NaTi2(PO4)3 modified O3-type NaNi1/3Fe1/3Mn1/3O2 as high rate and air stable cathode for sodium-ion batteries

NASICON-Type NaTi2(PO4)3 Surface Modified O3-Type NaNi0.3Fe0.2Mn0.5O2 for High-Performance Cathode Material for Sodium-Ion Batteries

“…Meanwhile, after further magnification (Figure 2d), two materials with different lattice stripes can be clearly observed. One of the lattice stripes with an adjacent spacing of 0.277 nm corresponds to the (006) crystal plane of O3-type NFM, 50 while the lattice stripes with an adjacent spacing of 0.352 nm are associated with the (113) crystal plane of NaTi 2 (PO 4 ) 3 . 35 These results clearly demonstrate that the NTP coating layer is well coated on the NFM material.…”

“…59 (2) The stable NTP coating layer can act as a physical barrier between the interfaces, which effectively reduces direct electrode−electrolyte contact and unfavorable side reactions, resulting in intact particles of the materials and less dissolution of transition metal elements. 50 (3) The O3−P3 phase transition is usually achieved by the slip of the transition metal layer, and the NTP coating layer on the NFM surface is equivalent to a resistance wall for the atoms on the NFM surface. It prevents the lateral movement of the transition metal layer, so that the materials maintain their original crystal structure.…”

“…The excellent electrochemical performance of the materials coated with the NTP coating layer arises from the following five aspects: (1) The partial doping of the NTP coating layer into the NFM matrix, for example, Ti 4+ into the transition metal layer can reduce the width of the transition metal layer and increase the width of the Na layer, thus increasing the stability of the crystal structure and reducing the resistance to Na + diffusion, as evidenced by the XRD results . (2) The stable NTP coating layer can act as a physical barrier between the interfaces, which effectively reduces direct electrode–electrolyte contact and unfavorable side reactions, resulting in intact particles of the materials and less dissolution of transition metal elements . (3) The O3–P3 phase transition is usually achieved by the slip of the transition metal layer, and the NTP coating layer on the NFM surface is equivalent to a resistance wall for the atoms on the NFM surface.…”

Practical Cathodes for Sodium‐Ion Batteries: Who Will Take The Crown?

“…[252] In addition, Na 2 SiO 3 and NaTi 2 (PO 4 ) 3 ion conductors with 3D Na-ion diffusion channels were developed to protect the host material and reduce the migration energy barrier, thereby improving the rate capability. [251,253] A new type of ionic conductor Na 3 Zr 2 Si 2 PO 12 coating was deposited on the NaNi 1/3 Mn 1/3 Fe 1/3 O 2 model cathode by a sol-gel process, followed by high-temperature calcination. [239] The protective coating provided fast Na-ion diffusion channels and reduced cracking and particle peeling.…”

Surface Engineering Based on Conductive Agent Dispersion Uniformity: Strategies toward Performance Consistency of Lithium-Ion Batteries

“…19−21 The electrical performance parameters such as the capacity, voltage, and cycle life of the battery pack are not only related to each lithium-ion battery but more importantly the consistency of each battery. 22,23 Poor consistency will greatly affect the performance of the battery pack. The production of electrodes is considered to be an important front-end process for lithium-ion batteries.…”