Dong Jun, Chen Zilun, Wang Jiajing, Jiang Yalong, Ao Jian, Wang Ruxing, Pan Jianxin, Wei Qiulong, Zhang Xiaoxing
Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System, Hubei University of Technology, Wuhan 430068, P. R. China.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, P. R. China.
ACS Nano. 2025 Mar 18;19(10):10337-10346. doi: 10.1021/acsnano.4c18215. Epub 2025 Mar 5.
High-power sodium-ion batteries are essential for grid energy storage; however, they are generally limited by Na transport. Herein, we tailor a highly matched heterostructure (MgTiO@NaTiO) via a facile in situ synthesis method. The similar crystal structures of NaTiO and MgTiO creat continuous Na diffusion channels at the heterointerface, and the interactions at the interface creat a built-in interface electric field with a direction from MgTiO to NaTiO. As a result, the particular heterointerface enable rapid Na diffusion in the MgTiO@NaTiO electrode. The heterostructure engineering regulate the electrochemical reaction mechanism, leading to the solid solution reaction in the MgTiO@NaTiO electrode, facilitating rapid Na transport. Therefore, the MgTiO@NaTiO electrode exhibits an excellent rate capability (123 mAh/g at 20 C) and cycling performance. This work highlights the importance of a heterointerface with continuous channels in overcoming Na transport limitations in electrodes and could serves as a guide for designing a heterointerface for high-power sodium-ion batteries.
高功率钠离子电池对于电网储能至关重要；然而，它们通常受到钠传输的限制。在此，我们通过一种简便的原位合成方法定制了一种高度匹配的异质结构（MgTiO@NaTiO）。NaTiO和MgTiO相似的晶体结构在异质界面处形成了连续的钠扩散通道，并且界面处的相互作用产生了一个从MgTiO到NaTiO方向的内置界面电场。结果，这种特殊的异质界面使得钠在MgTiO@NaTiO电极中能够快速扩散。异质结构工程调控了电化学反应机制，导致MgTiO@NaTiO电极中发生固溶体反应，促进了钠的快速传输。因此，MgTiO@NaTiO电极表现出优异的倍率性能（20 C时为123 mAh/g）和循环性能。这项工作突出了具有连续通道的异质界面在克服电极中钠传输限制方面的重要性，并可为高功率钠离子电池异质界面的设计提供指导。
