Battery Technology Reference · Lithium anode · Last reviewed 2026-09-18
Graphite is stacked sheets of carbon. During charge, lithium ions slip between the sheets — a process called intercalation — and settle at one lithium per six carbon atoms (LiC₆), which is where the ~372 mAh/g limit comes from. The ions go in and out without the anode breaking apart, which is why graphite cells survive thousands of cycles.
| Natural graphite | Synthetic graphite | |
|---|---|---|
| Source | Mined, purified | Made from petroleum coke at high temperature |
| Cost | Lower | Higher |
| Consistency | More variable | More uniform |
| Typical use | Energy cells | Power and high-end cells |
Two challengers push at graphite's limits. Silicon stores roughly ten times the lithium per gram (raising energy density) but swells dramatically on charge, so it is used as a small additive to graphite rather than a replacement — see silicon anode batteries. LTO (lithium titanate) replaces graphite entirely for ultra-fast charge and extreme cycle life, at the cost of lower voltage and energy density. Graphite remains the default because its whole package — cost, stability, life — is still hard to beat.
My take: Graphite is the invisible workhorse of the lithium age — everyone compares cathodes, but the anode that made lithium-ion possible is the same cheap, stable carbon in almost every cell.
Why: The cathode sets the voltage and the headline; the anode sets the durability and fast-charge ceiling. Graphite's ~372 mAh/g is a hard limit that the whole silicon race is trying to lift — which is exactly why the anode is now the more active frontier than the cathode.
My view as an editor, not a purchasing guarantee.
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