Mechanical Stress Relief and Na+ Diffusion Enhancement via Bond Tuning and Vacancy Disorder in Low-Sodium O3 Cathodes
Mechanical Stress Relief and Na+ Diffusion Enhancement via Bond Tuning and Vacancy Disorder in Low-Sodium O3 Cathodes
研究概述
采用低钠含量及高熵掺杂构筑O3层状正极，通过空位无序改善Na⁺扩散，并以Ti—O键增强骨架、减缓层间滑移和应力。体积变化仅1.68%，按正极计能量密度427.36 Wh/kg；1 A/g循环1000次保持80.40%，工作温区−30至60 ℃。
谱图与表征信息
Figure 3. Electronic structure and charge compensation mechanism. (a) Ti 2p, (b) Cu 2p, and (c) Mn 2p XPS spectra of HE-NNMO at various electrochemical states. (d,e) Ex situ XANES spectra and (f,g) Fourier-transformed EXAFS spectra of Fe K-edge, and Ni K-edge at pristine, fully charged (4.2 V), and fully discharged (2.0 V) states; insets show the magnified spectra. Contour plots of the (h) Fe and (i) Ni K-edge WT-EXAFS spectra at different charged and discharged states.