Carbon-Coated Honeycomb Ni-Mn-Co-O Inverse Opal: A High Capacity Ternary Transition Metal Oxide Anode for Li-ion Batteries

Abstract

We present the formation of a carbon-coated honeycomb ternary Ni-Mn-Co-O inverse opal as a conversion mode anode material for Li-ion battery applications. In order to obtain high capacity via conversion mode reactions, a single phase crystalline honeycombed IO structure of Ni-Mn-Co-O material was first formed. This Ni-Mn-Co-O IO converts via reversible redox reactions and Li2O formation to a 3D structured matrix assembly of nanoparticles of three (MnO, CoO and NiO) oxides, that facilitates efficient reactions with Li. A carbon coating maintains the structure without clogging the open-worked IO pore morphology for electrolyte penetration and mass transport of products during cycling. The highly porous IO was compared in a Li-ion half-cell to nanoparticles of the same material and showed significant improvement in specific capacity and capacity retention. Further optimization of the system was investigated by incorporating a vinylene carbonate additive into the electrolyte solution which boosted performance, offering promising high-rate performance and good capacity retention over extended cycling. The analysis confirms the possibility of creating a ternary transition metal oxide material with binder free accessible open-worked structure to allow three conversion mode oxides to efficiently cycle as an anode material for Li-ion battery applications.

A Flexible Film toward High‐Performance Lithium Storage: Designing Nanosheet‐Assembled Hollow Single‐Hole Ni–Co–Mn–O Spheres with Oxygen Vacancy Embedded in 3D Carbon Nanotube/Graphene Network

“…It is worth noting that the original cathodic/anodic peaks shift to higher potentials, which could reduce the electrode polarization and enhance the charge transfer kinetics after the activation in the first scan . The redox peaks of the CV curves of the C‐NHNCM and C‐NHSNCM‐P electrodes show typical electrochemical characteristics of Ni–Co–Mn oxide electrodes exactly as the above CV curves (Figure S9, Supporting Information) …”

“…During the subsequent anodic scan, three continuous peaks are observed at 1.75, 1.97, and 2.25 V, which are associated with the oxidation to MnO, NiO, and CoO, respectively. Furthermore, the anodic peak at 1.33 V may be ascribed to the decomposition of Li 2 O . From the second cycle onward, the two sharp reduction peaks disappear and a very broad peak at around 0.5 V emerges.…”

“…Obviously, the first cycle shows difference from the following cycles which overlap well with each other. For the initial cathodic scan, two distinct peaks at 0.29, 0.49 V, and a small peak at 1.08 V are shown, corresponding to the gradual reduction of Ni–Mn–Co–O to Ni 0 , Mn 0 , Co 0 , and the formation of Li 2 O and solid‐electrolyte interphase (SEI) layer . During the subsequent anodic scan, three continuous peaks are observed at 1.75, 1.97, and 2.25 V, which are associated with the oxidation to MnO, NiO, and CoO, respectively.…”

V2O3 Polycrystalline Nanorod Cathode Materials for Li‐Ion Batteries with Long Cycle Life and High Capacity Retention

“…The specific capacity values and the C‐rate values presented were calculated in terms of the mass of the cathode. The OCV for the V 2 O 3 poly‐NRs half cells was ∼3.6 V (vs Li/Li + ), however the OCV for the V 2 O 3 poly‐NRs/ Co 3 O 4 IO cell the OCV was ∼2.6 V. Due to this decrease in the OCV, the potential window used for the full cell was 3.0–0.2 V. We have previously reported a similar shift in potential window for V 2 O 5 IO/Co 3 O 4 IO full cells and V 2 O 5 IO/Ni−Mn‐Co−O IO full cells …”

Mn substituted MnxZn1−xCo2O4 oxides synthesized by co-precipitation; effect of doping on the structural, electronic and magnetic properties

“…This shows that the Co 3+ content is slightly higher than in similar oxide systems. 40,41 At the same time, the centroid of the satellite doublet shis to 4 eV higher binding energy and becomes much narrower when moving from MnCo 2 O 4 to Zn 0.7 Mn 0.3 Co 2 O 4 .…”