POS6-1390
Carbon Fiber-Reinforced Redox-Active Polymer (CFRRAP) Composites for Structural Battery Cathodes
When and Where
Nov 30, -0001
00:00 - 00:00
Room 301 (Grand Ballroom)
Presenter(s)
Joohwan Eo (Korean institute of scienc and technology(KIST))
Co-Author(s)
Abstract
Multifunctional structural batteries that simultaneously provide electrochemical energy storage function and mechanical load-bearing capability have attracted considerable attention because they can reduce system-level weight, thereby extending the operation time and range of electric mobilities. However, conventional structural electrodes, in which particulate active materials are deposited on carbon fiber (CF) current collectors, are prone to cracking and delamination even under modest mechanical loads, resulting in failure of the whole structural battery cell.
Here, we introduce carbon fiber-reinforced redox-active polymer (CFRRAP) composites as a novel composite material design for high-performance structural cathodes. In this design, an aromatic polyimide (PI) serves as the polymer matrix that can tightly bind CF, similar to the epoxy matrix in conventional carbon fiber-reinforced polymers (CFRPs). Unlike electrochemically inactive epoxy, however, the PI matrix in CFRRAP can reversibly store/release Li-ions through redox reactions of its carbonyl groups. To compensate for the low electrical conductivity of PI matrix, carbon black is incorporated as a conductive filler in the PI-based CFRRAP. The optimized PI-CFRRAP electrode delivers a specific capacity of 139 mAh g⁻¹ at 0.1 C in Li half-cells, corresponding to ~99% utilization of its theoretical capacity. Furthermore, the PI-CFRRAP composite exhibits a high elastic modulus of 50 GPa and a tensile strength of 442 MPa. These combined electrochemical and mechanical properties result in a multifunctional efficiency of 1.1, demonstrating the promising potential of PI-CFRRAP composites as robust, lightweight structural cathodes.
Here, we introduce carbon fiber-reinforced redox-active polymer (CFRRAP) composites as a novel composite material design for high-performance structural cathodes. In this design, an aromatic polyimide (PI) serves as the polymer matrix that can tightly bind CF, similar to the epoxy matrix in conventional carbon fiber-reinforced polymers (CFRPs). Unlike electrochemically inactive epoxy, however, the PI matrix in CFRRAP can reversibly store/release Li-ions through redox reactions of its carbonyl groups. To compensate for the low electrical conductivity of PI matrix, carbon black is incorporated as a conductive filler in the PI-based CFRRAP. The optimized PI-CFRRAP electrode delivers a specific capacity of 139 mAh g⁻¹ at 0.1 C in Li half-cells, corresponding to ~99% utilization of its theoretical capacity. Furthermore, the PI-CFRRAP composite exhibits a high elastic modulus of 50 GPa and a tensile strength of 442 MPa. These combined electrochemical and mechanical properties result in a multifunctional efficiency of 1.1, demonstrating the promising potential of PI-CFRRAP composites as robust, lightweight structural cathodes.
