Industrial Electrospinning Machine| Foldable anode-free sodium batteries enabled by N,P.codoped carbon macroporous fibers incorporated withCoP nanoparticles

Prof. Lou Xiongwen at City University of Hong Kong in Science Advances (IF 11.7): N,P-Codoped Carbon Macroporous Fibers Integrated with CoP Nanoparticles for Foldable Anode-Free Sodium Batteries

Challenge: Anode-free sodium batteries (AFNBs) are considered promising alternatives for next-generation energy storage systems due to their high energy density, safety, cost-effectiveness, and simple manufacturing. However, their practical application is limited by low Coulombic efficiency (CE) and short lifespan caused by large volume changes and Na dendrite growth.

Approach: Prof. Lou Xiongwen at City University of Hong Kong proposed a 3D multifunctional host consisting of interconnected N,P-codoped carbon macroporous fibers with CoP nanoparticles (denoted as CoP@N/P-CMFs) for selective nucleation and uniform Na deposition.

Innovation 1: The porous framework reduces structural stress and suppresses dendrite growth by lowering local current density and homogenizing Na+ flux. Additionally, sodiophilic CoP and N,P-codoped carbon decrease the energy barrier for Na nucleation, further controlling uniform Na growth.

Innovation 2: CoP@N/P-CMFs exhibit low polarization and high CE (over 99.97%) at 10 mA cm-2 and 10 mAh cm-2. More importantly, the authors assembled foldable AFNBs pouch cells with Na3V2(PO4)3 (NVP) cathode and CoP@N/P-CMFs host, demonstrating improved cycling performance and good rate capability.

DOI: https://www.science.org/doi/10.1126/sciadv.adv2007