The commercialization of lithium manganese oxide (LMO) is seriously hindered by several drawbacks, such as low initial Coulombic efficiency, the degradation of the voltage and capacity during cycling, and the poor rating performance. Developing a simple and scalable synthesis for engineering with surface coating layers is significant and challenging for the commercial prospects of LMO oxides. Herein, we have proposed an efficient engineering strategy with a NbO coating layer. We dissolved niobate (V) ammonium oxalate hydrate and stoichiometric rich LMO (RLM) in deionized water and stirred constantly. Then, the target product was calcined at high temperature. The discharge capacity of the NbO coating RLM is increased from 195 mAh·g (the RLM without NbO) to 215 mAh·g at a coating volume ratio of 0.010. The average voltage decay was 4.38 mV/cycle, which was far lower than the 7.50 mV/cycle for the pure LMO. The electrochemical kinetics results indicated that the performance was superior with the buffer engineering by the NbO coating of RLM, which provided an excellent lithium-ion conduction channel, and improved diffusion kinetics, capacity fading, and voltage decay. This reveals the strong potential of the NbO coating in the field of cathode materials for lithium-ion batteries.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10179934 | PMC |
| http://dx.doi.org/10.3390/molecules28093890 | DOI Listing |
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Article Synopsis
- Raising the charging cut-off voltage in layered oxide cathodes can boost their energy density, but it leads to stability issues with their structure.
- A new approach using high-valence Nb elements creates a modified LiCoO with enhanced performance through a special coating that improves the cathode/electrolyte interface and enhances lithium diffusion.
- This innovative structure allows for stable operation at high voltages, and results in long-lasting lithium-ion cells that maintain over 87% capacity after numerous cycles, showcasing a promising method for developing high-energy, durable batteries.
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