The stability of lithium-ion batteries is of paramount importance for their commercialization. However, strategies for improving electrode stability are still quite unsatisfactory due to the unclear mechanism of diffusion-induced stress and especially the regulation methods based on it. Herein, based on a columnar lithium-ion diffusion electrode model, a double high-elastic-modulus modification (DHEMM) method is proposed to inhibit deformation and relieve the generated stress during cycling. In this light, ${\mathrm{Ti}\mathrm{O}}_2/{\mathrm{V}}_2{\mathrm{O}}_5/$polypyrrole (PPy) nanofibers are accordingly synthesized with a significantly enhanced rate capacity (198.2 mAh ${\mathrm{g}}^{-1}$ at 1600 mA ${\mathrm{g}}^{-1}$) and electrochemical stability (91.9% capacity retention for 100 cycles at 100 mA ${\mathrm{g}}^{-1}$), offering an alternative way to fabricate stable lithium-ion batteries.

• Received 14 January 2022
• Revised 6 June 2023
• Accepted 21 July 2023

DOI:https://doi.org/10.1103/PhysRevApplied.20.024079