(a) Na- and (b) NaCO3- signal depth curves of NaFC and NaFCMT samples after aging; Depth curves of NaNM and NaNMT (a) Na- and (b) NaCO3- signals after aging. Spontaneous removal of sodium from active crystal lattice will directly lead to a sharp decrease in first-ring charging capacity. Therefore, the air stability of PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC can be directly seen through the comparison of first-ring electrochemistry.
After exposure to air for 5 days, NaFC and NaNM could only maintain 80.6% and 58.0% of the first charge capacity of fresh samples, but the modified NaFCMT and NaNMT could achieve 91.3% and 93.8% of the first charge retention. The in-situ XRD patterns of the first circle charge and discharge process of NaFCMT and NaNMT show that the PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC transformation process experienced by NaFCMT and NaNMT during charge and discharge process is completely reversible.
The results of projection state density calculation show that Fe/Co or Ni/Mn elements and oxygen orbitals have strong hybridization and form strong covalent bonds. Mg2+ and Ti4+ have no electronic states near the Fermi level and have weak interaction with the oxygen layer. This weaker Tm-O interaction leads to the growth of transition metal and oxygen bond after removal of iron by PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC, as well as more charge transfer from sodium atom to oxygen, forming stronger Na-O binding.
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