Sodium battery survival for 2,000 hours

Sodium battery can survive for 2,000 hours by adding Low-cost additive  

Sodium-ion batteries (SIBs) are emerging as a viable alternative to lithium-ion batteries (LIBs) due to their material sustainability and cost-effectiveness, helping address the high costs, supply limits and environmental concerns associated with lithium. Recent advances in electrode materials (e.g., layered oxides, hard carbon composites, metallic alloys) are greatly improving SIB stability, conductivity, capacity and cycle life. Improvements in both solid-state and liquid electrolytes have likewise enhanced ionic conductivity, capacity retention, thermal stability and safety. Despite their lower energy density, SIBs tolerate wider temperature ranges and carry a significantly lower risk of thermal runaway compared to lithium-based systems, making them attractive for industrial, transportation and large-scale power storage. Continuous progress in materials and cell engineering is narrowing the performance gap between SIBs and LIBs. Meanwhile, nascent battery recycling strategies for SIBs show promise for economic and environmental viability. Overall, SIBs represent a promising option for safer, more accessible and more sustainable energy storage technology.

Researchers at the National University of Singapore have developed a safer solid-state sodium battery using a low-cost additive which improves ion movement and blocks dangerous metal growth inside the battery. The breakthrough targets one of the biggest challenges facing sodium-ion batteries: safety. While sodium is cheaper and far more abundant than lithium, most sodium batteries still rely on flammable liquid electrolytes which can leak or catch fire. Solid polymer electrolytes are considered a safer alternative, but they typically suffer from poor conductivity and unstable contact with sodium metal electrodes. Over time, dendrites, needle-like metal structures, grow inside the battery and eventually trigger short circuits. The continued growth of solar and wind power is reshaping global energy systems, creating an urgent demand for storage technologies which are both durable and affordable. Despite their promise, high-voltage sodium batteries have remained difficult to commercialize due to a fundamental materials challenge: the electrolyte must stabilize both the highly reactive sodium metal anode and the high-voltage cathode, two surfaces which typically require opposite chemical conditions to remain stable. Traditionally, additives which protect one side of the battery tend to damage the other. This trade-off has been a major barrier to developing practical high-voltage sodium batteries.

The NUS team addressed both problems using graphitic carbon nitride, or GCN, a material produced by heating urea at 550 degrees Celsius. The additive was mixed into a polymer electrolyte film made from polyethylene oxide and sodium salt. The researchers said the ultra-thin GCN sheets reorganized the polymer structure, helping sodium ions move more freely while also improving mechanical strength inside the battery. The modified electrolyte more than doubled ionic conductivity at 55 degrees Celsius and significantly improved the sodium-ion transference number from 0.19 to 0.51. The team said nitrogen-rich sites on the GCN surface helped separate sodium ions from their salt pairs, increasing the number of charge-carrying ions available during operation. “What makes our approach powerful is its simplicity,” said Associate Professor Palani Balaya from NUS. “GCN can be made from one of the most widely available chemical precursors in the world and incorporated into a polymer system that is already scalable.” Repeated charging and discharging typically cause uneven sodium buildup on the electrode surface, eventually producing dendrites which pierce the electrolyte and destroy the battery. The additive helped solve this major problem in sodium-metal batteries: dendrite formation. According to the researchers, the GCN-enhanced polymer became three times stronger than the unmodified version, allowing it to physically resist dendrite penetration. It also formed a more stable protective layer on the sodium metal surface, helping guide uniform sodium deposition.

One of the greatest challenges engineers face is providing reliable power for modern devices and systems. Whether in handheld electronics, vehicles, or grid infrastructure, the need for efficient electrical energy storage is paramount. Rechargeable batteries are a common solution, allowing energy to be stored and released on demand. LIBs are currently the most prevalent form of rechargeable energy storage, largely due to lithium’s high gravimetric energy density. LIBs are found in countless applications and have proven reliable. However, there are drawbacks to lithium-based technology. Lithium is a relatively scarce element. In contrast, sodium is the sixth most abundant element on Earth, widely accessible in the form of sodium salts. Integrating sodium into batteries would mitigate raw material scarcity and reduce the cost of energy storage. Additionally, sodium salts are generally less toxic than lithium salts. On the other hand, SIBs have some inherent challenges. One issue is the larger ionic radius of Na+ compared to Li+, which leads to slower electrochemical kinetics in electrodes. SIBs have also been more difficult to stabilize over long cycle counts, and their cells tend to have lower energy density than LIBs of comparable size. 

In testing, the standard polymer electrolyte failed within 250 hours at a current density of 0.1 mA cm-2. The modified version operated stably for 1,000 hours under the same conditions and exceeded 2,000 hours at a higher current density of 0.2 mA cm-2 without failure. The team also built all-solid-state sodium battery cells using a sodium vanadium phosphate cathode and a sodium metal anode. At a 0.5C charge-discharge rate, the batteries retained 95% of their capacity after 500 cycles while maintaining a coulombic efficiency of about 99.97%. Researchers additionally demonstrated a pouch-cell version which continued powering an LED even while being folded, unfolded and cut, showing improved safety and mechanical stability. The team said it is now working on sodium batteries which can operate efficiently closer to room temperature while also developing bipolar stacked architectures aimed at increasing energy density. The approach offers a simple, low-cost route to stabilizing both electrodes simultaneously, enabling long-life sodium batteries which operate at voltages comparable to commercial lithium-ion systems. The study focused on how the additive interacts with ions in the electrolyte. The concept could accelerate this transition by narrowing the performance gap between sodium- and lithium-based technologies while maintaining the resource and cost advantages of sodium.

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World's largest floating wind turbine by China

China’s world's largest 16MW floating wind Turbine generates enough energy to power 4,200 Homes with clean energy

An energy company has successfully installed the world's largest single-unit floating offshore wind turbine off the coast of southern China. Company deployed a 16MW floating wind turbine in deep waters off Guangdong province, powering 4,200 homes with renewable energy annually. The project marks a major step in expanding renewable energy generation beyond shallow coastal regions. The turbine is designed to operate in harsh ocean conditions while producing enough electricity to power thousands of homes every year. Three Gorges Pilot marks a major step for deep-water renewable energy and the future of floating wind farms. The 16-megawatt system, was completed in waters too deep for a traditional fixed-bottom foundation near Yangjiang in Guangdong province. Floating wind turbines are designed to operate where depths make conventional offshore wind farms, which need to be anchored to the seafloor, impractical. Instead, the turbine sits atop a massive, floating platform which can be anchored in place, dramatically expanding the amount of ocean area available for wind power development.

The Three Gorges Pilot was built for harsh marine environments. Engineers designed it to withstand waves up to 20 meters and wind speeds up to 264 km's/ hour. Those conditions are comparable to a Category 5 hurricane. The platform uses a complex mooring system to remain stable in deep water. It combines suction anchors, heavy anchor chains and high-strength polyester lines. These systems help prevent drifting while keeping the turbine balanced during rough weather. The structure also includes ballast systems and real-time monitoring equipment. Ballast systems help maintain stability by controlling weight distribution inside the platform. Monitoring systems track movement, stress and environmental conditions during operation. Floating turbines face major engineering challenges because ocean waves constantly move the platform. Engineers must protect the blades, drivetrain and power systems from continuous motion. Long-term durability is important because repairs at sea are difficult and expensive. The design includes structural features which absorb and distribute pressure from strong winds and waves. These improvements reduce the platform’s stress over time. Engineers expect the system to achieve a longer operational lifespan as a result.

Built by China Three Gorges (CTG) Corp., Three Gorges Pilot is a 16-megawatt turbine mounted atop a semisubmersible platform. The rotor spans 827 feet (252 meters), with the blade tip rising more than 886 feet (270 m) above the water. The design follows on the heels of a turbine deployed last year by China Huaneng Group and Dongfang Electric Corp. Its primary improvements are at the structural and system engineering levels. The new platform is designed to survive inclement conditions in the deep ocean, including waves higher than 66 feet (20 m) and wind speeds up to 164 mph (264 km/h), the equivalent of a Category 5 hurricane. The design also includes several features intended to help absorb and distribute the force of the wind and water, thereby increasing the platform's durability and extending its operational lifespan. The new floating turbine was installed near Yangjiang in southern China. The company confirmed the completion of the offshore installation. The turbine has a power generation capacity of 16 megawatts. It stands on a floating semisubmersible platform instead of being fixed directly to the seabed. This design enables it to operate in waters too deep for conventional offshore wind farms. Floating offshore wind systems are becoming important for countries with limited shallow coastal areas.

Traditional offshore turbines need fixed foundations attached to the ocean floor. Floating systems remove this limitation and open larger ocean areas for renewable energy projects. The turbine features a rotor diameter of 252 meters. Its blade tip reaches more than 270 meters above sea level. This makes the structure one of the tallest and largest floating wind systems deployed anywhere in the world. Engineers completed most of the assembly work at Tieshan Port in southern China. The platform was later towed out to sea for final installation and testing. This method reduces construction complexity and lowers offshore installation time. The floating turbine uses a 66-kilovolt dynamic subsea cable to transmit electricity.  It's a specialized underwater power cable designed to carry high-voltage electricity while moving and flexing with the rest of the submersible platform. The cable uses reinforced armor layers and fatigue-resistant materials for long-term reliability. At full efficiency, the turbine is expected to generate around 44.65 million kilowatt-hours of electricity every year. According to US energy consumption estimates, this amount is enough to power about 4,200 homes annually. The project demonstrates how a single large turbine can support significant energy demand.

China has rapidly expanded offshore wind energy in recent years. The country is investing heavily in both fixed-bottom and floating wind technologies. Large-scale projects are part of its broader effort to increase renewable energy production and reduce dependence on fossil fuels. Adopting a wave-shaped design, it's engineered with high-flexibility conductors, reinforced armor layers for tensile strength and fatigue-resistant insulation and sheathing. Most of the turbine's assembly was completed on land, at Tieshan Port in southern China. It was then towed offshore and connected in its final location for testing. The installation is notable not just for its scale but for the integration challenges engineers managed to tackle: large rotor loading, platform stability, dynamic mooring and offshore grid connection. Floating turbines pose massive engineering challenges, as they are forced to endure constant motion from waves and currents without degrading drivetrain performance or blade clearance while also surviving extreme marine weather over long service lives.

The new system introduces improvements in structural engineering and offshore stability. It also highlights increasing competition in the global floating wind sector. Floating wind technology is gaining attention worldwide because many coastal regions have deeper offshore waters. Countries in Asia, Europe and North America are exploring similar systems for future energy development. Deep-water wind farms also offer access to stronger, more consistent wind conditions. For regions with a limited shallow continental shelf, projects like the Three Gorges Pilot could open up commercial-scale floating wind turbines for much deeper waters than fixed-bottom turbines can reach or survive. The successful installation of the Three Gorges Pilot shows how floating wind farms are moving closer to commercial-scale deployment. Engineers and energy companies continue working to improve reliability, reduce costs and increase energy output for people around the world.

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