[Part 3] Comprehensive insights into solid-state battery development

jennyzhang

Material interface

Material interfaces are a key research area in solid-state batteries. The interface between the electrode and the solid electrolyte causes significant electrical resistance, the source of which is not fully understood. When the electrode surface is exposed to air, resistance increases, reducing battery capacity and performance. Despite multiple attempts to lower the resistance, I was unable to get it down to the same 10 Ω cm^2 as when not exposed to air. Tests showed that the decrease in resistance was due to the spontaneous removal of protons during the annealing process, rather than oxygen or nitrogen reducing cell performance. After one hour of thermal annealing at 150°C, the resistance dropped to 10.3 Ωcm^2, which is comparable to cells not exposed to air.

A major battery manufacturer has adopted a new lithium metal pouch battery design that emphasizes the importance of interfaces. The battery uses a silver-carbon (Ag-C) nanocomposite layer on the lithium metal negative electrode to prevent the growth of lithium dendrites and provide greater capacity, longer cycle life and higher safety. Although the battery combines a high-nickel layered aluminum oxide cathode and a solid sulfide electrolyte, the key is to use a hot isostatic pressing technique to improve the contact between the electrode and the electrolyte. This design allows the battery to be half the size of a lithium-ion battery while supporting a lifespan of more than 1,000 charge cycles.

Dave Angelini

When will it be sold in the store here at NAZ😉    A thousand charge cycles is not that great BTW.

JRHill

Jenny, in one of your earlier posts I asked about you using solar and you said that you didn't indulge - it was personal interest which stuck me as odd. But what the heck, thank you. I have some hobbies other people consider odd. In this post you state "I was unable to get it down to the same 10 Ω cm^2" which got my attention again. I still ponder why an individual would invest research time and now material and measuring resources, not to mention your well written write-ups, into something you don't personally use?

I certainly look forward to the future advances in storage technology and thank you for the solid state stuff you contribute. But I don't think I'll be buying a replacement bank in my life time. But I hope the technology matures.

jennyzhang

Solid-state batteries still have many technical problems that need to be solved and more professionals need to get involved.

jennyzhang

Hello JRHill,Technology needs innovation. I believe that maybe you will change your view in three years, maybe even shorter.