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Unravelling structural ambiguities in lithium- and manganese-rich transition metal oxides.
Nature Communications ( IF 14.7 ) Pub Date : 2015-Oct-29 , DOI: 10.1038/ncomms9711
Alpesh Khushalchand Shukla , Quentin M. Ramasse , Colin Ophus , Hugues Duncan , Fredrik Hage , Guoying Chen

Although Li- and Mn-rich transition metal oxides have been extensively studied as high-capacity cathode materials for Li-ion batteries, the crystal structure of these materials in their pristine state is not yet fully understood. Here we apply complementary electron microscopy and spectroscopy techniques at multi-length scale on well-formed Li1.2(Ni0.13Mn0.54Co0.13)O2 crystals with two different morphologies as well as two commercially available materials with similar compositions, and unambiguously describe the structural make-up of these samples. Systematically observing the entire primary particles along multiple zone axes reveals that they are consistently made up of a single phase, save for rare localized defects and a thin surface layer on certain crystallographic facets. More specifically, we show the bulk of the oxides can be described as an aperiodic crystal consisting of randomly stacked domains that correspond to three variants of monoclinic structure, while the surface is composed of a Co- and/or Ni-rich spinel with antisite defects.

中文翻译:

消除富含锂和锰的过渡金属氧化物的结构歧义。

尽管已经广泛研究了富锂和富锰的过渡金属氧化物作为锂离子电池的高容量阴极材料,但是这些材料在其原始状态下的晶体结构尚未完全被理解。在这里,我们将多长度尺度的互补电子显微镜和光谱技术应用于具有两种不同形态的结构良好的Li1.2(Ni0.13Mn0.54Co0.13)O2晶体以及具有相似组成的两种市售材料,并进行了明确描述这些样品的结构组成。系统地观察沿多个区域轴的整个一次粒子,发现它们始终由一个单相组成,除了罕见的局部缺陷和某些结晶面上的薄表层。进一步来说,
更新日期:2015-11-01
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