This study introduces a multifunctional carbon fiber–carbon nanotube (CFCNT) architecture as a lightweight, thermally stable, and recyclable current collector for lithium-ion batteries (LIBs). Compatible with both graphite anodes and LiFePO4 cathodes, the CFCNT platform reduces collector mass to 4.4 mg/cm2—substantially lower than conventional copper (10.1 mg/cm2) and aluminum (5.1 mg/cm2) while enhancing electrical conductivity and interfacial stability. Full pouch cells employing CFCNT collectors achieve an initial capacity of 153 mAh/g and retain 126 mAh/g after 150 cycles (0.11% fade per cycle), with >91% coulombic efficiency. Safety testing reveals minimal thermal response (< 2°C rise) during nail penetration, underscoring robust mechanical and electrochemical resilience. Critically, the architecture enables direct recovery and reuse of electrodes and current collectors, supporting a closed-loop recycling strategy. These results position CFCNT collectors as a viable pathway toward safer, high-performance, and circular energy storage technologies.
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2025 The Author(s). Battery Energy published by Xijing University and John Wiley & Sons Australia, Ltd.
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