Amprius Technologies Inc., founded in 2008 and based in Fremont, California, is a leading manufacturer of high-energy lithium-ion batteries. The company specializes in producing advanced silicon anode batteries with superior energy density, achieving up to 500 Wh/kg and 1,300 Wh/L – nearly double the performance of traditional lithium-ion cells. Through its innovative approach to battery development and manufacturing, Amprius serves various sectors including electric vehicles, aviation, and portable electronics. The company became publicly traded on the New York Stock Exchange (NYSE: AMPX) in September 2022, marking a significant milestone in its growth trajectory.
Battery Technology
Amprius’ primary technological advancement lies in its silicon nanowire anode technology, which represents a significant improvement over conventional graphite anodes. The company offers two main product platforms: SiMaxx™ and SiCore™. The SiMaxx™ platform showcases the company’s established silicon nanowire technology, delivering industry-leading energy density for specialized applications. In early 2024, Amprius introduced the SiCore™ platform, expanding its capabilities to serve additional market segments.
The manufacturing process involves proprietary techniques for fabricating silicon anodes and integrating them into high-performance cells. These cells demonstrate exceptional charging capabilities and extended cycle life compared to traditional lithium-ion batteries. The technology enables more compact and lighter battery designs while maintaining high performance standards. This advancement proves particularly valuable in applications where weight and space constraints are critical factors, such as electric aircraft and military equipment.
Recent Projects
In January 2025, Amprius announced significant progress with its SiCore cell chemistry, achieving 370 Wh/kg energy density and exceeding 3000 W/kg power performance. The company shipped SiMaxx A-Sample EV Cells to the United States Advanced Battery Consortium in November 2024, addressing electric vehicle range and charging time challenges. October 2024 marked the expansion of production capacity through new contract manufacturing lines, adding 800 MWh capacity for SiCore pouch cells. Additionally, Amprius secured a development contract with a Fortune 500 company in October 2024 for custom high-energy SiMaxx pouch cells.
Investors
Amprius Technologies completed a merger with Kensington Capital Acquisition Corp. IV in September 2022, resulting in approximately $87 million in gross proceeds. This transaction supported the company’s expansion plans, including the development of a gigawatt-hour scale manufacturing facility. Following the merger, Amprius began trading on the NYSE under the ticker symbol “AMPX,” with warrants trading as “AMPX.W.” While specific information about private investors remains limited, the public listing opened opportunities for broader market investment.
Business Details
Location: Fremont, California, USA
Additional Facilities: Planned gigawatt-scale factory in Brighton, Colorado
Website: https://amprius.com
LinkedIn: https://www.linkedin.com/company/ampriustechnologies/
