期刊
ACS NANO
卷 7, 期 12, 页码 10887-10894出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn4043964
关键词
LiFePO4; LFP; electron microscopy; EFSD; t-EBSD; TKD; phase mapping; heterogeneities
类别
资金
- French ANR project AMOS
- Carnot project Vehy-Loco
LiFePO4 and FePO4 phase distributions of entire cross-sectioned electrodes with various Li content are investigated from nanoscale to mesoscale, by transmission electron microscopy and by the new electron forward scattering diffraction technique. The distributions of the fully delithiated (FePO4) or lithiated particles (LiFePO4) are mapped on large fields of view (>100 x 100 mu m(2)). Heterogeneities in thin and thick electrodes are highlighted at different scales. At the nanoscale, the statistical analysis of 64 000 particles unambiguously shows that the small particles delithiate first. At the mesoscale, the phase maps reveal a core-shell mechanism at the scale of the agglomerates with a preferential pathway along the electrode porosities. At larger scale, lithiation occurs in thick electrodes stratum by stratum from the surface in contact with electrolyte toward the current collector.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据