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<p>The interface between the electrolyte and electrode critically influences the overall electrochemical performance of solid-state lithium-ion batteries. Poor interfacial contact often leads to increased resistance and deteriorated ionic transport across the interface, which hinders the efficient transport of lithium ions and consequently leads to inferior cycling performance. In this work, we propose a strategy in which a composite electrode powder (40% LiFePO<sub>4</sub> and 60% Li<sub>1.3</sub>Al<sub>0.3</sub>Ti<sub>1.7</sub>(PO<sub>4</sub>)<sub>3</sub>(LATP)) is placed on a pre-sintered LATP electrolyte and subsequently co-sintered using rapid hot-press sintering. This approach takes advantage of the accelerated sintering kinetics to construct a highly stable cathode/electrolyte interface. From the results, no interface layer was observed at the interface for the rapid heating and cooling process which effectively curbs elemental cross-diffusion. Consequently, the interfacial impedance of the co-sintered sample was significantly reduced to 1806 <i>Ω</i>·cm<sup>2</sup> at 25&#xa0;℃, compared with 3014 <i>Ω</i>·cm<sup>2</sup> for the conventionally assembled LATP/LFP cell, indicating an enhanced ionic transport across the interface. Additionally, the battery with the co-sintered LATP/LFP retained 74.44% of its initial capacity after 100 cycles at 0.2C, representing a 60% improvement compared to the conventionally assembled counterpart. This approach constructs a highly stable electrode/electrolyte interface, which overcomes the major obstacle of solid–solid insufficient contact and therefore improves the conduction of lithium ions significantly.</p>

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Enhancing interfacial stability of LATP/LiFePO4 in all-solid-state batteries through fast kinetics by rapid hot-press sintering

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Chao Huang,
  • Shaoting Jia,
  • Yongcheng Ma,
  • Yue Yang

摘要

The interface between the electrolyte and electrode critically influences the overall electrochemical performance of solid-state lithium-ion batteries. Poor interfacial contact often leads to increased resistance and deteriorated ionic transport across the interface, which hinders the efficient transport of lithium ions and consequently leads to inferior cycling performance. In this work, we propose a strategy in which a composite electrode powder (40% LiFePO4 and 60% Li1.3Al0.3Ti1.7(PO4)3(LATP)) is placed on a pre-sintered LATP electrolyte and subsequently co-sintered using rapid hot-press sintering. This approach takes advantage of the accelerated sintering kinetics to construct a highly stable cathode/electrolyte interface. From the results, no interface layer was observed at the interface for the rapid heating and cooling process which effectively curbs elemental cross-diffusion. Consequently, the interfacial impedance of the co-sintered sample was significantly reduced to 1806 Ω·cm2 at 25 ℃, compared with 3014 Ω·cm2 for the conventionally assembled LATP/LFP cell, indicating an enhanced ionic transport across the interface. Additionally, the battery with the co-sintered LATP/LFP retained 74.44% of its initial capacity after 100 cycles at 0.2C, representing a 60% improvement compared to the conventionally assembled counterpart. This approach constructs a highly stable electrode/electrolyte interface, which overcomes the major obstacle of solid–solid insufficient contact and therefore improves the conduction of lithium ions significantly.