Scientists are working with a material that costs a quarter of what the battery industry has been developing around for the past ten years in a warehouse-sized facility in Argonne, Illinois, where the Department of Energy operates one of its flagship battery research labs. Without taking into account the supply chains that have turned lithium, cobalt, and nickel into geopolitical pressure points, the cathode materials, electrolyte, and anode are all sodium-based and derived from resources that the United States possesses in domestic quantities sufficient to support an industrial battery sector. Technically, the research is complicated. It’s not the basic strategic reasoning.
The DOE’s investment in sodium-ion storage is primarily driven by supply chain location and partially by battery chemistry. The electric vehicle and portable electronics industries have benefited greatly from lithium-ion batteries, and they will continue to do so. However, the regional concentration of lithium poses a risk to procurement, especially given the rapid growth in demand from the electric car sector. Cobalt is even more concentrated, with the Democratic Republic of the Congo providing most of the world’s supply under circumstances that have drawn ongoing criticism.
Supply chains for nickel pass through Russia and Indonesia. The majority of the output from all three mining regions is processed in China. The crucial mineral reliance ingrained in lithium-ion chemistry is a weakness that permeates every energy security strategy document for a government attempting to develop domestic industrial capacity for the clean energy transition.
Sodium is not the same. The most prevalent alkali element in the Earth’s crust, soda ash, is found in vast household deposits beneath Wyoming’s Green River Basin. With substantial yearly exports, the US is already among the world’s top producers of soda ash. It takes more than simply chemistry to switch from imported lithium compounds to homegrown sodium carbonate as the main feedstock for stationary grid storage batteries. Several of the more politically contentious links in the current battery production chain are eliminated as part of the supply chain reorganization.
The DOE’s special program to expedite this shift is called the LENS Consortium, or Low-cost Earth-abundant Na-ion Storage. It coordinates research across national laboratories and university partners to bring sodium-ion from demonstration-scale chemistry to commercially competitive technology. The effort aims to demonstrate the manufacturing scalability required to provide utility-scale projects while lowering the cost of sodium-ion cells to a point where they are competitive with lithium iron phosphate for grid storage applications. Although there is still a gap between the chemistry’s current state and its ideal state, it is far less than it was five years ago, and the progress curve has been heading in the correct direction.
The safety case for sodium-ion is often overlooked in favor of the supply chain narrative, but it is crucial for utilities and data centers, who are becoming more and more significant consumers of stationary storage. In addition to creating insurance and siting issues for grid storage projects, large lithium-ion installations have caused fires that are challenging to put out. In most configurations, sodium-ion cells can function with passive cooling instead of the active liquid cooling systems that increase the cost and complexity of maintenance for big lithium installations. They also have greater thermal stability, meaning they don’t react as strongly when overcharged or mechanically damaged. The insurance, maintenance, and cooling infrastructure cost disparities between the two chemistries are actual figures in a real budget for a utility making a capital choice on a 100 megawatt-hour storage project.
Chinese producers have so far spearheaded the commercial development of sodium-ion, especially CATL, which revealed a first-generation sodium-ion product line in 2021 and has been increasing output ever since. The people working on this are aware of the irony that the DOE is making significant investments in sodium-ion as a strategy for supply chain independence while the top commercial producer is Chinese. Before sodium-ion becomes another technology where Chinese manufacturing domination duplicates the same dependency that lithium-ion generated, DOE is working to develop a domestic business that can compete at scale. It is actually unclear if the funding and research initiatives will yield that result within the timeframe needed for grid storage deployment.
