Accelerating Li-Ion Diffusion in LiFePO<sub>4</sub> by Polyanion Lattice Engineering.
basic_science · Level V
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- Record sourced from PubMed, PMID 39385651.
- Also identified by DOI 10.1002/adma.202410482.
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Abstract
Despite the widespread commercialization of LiFePO<sub>4</sub> as cathodes in lithium-ion batteries, the rigid 1D Li-ion diffusion channel along the [010] direction strongly limits its fast charge and discharge performance. Herein, lattice engineering is developed by the planar triangle BO<sub>3</sub> <sup>3-</sup> substitution on tetrahedron PO<sub>4</sub> <sup>3-</sup> to induce flexibility in the Li-ion diffusion channels, which are broadened simultaneously. The planar structure of BO<sub>3</sub> <sup>3-</sup> may further provide additional paths between the channels. With these synergetic contributions, LiFe(PO<sub>4</sub>)<sub>0.98</sub>(BO<sub>3</sub>)<sub>0.02</sub> shows the best performance, which delivers the high-rate capacity (66.8 mAh g<sup>-1</sup> at 50 C) and long cycle stability (ultra-low capacity loss of 0.003% every cycle at 10 C) at 25 °C. Furthermore, excellent rate performance (34.0 mAh g<sup>-1</sup> at 40 C) and capacity retention (no capacity loss after 2500 cycles at 10 C) at -20 °C are realized.