高比能二次电池正极材料的X射线谱学研究进展

陈淑媛, 程晨, 夏啸, 鞠焕鑫, 张亮

Research progress in the X-ray spectroscopy investigation of cathode materials for high-energy-density secondary batteries

Shuyuan CHEN, Chen CHENG, Xiao XIA, Huanxin JU, Liang ZHANG

图4 (a) NMMO在不同带电状态下的归一化Mn K边XANES光谱[71]；(b) NNMO和CTO@NNMO在第1次和第100次充放电状态下的Mn L边XANES光谱和定量拟合结果[73]；(c) Air-NMM和Ar-NMM的Mn K边傅里叶变换EXAFS谱[75]；(d) 由EXAFS分析得出的Ni-O和Mn-O配位数的变化和TM的迁移途径[76]；(e) Fe-N3C2-C、Fe-N4-C、Fe2O3 和Fe箔的WT图[77]；(f) Na x LMNMT的Ni、Mn K边的原位XANES光谱[78]；(g) 一系列Ti K边XANES，钛酸锂中Li嵌入过程中Li4/3Ti5/3O4 频谱加权函数随光谱指纹归一化幅度的演变以及锂化驱动的结构转变的演变[79]

Fig. 4 (a) Normalized Mn K-edge XANES spectra of NMMO at different charged states[71]; (b) Mn L-edge XANES spectra and quantitative fitting results of NNMO and CTO@NNMO at the fully charged and discharged states of the 1st and 100th cycle[73]; (c) Mn K-edge Fourier-transformed EXAFS spectra of Air-NMM and Ar-NMM[75]; (d) Variation of Ni-O and Mn-O coordination numbers derived from EXAFS analysis and the pathway of TM migration[76]; (e) WT plots of Fe- N3C2-C, Fe-N4-C, Fe2O3, and Fe foil[77]; (f) In situ XANES spectra at the Ni and Mn K-edge of Na x LMNMT[78]; (g) Series of Ti K-edge XANES, Evolution of the spectral weight of Li4/3Ti5/3O4 phase against normalized amplitude of spectral fingerprints during Li intercalation in lithium titanate and lithiation-driven structural transformations[79]