environmentally stable interface of layered oxide cathodes for sodium-ion batteries - ess energy storage system
Sodium-
Ion batteries are the key strategy for mass production.
Scale energy storage.
Especially the layered oxide of manganese
The base oxide, due to its high reversible capacity and use of the Earth, is the most popular cathode
Rich elements.
However, it is rarely noted that the interface of the layered cathode is always affected by atmospheric and electrical corrosion, resulting in a serious decline in electrical performance.
Here, we present an environment-stable interface through the surface concentration of titanium, which not only overcomes the above limitations, but also demonstrates unique surface chemical/electro-chemical properties.
The results show that the atom-
The scale of the interface is made of magnesium aluminum spinelslike titanium (III)
Oxide, enhanced structural/electrical stability and electronic/ionic conductivity.
So interface-
The engineering electrode shows excellent cycling performance in all layered manganese
Based on the cathode, and highenergy density.
Our findings highlight the importance of a stable interface and provide an open opportunity for well design
Special cathode materials for sodium storage. Large-
Scale of energy storage system (ESS)
The smooth integration of renewable resources such as wind energy and solar energy into the grid is the key.
Among them, the electro-chemical method is considered as an intelligent choice, which effectively improves the reliability and utilization rate of the power grid.
Application cost, service life and efficiency should be the main focus of fixed batteries compared to power batteries.
In the past few decades, lithiumion batteries (LIBs)
This leads to a shortage of lithium resources and expensive costs.
In contrast, sodium is one of the most abundant elements on Earth.
The abundant reserves of sodium and the mechanism of insertion make sodiumion batteries (SIBs)
Ideal alternative for large LIBs
Scale applications.
Recently, a lot of efforts have been made in the development of cathode materials for SIBs, such as layered oxides, multi-ionic compounds and Prussian-blue analogs.
In a variety of cathode materials, NaTMO (
≤ u2009 1 TM u2009 = u2009 Mn nickel and. )
Based on rich materials, the cathode of SIBs, especially Mn-
Low base material
Spend fixing the battery without sacrificing energy density or safety.
Their low cost and high performance make the layered manganese-
Oxide-based SIBs are very promising cathode candidates and it is also possible to compete with LiCoO, I. e.
The most widely used system in LIBs.
Some main problems in layered manganesebased oxides: (1)
Due to the fragility of the layered Na-time interface, water or carbon dioxide can be easily inserted into the mezzanine
The oxide contained is exposed to the air. (2)
Chemical Activity Mn (III)
Related to it:2Mn→Mn+Mn)
Causes the Mn to dissolve from the cathode/electrolyte interface. (3)
The above two phenomena lead to serious degradation of the layered structure and rapid decline of reversible capacity.
Here we go through Ti-enrichment-
Induced surface reconstruction in NaMnTiNiO (NMTN). The Ti(III)-
Concentrated magnesium-aluminum spinels
Like an atomic layer.
The scale thickness shows a unique crystal and electronic structure that not only results in higher electronic and ionic conductivity, but also results in chemical/electro/thermal stability of the layered material.
In contrast, layered NaMnO (NM)
Display a typical phase change (O′3→Birnessite)
When exposed to air, the impedance increases with the circulation in the cell.
Therefore, the NMTN electrode has a high reversible capacity, excellent rate capability and excellent cycle capability, which indicates that this material is a very promising candidate for the SIBs cathode material.
This simple strategy will contribute to the development of the room
SIB technology for high temperatureEnergy and highpower density.