The World Needs Better Batteries!

Silicon Anode Fabrication Process

Learn how Amprius manufactures its ultra-high density silicon anode lithium-ion batteries!

We Enable the Future of Electric Mobility Today


  • 100% silicon anode battery(1)

Superior Battery Performance

  • High Energy Density
    • Up to 450 Wh/kg(2) and 1,150 Wh/L(2)(3)
  • High Power Density
    • Up to 10C
  • Fast Charge Rate Capability
    • 80% charge in <6 minutes
  • Wide Operating Temperature
    • -30°C to 55°C

Commercially Proven

  • Tested and validated by industry leading partners

Note: Certain performance metrics are based on specific Amprius products.
(1) Actual percentage of silicon is 99.5-99.9% which is within the range of acceptable purity levels for materials that are considered 100%.
(2) At C/10 and 23°C.
(3) Volumetric energy density is calculated using body dimensions at 30% state of charge (“SoC”).



Why is battery technology evolving so slowly?

The main reason for the slow pace of battery improvement is chemistry. In conventional lithium-ion batteries the anode is made of carbon in the form of graphite, and graphite has reached its energy density limit.

A new anode material is required to improve battery performance, and that material is silicon. Silicon can store up to 10 times more lithium compared to graphite which enables batteries to have much greater energy. But silicon swells dramatically when it is charged with lithium and that can cause it to crack and stop working.


Advantages of Amprius’ silicon batteries

Highest content active silicon material
Silicon is the best material for energy density. Using more silicon means that we can provide lithium-ion batteries with higher energy density, while at the same time enabling the highest ratio of energy to power.

Excellent cycle life
Amprius Technologies’ Silicon Batteries have excellent cycle life that is continuously improving. This has been demonstrated in real world use with multiple organizations including US National Labs and major aerospace companies.

100% Silicon Anode (1) Has ~10x Capacity vs. Graphite



Revolutionizing battery technology
Amprius Technologies’ silicon lithium-ion batteries are game-changers. Having the highest energy density in the industry, our batteries can substantially improve the performance of electric vehicles, aircraft, drones, and wearables.

Urban Air Mobility – estimated flight time based on customer models
Soldier Power – real data based on Conformal Wearable Battery developed for US army
Smartwatch – customer-reported data
Electric Vehicle – estimated relative to Tesla Model 3 long-range battery specifications

Chart showing the present and future evolution of battery technology and performance

Amprius Passes Nail Penetration Test

An independent third-party testing lab validated Amprius’ 390 Wh/kg polymer electrolyte cell by successfully passing the nail penetration test. Passing this test is important as Amprius cells have the potential to double energy content without increasing weight.

Amprius Extreme Fast-Charge Demonstration

Our commercially available 370 Wh/kg silicon anode battery demonstrated extreme fast charge rate of 0-80% state of charge in less than six minutes. Dr. Ionel Stefan explains the proprietary silicon nanowire anode technology and the unique battery characteristics that make it well positioned to address the electric mobility market.
Disclaimer: Please note that this presentation contains forward-looking statements. These statements are based on Amprius’ technology, business and expected market opportunities and are subject to uncertainty and changes in circumstance, many of which are beyond Amprius’ control, which may cause actual results to differ materially from those expressed or implied in such forward-looking statements. For a more complete discussion on forward-looking statements and the uncertainties related to Amprius’ technology, business and expected market opportunities, please refer to its filings with the Securities and Exchange Commission, including the discussion of Amprius’ risk factors in its Annual Report on Form 10-K filed on March 30, 2023.