Surface to Bulk Synergetic Modulation of Nickel-Rich LiNi
Surface to Bulk Synergetic Modulation of Nickel-Rich LiNi
研究概述
以植酸处理高镍NCM83正极，形成外层磷酸锂、亚表层NiO和体相磷梯度分布的三重结构，改善锂传输及H2–H3相变可逆性。在2.8–4.45 V、1 C循环300次后容量保持率72.4%；45℃循环200次后保持69.8%。
谱图与表征信息
Figure 1. Surface to bulk synergetic modulation of Ni-rich cathode materials with phytic acid. a) Schematic illustration for the synthesis of surfacemodified PA-NCM with a hierarchical surface structure, including an amorphous Li3PO4/Li4P2O7 outmost layer (I), a self-reconstructed NiO subsurface layer (II), and a gradient P doping in NCM bulk (III). b) Enlarged view of (006/102, 018/110) and (003) diffraction peaks of P-NCM, 0.5PA-NCM, PA- NCM, and 2PA-NCM. c) SEM images of P-NCM, 0.5PA-NCM, PA-NCM, and 2PA-NCM. d) 31P ssNMR of PA-NCM sample. e) XPS spectra of P-NCM and PA-NCM samples: P 2p, O 1s, and Ni 2p. f) XANES spectra of Ni K-edge of P-NCM and PA-NCM.