As global attention to renewable energy continues to grow, installed capacity for solar, wind, and other renewable sources keeps increasing. However, renewable generation is variable and intermittent, requiring energy storage systems to store and regulate electricity. The performance characteristics of lithium titanate (LTO) batteries give them strong potential in energy storage applications, particularly in projects with demanding performance and safety requirements. Lithium titanate has a higher electrode potential than metallic lithium, making lithium dendrite formation less likely and significantly reducing the risk of short circuits. In applications with exceptionally high safety requirements—such as grid-scale energy storage stations, telecommunications base stations, and special-purpose vehicles—these safety advantages are particularly pronounced. In large energy storage projects, for example, LTO batteries can help reduce safety incidents and support stable system operation.
The production cost of LTO batteries remains comparatively high, primarily due to complex manufacturing processes and elevated raw-material prices. This cost premium is reflected in the relatively high market price of LTO batteries, limiting their adoption in cost-sensitive applications. Jiangsu Longxin’s optimized LTO spray dryer is designed to address material-specific processing challenges, improve LTO material performance, and reduce production costs. This enables manufacturers to respond more effectively to market competition and evolving industry challenges, with strong potential for future market adoption.
Lithium Titanate Spray Dryer
Working Principle
- Feed preparation: A liquid slurry containing lithium titanate is delivered through a feed system—typically controlled by a pump—to the atomizer of the spray dryer. The slurry generally has a moisture content of 40%–60%, and in special cases can reach 90%.
- Atomization: The slurry reaches a high-speed rotary atomizer, which typically operates at a peripheral speed of 160–230 m/s. Centrifugal force discharges the slurry from the edge of the atomizer wheel and disperses it into extremely fine droplets. This atomization method converts the slurry into small, uniform droplets, greatly increasing the contact area between the liquid and hot air and creating the conditions for rapid drying.
- Drying: Air used as the drying medium—typically hot air—is drawn in by a blower according to the operating instructions after passing through pre-filters and medium-efficiency filters, and is then heated by a heater. The heated air passes through a high-efficiency filter and hot-air distributor before entering the main drying chamber in a uniform flow. Inside the chamber, the fine droplets come into full contact with the hot air. Because the surface area of the droplets has increased substantially, the water in the droplets evaporates rapidly. Heat is transferred from the hot air to the droplets, causing the water to vaporize quickly and the lithium titanate to gradually form solid particles. The entire drying process is completed in a very short time, typically only a few seconds.
- Product collection and exhaust discharge: The dried lithium titanate particles travel with the hot air into a bag filter, where they are separated from the gas and collected. The collected lithium titanate powder is the dried product. The gas remaining after particle separation may still contain small amounts of fine particles and water vapor. This exhaust gas undergoes further filtration to remove impurities and is discharged through an induced-draft fan only after meeting applicable environmental emission requirements.
Technical Advantages
High Drying Efficiency
- Rapid evaporation: Atomization greatly increases the surface area of the feed liquid and its contact area with hot air. In the hot-air stream, 95%–98% of the moisture can evaporate almost instantly, with drying completed in just a few seconds. This rapidly removes water from the LTO slurry and forms dry powder particles.
- Continuous production: Continuous feeding and discharge are possible, with a high degree of automation. The system can meet the requirements of large-scale production while significantly improving production efficiency.
Consistent Product Quality
- Uniform particle size: The atomization system disperses the feed liquid into fine, uniform droplets, resulting in a relatively narrow particle-size distribution and good batch-to-batch consistency in the dried LTO product.
- Good flowability and dispersibility: The dried powder particles have a regular shape and good flowability, making them easy to handle and disperse in downstream processing and applications. Good dispersibility also supports the performance of lithium titanate in battery applications.
- High purity: Drying takes place in a relatively enclosed environment, reducing the introduction of external contaminants. No additional crushing or screening is required after drying, lowering the risk of product contamination and supporting high product purity.
Suitable for Heat-Sensitive Materials
LTO materials are sensitive to temperature, and conventional drying methods may degrade material performance. The LTO spray dryer uses a co-current drying configuration in which hot air and droplets flow in the same direction. The hot air comes into contact with the atomized droplets immediately upon entering the drying chamber, causing the chamber temperature to drop rapidly. This helps prevent the material from overheating and makes the system particularly suitable for heat-sensitive materials.
Simplified Production Process
- Single-step drying and granulation: LTO slurry with a moisture content of 40%–60%—or up to 90% for special materials—can be dried directly into powder or granulated product in a single step. This eliminates the cumbersome intermediate steps of conventional drying, crushing, and screening, simplifying the production process and reducing labor intensity and production costs.
- Convenient operation and control: The equipment is equipped with an advanced control system that enables precise control and adjustment of drying parameters such as temperature, feed rate, and atomizer speed, supporting stable equipment operation and consistent product quality. The user-friendly interface makes the system easy to operate and manage.
Reliable Equipment Design
- Quality materials: To prevent corrosion and contamination, material-contact parts are typically made from high-quality materials such as stainless steel, providing good corrosion and wear resistance and helping extend equipment service life.
- Well-designed structure: The dryer’s structure has been optimized, with close-fitting components and stable, reliable operation. It supports prolonged continuous operation while reducing equipment failures and maintenance costs.
