Fabrication of TiO₂ coated porous CoMn₂O₄ submicrospheres for advanced lithium-ion anodes

Abstract

Uniform CoMn2O4@TiO2 porous nanospheres have been developed with excellent electrochemical performance when evaluated as anode materials for lithium ion batteries.

Electrochemical Performance and Elevated Temperature Properties of the TiO2-Coated Li[Ni0.8Co0.1Mn0.1]O2 Cathode Material for High-Safety Li-Ion Batteries

“…In Figure b, the electron binding energies of 854.0 and 872.1 eV relate to Ni 2p 3/2 and Ni 2p 1/2 of the NCM811 cathode material. Ni 2p 3/2 can be well fitted by two peaks at 853.5 and 855.2 eV, assigning to Ni 2+ and Ni 3+ , respectively. − Also, the detected peaks of Co 2p 3/2 , Co 2p 1/2 , and Ni (LMM) in Figure c are recorded at binding energies of 779.4, 782.7, and 795.1 eV, demonstrating that the Co ions in the crystal lattice are mainly trivalent. ,, Moreover, the electron binding energies of Mn 2p 3/2 and Mn 2p 1/2 appear at 641.8 and 653.4 eV (Figure d), indicating that the Mn ions are mainly presented as Mn 4+ . , It is noteworthy to mention that the similar binding energies of Ni, Co, and Mn XPS peaks of the pristine and TiO 2 -coated NCM cathodes indicate that the surface valence states and crystal structure of the active cathode material have not changed during the coating process. , Binding energies of Ti 2p 3/2 and Ti 2p 1/2 at 458.4 and 464.2 eV of the surface-modified cathode are associated with the Ti spectrum of TiO 2 NPs (Figure e) and show that the Ti element is tetravalent. , …”

“…47,48 Binding energies of Ti 2p 3/2 and Ti 2p 1/2 at 458.4 and 464.2 eV of the surfacemodified cathode are associated with the Ti spectrum of TiO 2 NPs (Figure 3e) and show that the Ti element is tetravalent. 49,50 The morphology of the active material is characterized by quasi-spherical-shaped particles of 10−15 microns in diameter, formed by the accumulation of many polyhedral particles (Figure 4a,b). EDX elemental mapping of Ni, Mn, Co, and O of a synthesized NCM811 particle (Figure 4b−f) exhibits the uniform distribution of the cathode constituents.…”

Promoting Electrocatalytic Oxygen Reduction in a Model Composite Using Selective Metal Ions

“…36 The Co 2p spectrum shows two major peaks with binding energy values at 781.7 and 797.2 eV assigned to the Co 2p 3/2 and Co 2p 1/2 , respectively. 37 Further, relatively broad peaks at 786.3 and 803 eV designated to a higher proportion of Co(II) and partial amount of Co(III) ions 38 are shown in the SI, Section S13. The existence of Co(III) ions presumably results from surface oxidation of Co(II) species.…”

Metal–Oleate Complex-Derived Bimetallic Oxides Nanoparticles Encapsulated in 3D Graphene Networks as Anodes for Efficient Lithium Storage with Pseudocapacitance

“…In addition to that, manganese in its oxide form not only possesses an extremely low operating voltage [20][21][22], but is also a plentiful and low-cost material which is beneficial for practical implementation [23,24]. Interestingly, bimetallic oxides, such as CoMn 2 O 4 [25], MnCo 2 O 4 [26], ZnCo 2 O 4 [27], ZnFe 2 O 4 [28], exhibit excellent electrochemical performance owing to their complementarity and synergetic effect during the charge and discharge processes. In addition, graphene is one of the most promising templates used for supporting nanoparticles for application in LIBs [29,30].…”