Silicon nanowire battery anodes
Instead of graphite, the anode in Amprius's batteries is close to pure silicon grown as a dense forest of nanowires, more than a million per square centimeter. The thin wires give the silicon room to swell without breaking.
Amprius annual report (10-K), 2025How far from your life: You can get it now, though it may not be common yet.
Company-reportedFrom lab to your life
Why it’s on step 4
- 1Lab discovery
- 2Working prototype
- 3Real-world testing
- 4Approved or on sale
- 5Everyday life
The rule
A regulator approved or cleared it where approval applies (the FDA, the EMA, a CE mark), or it is sold to the public or to customers beyond a trial.
- Amprius reported shipping batteries to hundreds of customers during 2025, mostly for drones and other aircraft. Amprius annual report (10-K), 2025
The short version
What you need to know
- Why it matters
More energy for the weight means longer flights for drones and high-altitude aircraft.
Amprius annual report (10-K), 2025- Is it really nano?
Truly nano
The anode is the nanowires: their shape is what lets nearly pure silicon work.
Amprius annual report (10-K), 2025- Where you’ll find it
Mostly in drones and high-altitude aircraft.
Amprius annual report (10-K), 2025- Who’s behind it
Amprius Technologies
On the record
Every step, dated
Newest first. Company-reported means the only source so far is the company itself.
- On saleCompany-reported
Amprius reported shipping batteries to hundreds of customers during 2025, mostly for drones and other aircraft.
Amprius annual report (10-K), 2025
Who makes it
The companies
- AMPXNYSEAmprius TechnologiesPure play
Makes lithium-ion batteries with silicon nanowire anodes, used mostly in aviation.
We track:Nanowire anodes
Sources
Where every line comes from
Each source with the passage, word for word, that backs what we wrote.
- Amprius annual report (10-K), 2025
SiMaxx silicon anodes generally contain more than 1,000,000 nanowires per square centimeter.
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