Market and product

Batteries are no longer just used for flashlights or portable music players as in the past. Computers, smartphones, electric vehicles, and even national power grids now depend heavily on energy storage technology. This is especially true for renewable energy sources like wind and solar — which cannot always be used the moment they are generated. Without storage systems, solar power, for example, becomes useless at night.

However, the lithium-ion batteries widely used today still have notable limitations. They can be prone to overheating and fire if not carefully managed, and their lifespan is also limited. This is why phone and laptop batteries often need to be replaced after a few years, as each charge and discharge cycle gradually degrades their capacity.

Around the world, scientists and engineers are actively developing new battery technologies to improve safety, durability, charging speed, and energy density. Below are 10 emerging technologies — some already reaching the market, others still in research but with the potential to reshape the future.

1. Solid-state batteries

Unlike conventional batteries that use a liquid electrolyte — the medium that allows ions to move between the anode and cathode during charging and discharging — solid-state batteries use a solid electrolyte material. Many of today’s battery problems originate from the use of liquid electrolytes; replacing them with solid materials could make batteries safer, longer-lasting, and more energy-dense.

While the technology has existed in laboratories for some time, the biggest challenge lies in mass production at a reasonable cost. Several companies are now racing to commercialize it. Donut Labs claims to have produced the world’s first fully solid-state battery for commercial vehicles, although this claim has not yet been independently verified and the product has not entered the market. China’s Greater Bay Technology has also developed solid-state prototypes for electric vehicles and aims for large-scale production, alongside companies such as Prologium.

2. Sodium-ion batteries

Lithium — the key material in lithium-ion batteries — presents several challenges. Its mining process can be polluting, energy-intensive, and in some regions linked to labor exploitation. Global lithium supply may also struggle to meet future demand if electric vehicles and renewable energy storage expand rapidly.

Sodium, by contrast, is abundant, inexpensive, and can be extracted from salt. This makes sodium-ion batteries an attractive alternative. Their main drawback is lower energy density compared to lithium-ion batteries, making them less suitable for smartphones or high-performance EVs. However, for mass-market electric vehicles where slightly lower range or weight is acceptable, sodium-ion technology is promising.

China’s CATL has already launched the world’s first mass-produced sodium-ion battery for passenger vehicles, with an energy density of around 175 Wh/kg — competitive with lithium-ion batteries — and further improvements are expected. Charging speed, once a major limitation, has also improved significantly.

3. Silicon-anode batteries

In a battery, the anode and cathode are the two electrodes through which current flows in and out. The materials used for these electrodes greatly affect performance. In silicon-anode batteries, silicon replaces graphite in the anode.

This change can potentially double the energy density of lithium batteries in practice, and even more in theory. It is also the technology behind an electric vehicle battery capable of reaching up to 600,000 miles (nearly 1 million kilometers) of driving range.

This would be a major breakthrough for electric vehicles, where energy density is critical. Doubling driving range without increasing battery weight is highly desirable. The main challenge is that silicon expands and contracts significantly during charging cycles, leading to degradation. Engineers are addressing this by using composite materials that combine silicon with graphite to reduce stress.

4. Iron-air batteries

Better energy storage could significantly improve electricity production efficiency by allowing power generation to be scheduled more flexibly and reducing reliance on diesel generators during grid overloads. This is especially important for renewable energy, but also useful for nuclear and thermal power plants when excess electricity is generated.

One promising large-scale solution is the iron-air battery. These batteries store and release energy through a reversible oxidation process — essentially iron rusting and then being reduced again.

Iron-air batteries are large and heavy, making them unsuitable for vehicles or laptops. However, they are extremely cheap and scalable for grid-level storage. In simple terms, the same rusting process that is usually considered a disadvantage becomes a solution for storing energy over long periods using widely available iron, water, and air.

5. Lithium-sulfur batteries

Sulfur is abundant, inexpensive, and extremely lightweight. Compared to conventional lithium-ion batteries, lithium-sulfur batteries can achieve much higher energy density.

A research group in China has developed a lithium-sulfur battery with an energy density of 549 Wh/kg, doubling the flight time of drones compared to traditional lithium batteries.

More importantly, durability has improved significantly. Earlier versions suffered from rapid capacity loss, but this new design reportedly retains 82% capacity after 800 charge cycles — comparable to the best drone batteries currently available.

While unlikely to become the dominant battery technology due to limited cycle life compared to other systems, lithium-sulfur batteries are valuable for applications where energy density matters more than longevity.

6. Structural batteries

In electric vehicles, the battery is both the energy source and the heaviest component, typically serving no structural function. Structural batteries aim to integrate energy storage directly into vehicle components such as the chassis or body panels.

In 2024, researchers announced what was described as the “strongest battery in the world,” made from carbon fiber — a lightweight and durable material used in high-performance cars. This material is strong enough to function structurally while also storing energy.

This technology is especially important for electric aircraft, where weight is a major constraint. If the aircraft body itself can store energy, range and efficiency could improve significantly. Researchers are also exploring energy-storing concrete, potentially turning entire buildings into distributed energy storage systems for solar or grid power.

7. Nuclear microbatteries

Currently, nuclear power is mainly used in naval vessels, submarines, and deep-space probes. Nuclear microbatteries could change that and also help address nuclear waste challenges.

Although nuclear waste volumes are relatively small, they must be securely stored underground for hundreds of years due to their long-term hazard. Some of this waste could potentially be repurposed.

These microbatteries work by using radioactive materials that cause crystals to emit light, which is then converted into electricity using a process similar to solar cells. The power output is small but can last for decades, making them ideal for sensors and tiny devices.

Another controversial idea comes from Casimir, a company claiming to have developed a chip that harvests energy from quantum vacuum effects, though this claim remains highly debated.

8. Graphene-enhanced batteries

Graphene was discovered over two decades ago and has long been considered a potential breakthrough material for batteries. However, large-scale production has been a major challenge until recently.

Graphene is valued for its exceptional electrical conductivity. In theory, adding it to batteries could significantly increase charging speed and improve heat dissipation — both critical for electric vehicles.

While fully graphene-based batteries are not yet a reality, some commercial products already incorporate graphene, such as power banks. These offer faster charging and better thermal management, though at higher cost.

As production becomes cheaper, graphene-enhanced batteries may become a key foundation of future energy storage systems.

9. Flow batteries

Unlike solid-state approaches that eliminate liquid electrolytes, flow batteries fully embrace them. Instead of storing electrolytes inside the battery itself, they are kept in external tanks and pumped through the system.

Electricity is generated by circulating these liquids across a membrane where ions are exchanged. Charging can be done conventionally or by replacing the used electrolyte with fresh solution, making it almost instant.

Storage capacity can be increased simply by enlarging the tanks, making flow batteries ideal for grid-scale energy storage.

Recent developments in nanoelectrofuel technology — offering 15 to 25 times higher energy density than traditional flow electrolytes — may even make them viable for electric vehicles, potentially enabling refueling-like battery replacement in minutes.

10. Gravity batteries

Gravity batteries may sound like science fiction, but their principle is simple: store energy by lifting heavy objects and retrieve it by lowering them.

Electricity from wind or solar is used to lift heavy masses, such as concrete blocks, to a height. When energy is needed, the weight is slowly lowered, driving a generator and producing electricity.

These systems are often built in underground shafts or repurposed mines. Energy is stored as gravitational potential energy rather than chemical energy.

One leading company in this space was Gravitricity, but it ceased operations in 2025. Gravity storage belongs to a broader category of kinetic energy storage systems, which also includes flywheel batteries — systems that store energy by spinning a heavy rotor at very high speed and later converting that rotational energy back into electricity.

Source: Sydney Louw Butler, “10 Emerging Battery Innovations That Could Change The World”, BGR, 01/06/2026.