The biggest shift in electric car batteries right now is the move toward solid-state technology, which could roughly double the energy stored per kilogram compared to today’s lithium-ion packs. But solid-state isn’t the only advancement worth watching. Several new battery chemistries are racing toward production at the same time, each solving a different problem: longer range, faster charging, lower cost, or fewer rare materials.
Solid-State Batteries: The Headline Technology
Solid-state batteries replace the liquid electrolyte inside conventional lithium-ion cells with a solid material, typically a ceramic or sulfide compound. This single change unlocks a cascade of improvements. Energy density is expected to reach 400 to 500 Wh/kg, compared to 250 to 300 Wh/kg for today’s best commercial lithium-ion cells. In practical terms, that means a battery pack of the same weight could deliver roughly twice the driving range, or an automaker could use a smaller, lighter pack to hit the same range at lower cost.
The solid electrolyte also eliminates the flammable liquid that makes conventional cells a fire risk during crashes or manufacturing defects. That safety margin lets engineers pack cells more tightly, saving even more space. Charging speed improves too, because lithium ions can move through certain solid electrolytes faster than through liquid ones without triggering the kind of internal short circuits that degrade conventional cells during rapid charging.
Toyota plans to launch the world’s first EV with a solid-state battery in 2027 or 2028. Honda, Nissan, BMW, and Volkswagen are all developing their own versions, either independently or through partnerships. Sumitomo Metal Mining expects to begin supplying cathode material for solid-state production starting in 2028. The technology is real and funded, but manufacturing at scale remains the core challenge. Producing thin, defect-free solid electrolyte layers at automotive volumes is significantly harder than pouring liquid into a cell casing, and no company has demonstrated that at mass-market quantities yet.
Silicon Anode Cells: Faster Charging Now
While solid-state batteries are still a few years from showrooms, silicon anode technology is already showing up in production vehicles and prototypes. Traditional lithium-ion batteries use graphite on the negative electrode. Silicon can absorb roughly ten times more lithium than graphite, which boosts energy density and enables much faster charging without the same risk of damage to the cell.
In pouch cell testing, a fast-charging protocol pushed a silicon anode cell from 10% to 80% in just 14.5 minutes at room temperature. That’s approaching the refueling experience of a gas station stop. The tradeoff is that silicon expands dramatically as it absorbs lithium, up to 300%, which can crack the electrode and shorten the battery’s life. Current approaches use silicon mixed with graphite, or nanostructured silicon particles, to manage that swelling. Several startups and major cell manufacturers are already shipping cells with increasing silicon content, making this one of the nearer-term upgrades you’ll see in new EVs.
LFP Batteries: The Quiet Winner
Not every breakthrough involves exotic new materials. Lithium iron phosphate (LFP) batteries use no cobalt or nickel, relying instead on iron and phosphate, both cheap and abundant. LFP cells store less energy per kilogram than the nickel-based chemistries common in European and American EVs, but they last longer, cost less, and are far less prone to thermal runaway.
LFP’s market share has grown fast. It supplied more than 40% of global EV battery demand by capacity in 2023, more than double its share in 2020, according to the International Energy Agency. LFP dominates the Chinese EV market and is increasingly appearing in Western models, particularly for standard-range trims where maximizing range matters less than keeping the sticker price down. Tesla, Ford, and Rivian have all adopted or announced LFP packs for certain vehicles. For many buyers, the combination of a lower purchase price, longer calendar life, and better safety profile makes LFP the most practical battery improvement already on the road.
Sodium-Ion Batteries: Removing the Lithium Problem
Sodium-ion batteries swap lithium for sodium, an element so abundant it’s essentially inexhaustible (table salt is half sodium). The chemistry avoids lithium, cobalt, and nickel entirely, which sidesteps the supply chain bottlenecks and price volatility that have plagued EV production. Sodium-ion cells are already close to cost parity with lithium-ion on a per-cell basis, and projections suggest they could become meaningfully cheaper over the medium term because their raw materials are less prone to price spikes and supply shortages.
The limitation is energy density. Current sodium-ion cells store less energy per kilogram than lithium-ion, making them better suited for city cars, micro-EVs, and energy storage systems than for long-range highway vehicles. Chinese automakers BYD and JAC have already released affordable EVs using sodium-ion packs, and CATL, the world’s largest battery manufacturer, is scaling production. For budget-conscious markets, sodium-ion could do more to accelerate EV adoption than any high-end chemistry by making electric cars genuinely cheap.
Lithium-Sulfur: High Potential, Major Hurdles
Lithium-sulfur batteries promise exceptionally high energy density because sulfur is ultralight and can bond with large amounts of lithium. Sulfur is also dirt cheap and globally abundant. On paper, this chemistry could outperform even solid-state cells on range per kilogram.
In practice, lithium-sulfur has a serious durability problem. During charging and discharging, sulfur compounds dissolve into the electrolyte and migrate to the wrong electrode, a process called polysulfide shuttling. This gradually strips material from the cathode and deposits it where it doesn’t belong, killing capacity over relatively few charge cycles. Researchers at Argonne National Laboratory and elsewhere are working on barriers and electrolyte modifications to contain this shuttling, but the technology remains largely experimental. Lithium-sulfur is the furthest from commercial EV use among the chemistries covered here, likely a decade or more from mass production.
Where Battery Costs Stand Today
All of these technologies are developing against a backdrop of steadily falling prices. Lithium-ion battery pack prices dropped 8% to a record low of $108 per kilowatt-hour in 2025, according to BloombergNEF. Packs specifically for battery electric vehicles crossed below $100/kWh for the second consecutive year, hitting $99/kWh. That $100 mark has long been considered the threshold where EVs reach upfront price parity with combustion vehicles without subsidies. Prices are expected to fall again in 2026.
These cost reductions come from manufacturing scale, cheaper raw materials, and the shift toward LFP and other cobalt-free chemistries. New technologies like solid-state and sodium-ion will initially carry a price premium, but their long-term cost trajectories point downward as production ramps. The practical effect for buyers over the next three to five years is a widening menu: longer-range EVs using silicon-rich or solid-state cells at the top, affordable city EVs using sodium-ion or LFP at the bottom, and steadily lower prices across the board.