Acceleration of reaction kinetics is urgently pursued for high-rate sodium ion batteries, while the utilization of ferroelectric and piezoelectric effect to form local micro electric field to facilitate ion transport has rarely been reported. Herein, a coherent tin oxide/barium titanate heterostructure encapsulated inside nitrogen-doped carbon nanofibers (SnO₂/BaTiO₃@NCNF) is introduced as sodium ion battery anode, exhibiting high capacity retention (82% over 2000 cycles at 2 A·g¹) and stunning long-term cyclability (183.4 mAh·g¹ after 10000 cycles at 5 A·g¹). The local potential produced by piezoelectric and ferroelectric effect of BaTiO₃ (BTO) can boost sodium ion diffusion kinetics and promote rate performance of SnO₂ anode. The piezoelectric effect is initiated from exploiting the drawback of volume expansion of SnO₂, while the ferroelectric effect is originated from the charge separation of polarized BTO particles under external electric field. Such principle is instructive for alloying-type and convention-type anodes of alkali-ion batteries.

高倍率钠离子电池迫切需要加速反应动力学，而利用铁电和压电效应形成局部微电场以促进离子传输的报道很少。在此，引入了封装在氮掺杂碳纳米纤维（SnO ₂ /BaTiO ₃ @NCNF）内的相干氧化锡/钛酸钡异质结构作为钠离子电池阳极，表现出高容量保持率（2  A·g ^{1 下}2000 次循环中 82% ）和昏迷长期循环性能（183.4毫安·G ¹在5万次循环后 A·克¹）。BaTiO ₃压电效应和铁电效应产生的局部电位(BTO) 可以提高钠离子扩散动力学并提高 SnO ₂阳极的倍率性能。压电效应源于利用SnO ₂体积膨胀的缺点，而铁电效应源于极化BTO粒子在外电场作用下的电荷分离。该原理对碱离子电池的合金化和常规型阳​​极具有指导意义。