.png){kind=icon}
返回
Fluid-enhanced surface diffusion controls intraparticle phase transformations
.png){kind=icon}
PRE
AI
DOI：10.1038/s41563-018-0168-4.png)
.png){kind=icon}
.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
Phase transformations driven by compositional change require mass flux across a phase boundary. In some anisotropic solids, however, the phase boundary moves along a non-conductive crystallographic direction. One such material is LiXFePO4, an electrode for lithium-ion batteries. With poor bulk ionic transport along the direction of phase separation, it is unclear how lithium migrates during phase transformations. Here, we show that lithium migrates along the solid/liquid interface without leaving the particle, whereby charge carriers do not cross the double layer. X-ray diffraction and microscopy experiments as well as ab initio molecular dynamics simulations show that organic solvent and water molecules promote this surface ion diffusion, effectively rendering LiXFePO4 a three-dimensional lithium-ion conductor. Phase-field simulations capture the effects of surface diffusion on phase transformation. Lowering surface diffusivity is crucial towards supressing phase separation. This work establishes fluid-enhanced surface diffusion as a key dial for tuning phase transformation in anisotropic solids.
Keyword:
LITHIUM-ION BATTERIES
LIFEPO4 NANOPARTICLES
CATHODE MATERIALS
NONEQUILIBRIUM THERMODYNAMICS
ELECTROCHEMICAL PROPERTIES
LIXFEPO4
TRANSITION
ELECTRODES
SEPARATION
STABILITY
AI总结
对已上传原文的论文进行重点信息的提取，主要内容包括：简要概述、研究摘要、背景介绍、关键亮点、图文解析、展望与总结。
期刊
IF:
38.5
论文数:
6.8K
被引数:
12.2W
机构
引用论文
Atomic-scale investigation of defects, dopants, and lithium transport in the LiFePO4 olivine-type battery materialLiFePO4橄榄石型电池材料中缺陷，掺杂剂和锂传输的原子级研究
PREAI
分享收藏2D metal carbides and nitrides (MXenes) for energy storage用于储能的2D金属碳化物和氮化物 (MXenes).png)
NATURE REVIEWS MATERIALS
NATURE REVIEWS MATERIALSIF86.2
PREAI
分享收藏分享收藏Thermodynamic stability of driven open systems and control of phase separation by electro-autocatalysis驱动开放系统的热力学稳定性和电自动催化控制相分离FARADAY DISCUSSIONS
OAAI
FARADAY DISCUSSIONSIF3.1
OAAI分享收藏Li conductivity in LixMPO4 (M = Mn, Fe, Co, Ni) olivine materialsLixMPO4 (M = Mn，Fe，Co，Ni) 橄榄石材料中的Li电导率
PREAI
分享收藏Theory of Chemical Kinetics and Charge Transfer based on Nonequilibrium Thermodynamics基于非平衡热力学的化学动力学和电荷转移理论
OAAI
OAAI分享收藏
查看更多内容