10x capacity, so why not silicon or lithium metal?

追加: 2026-06-01

[00:00:00]Cathode comes in all flavors, NCM, LCO, LFP But why is the anode still mostly graphite?

[00:00:06]Silicon and lithium metal have 10x the capacity. So what gives?

[00:00:10]It’s simple.

[00:00:11]Graphite is the most stable way to store lithium.

[00:00:13]It packs lithium between thin layers of carbon.

[00:00:17]6 carbons for one lithium.

[00:00:18]Capacity is low but it’s very stable.

[00:00:20]Now looks at silicon. One atom bonds with four lithiums.

[00:00:23]Theoretical capacity hits up to 3000 to 4000mA/g.

[00:00:26]But as lithium fills in it swells by three times.

[00:00:29]Repeated cycles cause cracks in the electrode shortening its life.

[00:00:32]Then there’s lithium metal.

[00:00:34]The electrode itself is made of lithium metal.

[00:00:35]Unlike graphite, no extra space is needed to store lithium.

[00:00:37]The capacity is 10 times that of graphite.

[00:00:39]But dendrites form and cause short circuit risks.

[00:00:42]In the end, the potential is huge.

[00:00:44]Silicon faces swelling.

[00:00:45]Dendrite is the biggest challange for lithium metal.

[00:00:47]That’s why graphite is still the basic anode.

[00:00:50]Samsung SDI is mixing the strengths of graphite and silicon, use gel electrolyte to stabilize the lithium metal and advance anode technology.