EVs and humanoid robots are both pushing battery makers toward the higher energy densities that Asahi Kasei’s lithium pre-doping technology targets
(Image courtesy of Asahi Kasei)
Asahi Kasei has developed a lithium pre-doping technology that allows low-cost lithium carbonate to offset the capacity loss inherent to silicon-based anodes in high-voltage lithium-ion batteries. Internal testing on an NMC cell with a 90% graphite, 10% silicon monoxide anode returned a 10% increase in energy density. The Tokyo-headquartered materials group plans to license the technology and is opening it to proof-of-concept evaluations with battery manufacturers worldwide.
Addressing the capacity loss of silicon-rich anodes
Silicon stores more lithium per gram than graphite, which is why cell makers are blending it into anodes to meet rising energy density demands from EVs and humanoid robots. But silicon-rich anodes lose capacity irreversibly during the first charge-discharge cycle. Compensating for that loss conventionally means adding more cathode active material, which increases both material use and cost. Asahi Kasei’s technology targets this specific inefficiency rather than the anode chemistry itself.
How the Asahi Kasei lithium pre-doping technology works
The company selected lithium carbonate as its pre-doping source because it is inexpensive and already has an established track record in LIB manufacturing. The obstacle has always been voltage. Lithium carbonate’s decomposition voltage sits well above the normal operating range of standard lithium-ion cells, which has historically ruled it out for pre-doping applications.
Asahi Kasei’s approach uses specific electrolyte additives to lower the effective decomposition voltage, allowing lithium carbonate to be pre-added to the cathode as a sacrificial lithium source. During the initial charge it decomposes and releases lithium to compensate for what the anode consumes, without requiring a new class of raw material or a separate processing step.
Asahi Kasei lithium pre-doping test results show energy density gains
Asahi Kasei reports a 10% energy density increase in internal testing using an NMC cell with a 90% graphite, 10% silicon monoxide anode. The company also states the approach can improve cycle life at a lower cost per watt-hour and can be introduced without significant modification to existing battery manufacturing lines. Asahi Kasei expects the technology to be broadly applicable across a range of cathode and anode material systems, though this broader applicability is the company’s own forward projection rather than a tested result at this stage.
Licensing plans and commercial rollout
Asahi Kasei plans to license the technology through flexible collaboration frameworks tailored to each customer’s development stage, rather than pursuing in-house cell production. The initiative sits under the company’s Technology-value Business Creation programme, part of its medium-term management plan, through which Asahi Kasei is targeting at least 10 new licence agreements across fiscal 2025 to 2027 and a cumulative profit contribution of ¥10 billion or more by around 2030.
Asahi Kasei says it will now work with customers globally to run proof-of-concept evaluations, the next step before any commercial deployment decision. No timeline for a first licence agreement specific to this technology has been disclosed.
Stay ahead in the electrification revolution. Explore more breakthroughs from leading innovators in electric commercial transport – visit our news page.