Facilitated Coating of Li₃PO₄ on the Rough Surface of LiNi_0.85Co_0.1Mn_0.05O₂ Cathodes by Synchronous Lithiation

Abstract

Ni-rich cathode materials used in power cells have attracted great attention on account of their higher specific capacity at a lower price. Nevertheless, their inherent shortcomings suppress their large-scale commercial applications. Therefore, a LiNi0.85Co0.1Mn0.05O2 cathode material with a uniform Li3PO4 coating is designed and fabricated successfully through a facile synchronous lithiation process. The morphology and structure of these materials are detected by field emission scanning electron microscopy (FESEM), energy-dispersive X-ray (EDX) spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray powder diffraction (XRD). The electrochemical performance with different coating amounts is also studied in detail. The results obtained using the above techniques prove that a uniform coating layer with moderate thickness could result in an enhanced initial Coulombic efficiency (ICE) of 89.1%, a promising capacity retention of 94.3%, and a favorable rate performance of 80.0 mA h·g–1 at 10C rate.

Boosting Electrochemical Performance of Lithium-Rich Manganese-Based Cathode Materials through a Dual Modification Strategy with Defect Designing and Interface Engineering

“…To explore the crystal structure of the as-obtained materials, X-ray diffraction (XRD) is carried out. It can be seen from Figure a that the LMNC, CN-LMNC, and PCN-LMNC samples all display sharp diffraction peaks, which can be precisely assigned to a rhombohedral LiTMO 2 phase ( R 3̅ m space group) and a monoclinic Li 2 MnO 3 component ( C 2/ m space group) . The corresponding crystal structure schematics of LiTMO 2 and Li 2 MnO 3 are displayed in Figure b,c, and both of them show a well-layered structure.…”

“…It can be seen from Figure 2a that the LMNC, CN-LMNC, and PCN-LMNC samples all display sharp diffraction peaks, which can be precisely assigned to a rhombohedral LiTMO 2 phase (R3̅ m space group) and a monoclinic Li 2 MnO 3 component (C2/m space group). 36 The corresponding crystal structure schematics of LiTMO 2 and Li 2 MnO 3 are displayed in Figure 2b,c, and both of them show a well-layered structure. Besides, all samples display the obvious separation of (006)/(012) and (018)/ (110) peaks, indicating a stable and well-ordered layered structure.…”

Li<bold>3</bold>PO<bold>4</bold> Coated Li[Ni<bold>0.75</bold>Co<bold>0.1</bold>Mn<bold>0.15</bold>]O<bold>2</bold> Cathode for All-Solid-State Batteries Based on Sulfide Electrolyte

“…To address this issue, we manufactured Li 3 PO 4 coated cathodes using two types of source materials, namely, polyphosphoric acid (PPA) and (NH 4 ) 2 HPO 4 , and compared their physical morphologies and electrochemical performances. (NH 4 ) 2 HPO 4 is generally used as a source material for Li 3 PO 4 coating of cathodes [18][19][20]. Li 3 PO 4 coated cathodes prepared using (NH 4 ) 2 HPO 4 have shown enhanced electrochemical performance compared with uncoated cathodes in LIBs, presenting a positive coating effect.…”

Elucidating the Effect of the Dopant Ionic Radius on the Structure and Electrochemical Performance of Ni-Rich Layered Oxides for Lithium-Ion Batteries

“…The released oxygen in the form of singlet oxygen inclines to decompose the electrolyte and renders the formation of the cathode–electrolyte interphase layer on the cathode surface . Strategies for limiting the impact of structural and interfacial degradations have been developed over the decades, including surface modification, atomic substitution, and structural tailoring of Ni-rich layered oxide materials. , …”

“…7 Strategies for limiting the impact of structural and interfacial degradations have been developed over the decades, including surface modification, atomic substitution, and structural tailoring of Ni-rich layered oxide materials. 8,9 Cation doping is one of the most dominant approaches for enhancing the cycling performance of Ni-rich oxide cathodes, which can effectively suppress the phase transition and stabilize the lattice oxygen. 10 Intensive previous studies have been implemented by selecting different cations, such as Na + , Mg 2+ , Al 3+ , Y 3+ , Zr 4+ , Nb 5+ , and Ta 5+ , which are all proven to be effective in improving the cycling stability.…”