Silicon-carbon battery anodes
A lithium-ion battery stores charge in its anode, usually made of graphite. Silicon can hold far more lithium, but it swells by up to 300% as it charges and cracks. Engineered silicon-carbon particles keep the gain while holding the swelling in check.
Android Authority, 19 Mar 2025How far from your life: It is probably already in your life.
Independently sourcedFrom lab to your life
Why it’s on step 5
- 1Lab discovery
- 2Working prototype
- 3Real-world testing
- 4Approved or on sale
- 5Everyday life
The rule
Widely used: in products or treatments that reach millions of people, or sold in ordinary shops.
- Silicon-carbon batteries had spread to many flagship phones, including the OnePlus 13, Honor Magic 7 Pro, OPPO Find X8 and vivo X200 series. Apple, Google and Samsung had not adopted them yet. Android Authority, 19 Mar 2025
The short version
What you need to know
- Why it matters
Phones get bigger batteries in the same space: silicon-carbon anodes give roughly 10% to 20% more energy, depending on how much silicon they hold.
Android Authority, 19 Mar 2025- Is it really nano?
Partly nano
The silicon is engineered into composite particles with carbon to survive the swelling. The structure matters, but it is one ingredient of an ordinary lithium-ion battery.
Android Authority, 19 Mar 2025- Where you’ll find it
In many new flagship Android phones, such as the OnePlus 13, and in some wearables.
Android Authority, 19 Mar 2025- Who’s behind it
Sila, and the battery makers behind phones from OnePlus, Honor, OPPO and vivo
On the record
Every step, dated
Newest first. Company-reported means the only source so far is the company itself.
- Production
Sila started operations at its silicon anode plant in Moses Lake, Washington, built for car batteries: 2 to 5 GWh of capacity at first.
Evertiq, 24 Sept 2025 - Widely used
Silicon-carbon batteries had spread to many flagship phones, including the OnePlus 13, Honor Magic 7 Pro, OPPO Find X8 and vivo X200 series. Apple, Google and Samsung had not adopted them yet.
Android Authority, 19 Mar 2025 - On sale
The Whoop 4.0 fitness tracker went on sale as the first product with Sila's silicon anode material, which raised its battery's energy density by about 17%.
MIT Technology Review, 8 Sept 2021
What's been promised
Promises, with dates
Dated targets someone set in public. We mark them met or missed only when a source shows it.
Sila (CEO Gene Berdichevsky)Said Sept 2021
Sila's silicon anode material would be in cars by around 2025.
MIT Technology Review, 8 Sept 20212025Target date passed
Who makes it
The companies
- Private companySila
Makes Titan Silicon, a silicon anode material for batteries, at a new plant in Moses Lake, Washington.
We track:Silicon anodes
Sources
Where every line comes from
Each source with the passage, word for word, that backs what we wrote.
- Android Authority, 19 Mar 2025
The most problematic is extreme expansion, with the structure swelling by up to 300% when fully charged.
- Evertiq, 24 Sept 2025
Operations will initially support 2-5 GWh of capacity
- MIT Technology Review, 8 Sept 2021
increased the energy density in the fitness tracker's battery by around 17%.
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