may form a shoot-like protrusion, and eventually puncture the cell, shorten the battery life, and even form a short circuit and other safety hazards.
The good news is that researchers at Samsung’s SAIT and SRJ institutes have developed a way to replace lithium metal anodes with a 5 micron-thick silver-carbon composite layer.
The study was published in the journal Nature Energy
Aihara Yuichi, SRJ’s chief engineer, Lee Yong-Gun Lee, and SAIT’s Master Dong Im, selected solid sulphide electrolytes and high-nickel-layered oxide cathodes.
It is found that the new design effectively regulates the deposition of lithium crystals, thus realizing the long-lasting electrochemical properties. Tests based on the bag prototype battery have shown an efficiency of 900 Wh /L or more.
The energy density of the prototype battery is about twice that of a lithium-ion battery that routinely uses liquid electrolytes, more than 99.8% of coulomb efficiency, and an estimated life of more than 1000 cycles.
In the case of an electric car designed to last 500 miles (800 kilometers), if properly managed, the car can travel more than 500,000 miles (800,000 kilometers) well, far more than most fuel engines.
As one of the world’s leading battery manufacturers, Samsung is clearly able to quickly launch the next generation of solid-state EV batteries in due course.
But before it was commercially available, the research team said it planned to further refine the design and develop the manufacturing technology, which still accounts for the bulk of the total cost of the EV.