ALBA Synchrotron Light Facility, Carrer de la Llum 2-26, 08290 Cerdanyola del Vallés, Barcelona, Spain.
Phys Chem Chem Phys. 2018 Jun 6;20(22):15288-15292. doi: 10.1039/c8cp00716k.
We have investigated the nanostructuring effects on the local structure of V2O5 cathode material by means of temperature dependent V K-edge X-ray absorption fine structure measurements. We have found that the nanostructuring largely affects V-O and V-V bond characteristics with a general softening of the local V-O and V-V bonds. The obtained bond strengths correlate with the specific capacity shown by the different systems, with higher capacity corresponding to softer atomic pairs. The present study suggests the key role of local atomic displacements in the diffusion and storage of ions in cathodes for batteries, providing important information for designing new functional materials.
我们通过温度依赖的 V K 边 X 射线吸收精细结构测量研究了纳米结构对 V2O5 正极材料局部结构的影响。我们发现，纳米结构化在很大程度上影响了 V-O 和 V-V 键的特性，导致局部 V-O 和 V-V 键普遍软化。所得到的键强度与不同系统表现出的比容量相关联，具有更高容量的系统对应于更软的原子对。本研究表明，在电池的阴极中，局部原子位移在离子的扩散和存储中起着关键作用，为设计新型功能材料提供了重要信息。
