Supporting Information for “Enhanced Electrochemical Performances of Nirich Cathode Materials for Lithium-ion Batteries by Mixed Coating Layers"

The properties exhibited by Ni-rich cathode materials were enhanced through the mixed coating layers of Li3PO4 and boric acid. The scanning electron microscopy (SEM), the transmission electron microscope (TEM), the differential scanning calorimetry (DSC), the Electrochemical Impedance Spectroscopy (EIS), as well as the half-cell and full-cell charge-discharge tests were adopted for characterizing the structure and electrochemical properties exhibited by the cathode materials. As revealed by results, the Li3PO4 and boric mixed coating layers can effectively reduce the surface area and protect the direct contact between cathode material particle surface and electrolyte, meanwhile improving the structural stability and cycle performance. The coating of fast ionic conductor contributes to enhance the specific capacity possessed by the Ni-rich cathode materials accordingly.

富含镍的负极材料之特性，经锂磷酸盐与硼酸混合涂层层的处理而得到显著提升。本研究采用了扫描电子显微镜（SEM）、透射电子显微镜（TEM）、差示扫描量热法（DSC）、电化学阻抗谱（EIS）以及半电池与全电池充放电测试等多种手段，对负极材料的结构及电化学性质进行了详尽的表征。研究结果表明，锂磷酸盐与硼酸的混合涂层层能有效降低表面积，保护负极材料颗粒表面与电解液之间的直接接触，同时提升结构稳定性和循环性能。此外，快速离子导体涂层的施加亦有助于增强富含镍的负极材料的比容量。