As Sodium‐ion battery (SIB) technology progresses toward commercial viability, sustainable end‐of‐life (EOL) management is critical. Methods for recycling key components such as hard carbon (HC), a negative electrode material, remain underexplored. This study introduces a direct and efficient recycling approach for HC from production scrap and EOL cells using “ice‐stripping” followed by a low‐temperature binder negation at 300 °C under nitrogen. The effects of temperature on HC structural integrity and electrochemical performance are comprehensively characterized using XRD, Wide‐Angle X‐ray Scattering (WAXS), and XPS. Heating above 400 °C induces irreversible damage to HC's graphene layers and modifies the carbon surfaces, resulting in poor electrochemical performance. However, HC reclaimed at 300 °C retains near‐pristine electrochemical performance, with capacities of 243 mAh g⁻¹ (scrap) and 228 mAh g⁻¹ (EOL) after 50 cycles. Full‐cell configurations demonstrates robust cycling stability, with 86% and 89% capacity retention after 200 cycles for HC derived from scrap and EOL cells, respectively. This work highlights the potential of lower‐temperature, direct recycling to enable a circular economy for SIBs. The findings set a benchmark for developing sustainable recycling methods for HC and other SIB components.

In recent years, sodium-ion batteries (SIBs) have attracted much attention as an alternative to lithium-ion batteries. Hard carbon (HC) is a well-studied anode material for SIBs; however, the performance as a function of temperature is less established. To investigate temperature dependence of the performance of HC, sodium half-cells with a common NaClO₄-based electrolyte were tested at temperatures from 10 to 80 °C. Capacity after 20 cycles at 100 mA g⁻¹ current varied from 90 mA h g⁻¹ at 10 °C to 270 mA h g⁻¹ at 60 °C. Increased temperature significantly improves the HC rate capability, with 120 mA h g⁻¹ capacity found at 60 °C with 500 mA g⁻¹ current. Stability was high at moderate temperature with 220 mA h g⁻¹ capacity remaining after 200 cycles at 40 °C with a current of 100 mA g⁻¹.