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  Home   >   Research & Development   >   Next-generation battery materials

Next-generation battery materials

Battery Materials

Next-generation battery materials

The theoretical capacity density of lithium-air batteries is expected to exceed 10,000 KWh/kg, and actual experiments have achieved approx. 600KWh/kg has been achieved in actual experiments.
However, the challenge is that metallic lithium is used as the anode material and it is easily precipitated, causing safety and performance degradation when it reacts with moisture in the air.
All-solid-state batteries use a solid form of electrolyte, which allows for greater geometric freedom and no leakage.
The theoretical capacity density of all-solid-state batteries is 2000KWh/kg, and at this stage, research and development is underway for practicalization with the goal of 500KWh/kg.
Currently, sulfur-based and oxide-based solid-state batteries are in the spotlight, and products that can be applied to small home appliances such as electronic devices are being produced.
Efforts are being made to use silicon as the anode material for next-generation lithium-ion secondary batteries, and the acceleration of charging and discharging by changing the electrolyte is also an area of research.
Lithium-sulfur secondary batteries have a theoretical capacity density of 2500KWh/kg and are not only low-cost because they do not use metals such as cobalt, but also lightweight, so they are expected to be applied to the aerospace industry, including lightweight aircraft and UAMs.

01 Lithium-sulfur battery carbon fiber-sulfur composites

  • Carbon fibers, primarily 12K fibers with a filament count of 12,000, are commonly used, and recently, carbon fiber taws such as 48K and 62K are being used as composite materials. These carbon fiber tows are used to produce composite materials by impregnating them with liquid polymer resin, making them essential advanced materials used not only in the aerospace industry but also in the automotive industry.
  • Carbon fiber-sulfur composites secure the technology to produce integrated strands with over 50% sulfur particles between carbon fiber filaments through our developed special composite technology.
  • Integrated strands can be used to manufacture fabrics through weaving and can be easily processed into desired shapes using stamping technology, allowing for easy production of components. Additionally, there is an advantage of not needing a separate collector.

02 High-density graphite electrode material for lithium-air batteries

  • The porous high-strength graphite material used in lithium-air batteries is a crucial material that determines the performance and lifespan of the batteries. To meet these requirements, it is essential to use mechanically and thermally isotropic high-density graphite molded bodies
  • Our technology enables the production of isotropic graphite molded bodies without using binder materials, thereby eliminating the lack of isotropy caused by heterogeneity of binder components during sintering and graphitization processes. Moreover, being manufactured solely from carbon powder ensures excellent homogeneity, resulting in a density of over 1.95g/cm³ and a Shore hardness of over 80, making it highly suitable as a material for lithium-air batteries.

  • Considered the most promising alternative to lithium-ion batteries, Li-S batteries are expected to reach a market size of approximately $1.76 billion in 2027.
  • Following the development of lithium-sulfur batteries, there is also growing interest in lithium-air batteries, with trial production expected in 2030.

03 Manufacturing technology for carbon fiber-cathode composite panels

  • LFP cathode materials are widely used in lithium secondary batteries due to their low cost and chemical stability. Building on the idea that carbon fiber can serve as a functional component in battery electrodes, a research team at Chalmers University of Technology in Sweden is developing structural batteries capable of storing electrical energy.

Development of Carbon Fiber-LFP Composite Strands

  • In electric vehicles, the weight of the installed battery is generally heavier than a gasoline engine, making the vehicle heavier than its gasoline counterpart. Therefore, reducing the weight of the battery is key to improving fuel efficiency in electric vehicles. Professor Leif Asp has gained attention for developing a "structural battery" that nearly eliminates the load of the battery by increasing its strength and incorporating it into the vehicle's structure.
  • The idea of integrating the battery into the vehicle's structure has been proposed before. In 2017, Italian car manufacturer Lamborghini and the Massachusetts Institute of Technology (MIT) unveiled the "Terzo Millennio concept," which embeds batteries into foils to achieve both lightweighting and space-saving effects in electric vehicles.
  • To implement such a "structural battery" practically, the challenge of reconciling strength with battery performance must be addressed. One approach is to utilize carbon fibers used in carbon fiber-reinforced composite materials for the battery's cathode function. By focusing on carbon fiber materials that can maintain high strength and stiffness while storing electrical energy, the development of structural batteries is being pursued.
  • The proprietary technology involves the compounding of carbon fibers and powder particles, allowing for the simple manufacturing of high-concentration composite materials. Additionally, it enables the compounding of various cathode active materials, including NCM or NCMA, providing versatility in material selection.

04 Manufacturing Technology for Carbon Fiber-Anode Composite Panels

  • Both natural and artificial graphite, as well as silicon composites, have been widely used as anode materials for lithium-ion batteries due to their confirmed performance. In particular, silicon composite anode materials have garnered attention as next-generation anode materials. Therefore, by compounding these silicon composite anode materials with carbon fibers, not only can dimensional stability be ensured, but also a variety of composite materials with different compositions can be manufactured.

Development of Carbon Fiber-Graphite-Silicon Composite Anode Material

  • Both natural and artificial graphite powders are already widely used as anode active materials for lithium-ion batteries and are expected to continue to be used in the future. Meanwhile, research and development efforts are underway to address the expansion issue of silicon composite anode materials, with carbon coating emerging as one of the methods to solve this problem.
  • The proprietary technology includes securing a surface performance improvement agent manufacturing technology that greatly enhances the performance of the anode material through surface coating of graphite powder. Additionally, there is experience in establishing mass production facilities and selling products. Moreover, a dual-coating technology has been developed, which involves coating the surface of silicon particles with carbon and then recoating them on the surface of graphite particles, and performance evaluation is currently underway.
  • Therefore, by integrating the technology of compounding carbon fibers with anode material powders, it is possible to manufacture high-content composite materials easily. Furthermore, it is possible to selectively compound anode active materials as desired.

  • We possess the technology for manufacturing battery panels for electric vehicle chassis using carbon fiber sulfur compound composite and carbon fiber-LFP (Lithium Iron Phosphate) composite technology.
  • We are capable of developing and supporting the mass production of various metal composite manufacturing technologies according to market demand.

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