High-Modulus Modifications: Stress-Resilient Electrode Materials for Stable Lithium-Ion Batteries

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, TiO2/V2O5/polypyrrole (PPy) nanofibers are accordingly synthesized with a significantly enhanced rate capacity (198.2 mAh g-1 at 1600 mA g-1) and electrochemical stability (91.9% capacity retention for 100 cycles at 100 mA g-1), offering an alternative way to fabricate stable lithium-ion batteries.

Automated summary

A double high-elastic-modulus modification (DHEMM) method is proposed to improve the stability of lithium-ion batteries. TiO2/V2O5/polypyrrole (PPy) nanofibers are synthesized, leading to significantly enhanced rate capacity and electrochemical stability.