What question did this study set out to answer?

This research aims to enhance the performance of LiFePO4 batteries by improving charge/discharge rates and low-temperature functionality.

April 25, 2026

Synergistic Ionotronic Strategy for Constructing High-Rate Polyanion-Lattice-Engineered LiFePO 4

Puntos clave

This research aims to enhance the performance of LiFePO4 batteries by improving charge/discharge rates and low-temperature functionality.
Developed an ionotronic synergetic strategy using polyanion lattice engineering.
Substituted BO33– for PO43– in the LiFePO4 structure to create ion-diffusion pathways.
Incorporated 10% multiwalled carbon nanotubes to improve electronic conductivity.
Achieved an ultrahigh rate capacity of 75.3 mAh g–1 at 50 C.
Demonstrated 94.7% capacity retention after 2000 cycles at 10 C.
Obtained a discharge capacity of 41.3 mAh g–1 at 40 C at −20 °C.

Resumen

LiFePO4 (LFP)-based lithium (Li)-ion batteries are extensively used in electric vehicles and energy storage systems. However, the one-dimensional Li-ion diffusion channel and poor electronic conductivity limit its fast-charging and low-temperature performance. Herein, we introduce an ionotronic (ion/electron) synergetic strategy to overcome these limitations. Specifically, polyanion lattice engineering is developed by the planar triangle BO33– substitution on tetrahedron PO43–, thereby opening ion-diffusion pathways in the LFP structure. Furthermore, the incorporation of multiwalled carbon nanotubes (MWCNTs) significantly enhances the electronic conductivity of LiFe(PO4)0.98(BO3)0.02 (LFP-BO3). With these synergistic effects, the optimized LFP-BO3/10%MWCNTs exhibits ultrahigh rate capacity (75.3 mAh g–1 at 50 C) and long cycle stability (94.7% capacity retention after 2000 cycles at 10 C) at 25 °C. Moreover, LFP-BO3/10%MWCNTs also delivers excellent low-temperature performance, achieving a discharge capacity of 41.3 mAh g–1 at 40 C and high capacity retention at −20 °C.

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