KIST Develops Novel Carbon-Fiber Composite Structural Battery Retaining Exceptional Mechanical Properties
Recently, the Energy Research Center at the Korea Institute of Science and Technology (KIST) has developed an innovative carbon fiber-reinforced composite material battery structure that significantly elevates energy density while retaining superior mechanical properties.
Historically, the commercialization of batteries has been impeded by the low integration of mechanical and electrochemical performance. Prior research has predominantly focused on integrating lithium-ion batteries into layered composite materials, resulting in marginal improvements in both electrical and mechanical characteristics. In light of these challenges, KIST has embarked on a pioneering research initiative.
The team initially scrutinized the curing mechanisms of epoxy resins in conjunction with ionic liquids and carbonate-based solid polymer electrolytes (SPEs). Subsequently, they optimized the curing process by meticulously controlling temperature and pressure, which led to enhanced structural battery performance.
Moreover, the researchers have introduced a novel vacuum-assisted compression molding technique for the fabrication of structural batteries. This method effectively minimizes the presence of bubbles and defects, thereby further augmenting battery performance.
In the newly developed structural battery, the volumetric proportion of carbon fiber, which serves as both electrodes and current collectors, has been increased by at least 160%. This substantial increase in the electrode surface area and its contact area with the electrolyte has resulted in a marked improvement in energy density. Concurrently, the mechanical properties of the battery have been significantly bolstered due to the reinforcing effect of the carbon fibers.
The researchers conducted comprehensive electrochemical performance and mechanical property assessments on the novel structural battery. The findings revealed that the battery exhibits high energy density and commendable cycling stability; even after numerous charge-discharge cycles, the battery's capacity retention remains substantial. Additionally, it demonstrates exceptional tensile and compressive strength, enabling it to withstand substantial external forces without incurring damage.
Attention was also given to the issue of internal bubble formation within the structural batteries. By precisely managing the curing temperature and pressure, the researchers have successfully reduced the quantity and size of bubbles, which in turn has enhanced the battery's ionic conductivity and mechanical robustness.
Furthermore, the researchers investigated the effects of various carbon fiber types and electrolyte combinations on the performance of structural batteries. The findings indicated that specific carbon fiber and electrolyte combinations can further optimize battery performance. Certain carbon fiber types exhibit enhanced electrical conductivity and mechanical strength, while certain electrolytes display improved ionic conductivity and chemical stability. By strategically selecting the appropriate carbon fiber and electrolyte combinations, it is possible to further augment the energy density and mechanical properties of structural batteries.
KIST's research presents a potential high-performance energy solution for applications such as electric vehicles, unmanned aerial vehicles, and robotics, holding promise for broad application across various sectors.
