Samsung presents all-solid-state battery technology study
Researchers from the Samsung Advanced Institute of Technology (SAIT) and the Samsung R&D Institute Japan (SRJ) presented a study on high-performance, long-lasting, all-solid-state batteries to the scientific journal Nature Energy.
Compared to widely used lithium-ion batteries, which utilize liquid electrolytes, all-solid-state batteries support greater energy density, which opens the door for larger capacities, and utilize solid electrolytes, which are demonstrably safer. However, according to the team, the lithium metal anodes that are frequently used in all-solid-state batteries are prone to trigger the growth of dendrites (needle-like crystals that can develop on the anode of a battery during charging), which can produce undesirable side effects that reduce a battery’s lifespan and safety.
To overcome those effects, Samsung’s researchers proposed utilizing, for the first time, a silver-carbon (Ag-C) composite layer as the anode. The team found that incorporating an Ag-C layer into a prototype pouch cell enabled the battery to support a larger capacity, a longer cycle life, and enhanced its overall safety. Measuring just 5 µm (micrometers) thick, the ultrathin Ag-C nanocomposite layer allowed the team to reduce anode thickness and increase energy density up to 900 Wh/L. It also enabled the team to make its prototype approximately 50% smaller by volume than a conventional lithium-ion battery.
This research is expected to help drive the expansion of electric vehicles (EVs). The prototype pouch cell that the team developed would enable an EV to travel up to 800 km (487 mi) on a single charge, and it features a cycle life of more than 1000 charges.
“The product of this study could be a seed technology for safer, high-performance batteries of the future,” said Dongmin Im, Master at SAIT’s Next Generation Battery Lab and the Leader of the project. “Going forward, we will continue to develop and refine all-solid-state battery materials and manufacturing technologies to help take EV battery innovation to the next level.”