Li Shaoxiong, Chen Dongping, Tian Shengji, Zhang Chu, He Weidong, Lv Chade, Yan Chunshuang
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, State Key Laboratory of Space Power-Sources, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, and Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China; Chongqing Research Institute, Harbin Institute of Technology, Chongqing 401151, China; School of Mechanical Engineering, Chengdu University, Chengdu 610106, China.
J Colloid Interface Sci. 2025 Nov 15;698:138106. doi: 10.1016/j.jcis.2025.138106. Epub 2025 Jun 6.
Manganese-based hexacyanoferrate has garnered unprecedented attention for sodium-ion batteries due to their high theoretical capacity. However, the structural strain associated with Jahn-Teller distortion incurs fast capacity decline and poor rate capability. Effectively reconciling the trade-off between low-strain and rapid-kinetics in manganese-based hexacyanoferrate cathode poses a considerable challenge. Herein, an elegant strategy based on the stress engineering of heterointerface on nickle-doped manganese hexacyanoferrate@nickle hexacyanoferrate core@shell cathode is proposed to balance the volume strain and charge transfer kinetics during charge/discharge process. As evidenced by the operando X-ray diffraction experiments, differential electrochemical mass spectrometry, and theoretical calculations, the interfacial stress can be regulated by precisely tailoring the shell thickness to stabilize the built-in electric field, which ensures the good structural stability and fast charge diffusion kinetics. Consequently, the as-developed cathode delivers a reversible capacity of 81.0 mAh g, excellent cycling stability (81.9 % of capacity retention after 800 cycles), and superior rate performance (55.1 mAh g at 10 C). Our work heralds a promising strategy of heterointerface strain engineering for exploring advanced MnHCFs cathode materials toward high-performance sodium storage.
基于锰的六氰合铁酸盐因其高理论容量而在钠离子电池领域获得了前所未有的关注。然而，与 Jahn-Teller 畸变相关的结构应变会导致容量快速下降和倍率性能不佳。有效协调基于锰的六氰合铁酸盐阴极中低应变与快速动力学之间的权衡是一项重大挑战。在此，我们提出了一种基于镍掺杂锰六氰合铁酸盐@镍六氰合铁酸盐核壳阴极异质界面应力工程的巧妙策略，以平衡充放电过程中的体积应变和电荷转移动力学。通过原位 X 射线衍射实验、差分电化学质谱和理论计算证明，通过精确调整壳层厚度可以调节界面应力，以稳定内建电场，从而确保良好的结构稳定性和快速的电荷扩散动力学。因此，所开发的阴极具有 81.0 mAh g 的可逆容量、出色的循环稳定性（800 次循环后容量保持率为 81.9%）和优异的倍率性能（10 C 下为 55.1 mAh g）。我们的工作为探索用于高性能钠存储的先进 MnHCFs 阴极材料开辟了一种有前景的异质界面应变工程策略。
