Developing advanced electrode materials with enhanced charge-transfer kinetics is the key to realizing fast energy storage technologies. Commonly used modification strategies, such as nanoengineering and carbon coating, are mainly focused on electron transfer and bulk Li⁺ diffusion. Nonetheless, the desolvation behavior, which is considered as the rate-limiting process for charge-storage, is rarely studied. Herein, we designed a nitridation layer on the surface of Wadsley–Roth phase FeNb₁₁O₂₉ (FNO_–x@N) to act as a desolvation promoter. Theoretical calculations demonstrate that the adsorption and desolvation of solvated Li⁺ is efficiently improved at FNO_–x@N/electrolyte interphase, leading to the reduced desolvation energy barrier. Moreover, the nitridation layer can also help to prevent solvent cointercalation during Li⁺ insertion, leading to advantageous shrinkage of block area and reduced volume change of lattice cell during cycling. Consequently, FNO_–x@N exhibits a high-rate capacity of 129.7 mAh g^–1 with negligible capacity decay for 10 000 cycles.

中文翻译：

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具有促进脱溶剂化界面层的 Wadsley-Roth 相 Fe-Nb 氧化物的万周期超快储能

开发具有增强电荷转移动力学的先进电极材料是实现快速储能技术的关键。常用的修改策略，如纳米工程学和碳涂层，主要集中在电子转移和散装栗⁺扩散。尽管如此，被认为是电荷存储限速过程的去溶剂化行为很少被研究。在此，我们在 Wadsley-Roth 相 FeNb ₁₁ O ₂₉ (FNO _{– x} @N)的表面设计了一个氮化层，作为去溶剂化促进剂。理论计算表明，溶剂化 Li ⁺的吸附和去溶剂化在 FNO _{– x 下}得到有效改善@N/电解质中间相，导致去溶剂化能垒降低。此外，氮化层还有助于防止 Li ⁺插入过程中的溶剂共嵌入，从而导致嵌段面积的有利收缩并减少循环过程中晶格电池的体积变化。因此，FNO _{– x} @N 表现出 129.7 mAh g ^–1的高倍率容量，10 000 次循环的容量衰减可以忽略不计。