Asahi Kasei Develops Novel Lithium Pre-doping Technology to Raise Energy Density and Lower Cost of Silicon-rich Lithium-ion Batteries

Japanese chemical maker Asahi Kasei says it has developed a new manufacturing technique that could make lithium-ion batteries cheaper and longer-lasting. The technology addresses a problem with silicon-based battery anodes (the part of a battery that stores energy during charging): silicon holds more energy than the graphite typically used, but it loses a lot of capacity permanently after the first charge cycle, which shortens battery life and forces manufacturers to add extra materials to compensate, raising costs.

Asahi Kasei's fix uses special additives that let manufacturers use lithium carbonate, a relatively cheap and widely available material, to replenish some of that lost lithium during the battery's first charge. In internal testing on a sample battery with a mostly graphite anode blended with some silicon, the company saw a 10% jump in energy density. The company says the process can be added to existing battery production lines without major changes, and could work across different battery chemistries.

This is lab and industry-level news, not something tied to a specific product yet. Asahi Kasei plans to run further testing with battery makers and license the technology rather than build batteries itself. If it works as described and gets adopted, it could eventually show up in cheaper, longer-lasting batteries for electric vehicles and other devices, including home battery storage. But there is no timeline yet for when, or whether, this reaches products homeowners could buy.