Lithium-ion batteries are unlikely to disappear from electric vehicles anytime soon. They dominate the market thanks to decades of development, falling costs and an increasingly mature manufacturing ecosystem.
But researchers and battery companies are pursuing alternatives that could reduce dependence on lithium and other critical materials, improve safety or deliver much higher energy density. Some are already entering production, while others remain experimental. Here are five battery technologies that could reshape the future of EVs.
1. Sodium-ion batteries
Sodium-ion batteries are arguably the closest alternative to lithium-ion currently moving toward wider commercialization. They work on similar principles but replace lithium with sodium, an abundant and widely available element. The technology is already being scaled up by major manufacturers including CATL and BYD, and sodium-ion-powered electric cars have already appeared in China.
The trade-off is energy density. The latest sodium-ion cells can reach around 175 Wh/kg, compared with up to 205 Wh/kg for LFP and roughly 265 Wh/kg for some NMC batteries. That makes them better suited, at least initially, to smaller EVs, urban vehicles and commercial applications where maximum range is less important.
2. Solid-state batteries
Solid-state batteries replace the flammable liquid electrolyte found in conventional lithium-ion cells with a solid material. The technology promises improved safety and potentially much higher energy density, particularly if paired with lithium-metal anodes. That could eventually translate into longer driving ranges without dramatically increasing battery size or weight.
The biggest challenge is manufacturing. Solid-state cells remain expensive and difficult to produce at scale, and their real-world advantages still need to be demonstrated in mass-produced EV battery packs. The IEA considers the technology to be progressing rapidly, but full commercialization remains a significant engineering challenge.
3. Lithium-sulfur batteries
Lithium-sulfur batteries could offer a major leap in energy density, making them particularly attractive for long-range vehicles and heavier forms of electric transport. Sulfur is abundant and inexpensive, while the chemistry has the potential to store considerably more energy by weight than today’s conventional lithium-ion batteries. The IEA identifies lithium-sulfur as one of the emerging technologies that could benefit applications requiring exceptionally high energy density, including electric trucks, boats and aircraft.
However, durability remains a major obstacle. Current designs can suffer from limited cycle life and other technical problems that have prevented widespread commercialization. A recent comparative analysis also found that present lithium-sulfur designs face high cost and environmental challenges.
4. Magnesium-ion batteries
Magnesium-ion batteries replace lithium with magnesium, an abundant element that can theoretically transfer two electrons per ion rather than one. That characteristic could potentially allow magnesium-based batteries to store substantial amounts of energy. Magnesium is also more widely available and could reduce pressure on lithium supply chains.
The problem is that magnesium ions interact strongly with battery materials, making it difficult to develop electrodes and electrolytes that can charge and discharge efficiently over repeated cycles. For now, magnesium-ion technology remains primarily at the research and development stage rather than being ready for commercial EVs.
5. Zinc-based batteries
Zinc-based batteries are attracting attention because zinc is abundant, relatively inexpensive, and can support safer battery designs, particularly aqueous systems that use water-based electrolytes. Technologies including zinc-ion and zinc-air batteries are being developed for energy storage and other applications. Their potential advantages include lower material costs and reduced fire risk.
Their challenge is energy density and rechargeability. Zinc-based systems still need significant improvements before they can compete with lithium-ion batteries in passenger EVs, where weight and volume are critical. Some advanced zinc battery research is showing impressive cycle life, but much of the technology remains better suited to stationary storage than cars for now.
The battery future may not have one winner
The most likely future is not a single technology replacing lithium-ion across every type of vehicle. Sodium-ion could power affordable city cars, solid-state batteries could target premium long-range EVs, and lithium-sulfur could eventually enable heavier electric transport. Other chemistries may find their place in specialized applications.
As of now, lithium-ion remains the technology to beat. But the race to build its successor, or successors, is already well underway.