Asahi Kasei has developed a lithium pre-doping technology intended to improve the energy density and cost performance of high-voltage lithium-ion batteries using silicon-based anodes. The approach uses lithium carbonate as an additional lithium source to compensate for irreversible capacity loss that can occur during the first charge-discharge cycle of silicon-rich cells, one of the key challenges associated with increasing silicon content in lithium-ion battery anodes.

As battery developers look to increase energy density for electric vehicles, humanoid robots and other high-demand applications, silicon-based materials are increasingly being evaluated as a partial replacement for graphite in the anode. Silicon can support higher energy density but also experiences significant irreversible lithium loss during initial charging. Compensating for this loss can require additional cathode active material, increasing both material use and cell cost.

Asahi Kasei lithium pre-doping technology for silicon-rich lithium-ion batteries | EV + Battery Tech Monthly

Conceptual illustration of Asahi Kasei’s lithium pre-doping technology, which uses lithium carbonate as a sacrificial lithium source to reduce first-cycle capacity loss in silicon-rich lithium-ion batteries. 

Asahi Kasei’s technology uses special electrolyte additives to promote decomposition of lithium carbonate at the operating voltages typically used in lithium-ion cells. This allows lithium carbonate to be added to the cathode as a sacrificial lithium source and decomposed during the initial charge to supply lithium that offsets first-cycle losses associated with the silicon-based anode. Lithium carbonate is already widely used as a battery material and provides a relatively low-cost lithium source for the pre-doping process.

In internal testing, Asahi Kasei evaluated the technology in an NMC cell using an anode containing 90% graphite and 10% SiO. The company reported a 10% increase in energy density for that specific cell configuration. Asahi Kasei also reports that the technology can improve cycle life while reducing cost per watt-hour and can be implemented without significant modifications to existing battery manufacturing lines. The company expects the approach to be applicable across a broader range of cathode and anode material combinations. By enabling lithium carbonate to function as a sacrificial lithium source at conventional cell voltages, the technology is intended to provide battery manufacturers with another option for addressing the first-cycle efficiency limitations associated with silicon-containing anodes. The ability to incorporate the process into existing manufacturing infrastructure could also reduce the production changes required to evaluate higher-silicon battery designs.

Asahi Kasei plans to work with battery manufacturers and other customers worldwide on proof-of-concept evaluations as it moves the technology toward practical application. The company also plans to offer the technology through licensing and other collaboration models tailored to individual customer development programs.

About Asahi Kasei

Asahi Kasei is a Tokyo, Japan-headquartered diversified technology and materials company with businesses spanning Healthcare, Homes and Material. Tracing its history to 1922, the company develops materials, components, chemicals, healthcare technologies and other products serving automotive, electronics, energy, construction, medical and industrial markets worldwide. Asahi Kasei generated approximately ¥3.07 trillion in consolidated net sales during fiscal 2025 and employed 47,895 people worldwide as of March 31, 2026. For more information, please click here.

Source/Photo Credit: Asahi Kasei

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Molly Bakewell Chamberlin
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