Stabilized O3-Type Layered Oxide Cathode via High-Entropy Engineering
Stabilized O3-Type Layered Oxide Cathode via High-Entropy Engineering
研究概述
通过Ni/Fe/Mn近等摩尔活性组分与低含量Li/Mg/Ti/Sb掺杂，设计高熵O3钠电正极，扩大层间距、降低带隙及Na迁移势垒。原位XRD显示可逆O3–P3–OP2转变；1 C循环300次保持80.71%，5 C循环1000次保持80.09%。
谱图与表征信息
FIGURE 4 Charge compensation and electronic structure analysis. Ex situ XANES spectra at Ni (a), Fe (b), and Mn (c) K-edges for pristine, charged (4.0 V), and discharged (2.0 V) states, with reference compounds. (d–f) Corresponding Fourier-transformed EXAFS spectra. Calculated total density of states (TDOS) for (g) NFM and (h) HEO. Calculated projected density of states (PDOS) for (j) NFM and (k) HEO. (i) Schematic illustration of Na+ migration pathway. (l) Migration energy barrier calculations for Na+ diffusion.