Detection of local chemical states of lithium and their spatial mapping by scanning transmission electron microscopy, electron energy-loss spectroscopy and hyperspectral image analysis

被引:45
作者
Muto, Shunsuke [1 ]
Tatsumi, Kazuyoshi [1 ]
机构
[1] Nagoya Univ, Inst Mat & Syst Sustainabil, Adv Measurement Technol Ctr, Chikusa Ku, Nagoya, Aichi 4648603, Japan
关键词
spectral image; lithium-ion battery; cathode active materials; non-negative matrix factorization; multi-variate curve resolution; first principles calculation; NONNEGATIVE MATRIX FACTORIZATION; CAPACITY-FADING MECHANISMS; ION BATTERIES; RESOLVED EELS; SPECTRUM IMAGES; ACTIVE MATERIAL; INFORMATION; RESOLUTION;
D O I
10.1093/jmicro/dfw038
中图分类号
TH742 [显微镜];
学科分类号
摘要
Advancements in the field of renewable energy resources have led to a growing demand for the analysis of light elements at the nanometer scale. Detection of lithium is one of the key issues to be resolved for providing guiding principles for the synthesis of cathode active materials, and degradation analysis after repeated use of those materials. We have reviewed the different techniques currently used for the characterization of light elements such as high-resolution transmission electron microscopy, scanning transmission electron microscopy ( STEM) and electron energy-loss spectroscopy (EELS). In the present study, we have introduced a methodology to detect lithium in solid materials, particularly for cathode active materials used in lithium-ion battery. The chemical states of lithium were isolated and analyzed from the overlapping multiple spectral profiles, using a suite of STEM, EELS and hyperspectral image analysis. The method was successfully applied in the chemical state analyses of hetero-phases near the surface and grain boundary regions of the active material particles formed by chemical reactions between the electrolyte and the active materials.
引用
收藏
页码:39 / 49
页数:11
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