Dendrite formation in Li-metal batteries successfully tackled | batterymetals
Researchers at the Next-Generation Battery Research Center of Korea Electrotechnology Research Institute developed a 1D Li-confinable porous carbon structure with a hollow core, and a small number of gold nanoparticles with Li affinity inside the core, to be used inLi-metal batteries use metallic lithium instead of graphite as the anode, as it has a 10 times higher theoretical capacity than graphite .
A major challenge observed in the existing hollow core-shell Li host, however, was the Li deposition on the conductive carbon shell, not inside the core, under high-rate charging conditions. Seeing this, the KERI team introduced many nano-sized pores to the shell and achieved significantly improved coulombic efficiency without Li dendrite growth even under a high-current testing condition of 5 mA/cm2.
Simulation results showed that the reduced Li-ion diffusion length by the shell pores and improved Li affinity by the gold nanoparticles kept lithium deposition inside the structure even under high-current charging conditions., the researchers also point out that the designed Li host showed excellent cycling performance of over 500 cycles under a high current density of 4C rate .
“Despite the merit of high capacity, the Li-metal batteries have many hurdles to be overcome for commercialization mainly due to stability and safety issues,” lead scientist Byung Gon Kim said in a media statement. “Our study is invaluable in that we developed a technique for mass production of Li-metal reservoir with high coulombic efficiency for fast-rechargeable Li-metal batteries.”
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