Na-ion Battery Applications Research Articles

Synthesis and Characterization of Na3+xMxZr2-xSi2PO12 for Solid State Na-Ion Battery Applications

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An aniline-nitroaniline copolymer as a high capacity cathode for Na-ion batteries

An aniline/o-nitroaniline copolymer was prepared simply by grafting electron-withdrawing o-nitroaniline groups onto polyaniline chains through a chemical oxidative polymerization and tested as a high voltage cathode material for Na-ion batteries. The experimental results demonstrated that the as-prepared P(AN-NA) can deliver a reversible capacity of 180 mAh g−1 at an average potential of ~3.2V ( vs. Na+/Na ) and remain 173 mAh g−1 after 50 cycles, showing a high potential capability and a strong capacity retention. In addition, the copolymer is low cost and easy to make, possibly serving as a cycling-stable and high capacity cathode for practical Na-ion battery applications.

Synthesis, Structure, and Electrochemical Properties of the Layered Sodium Insertion Cathode Material: NaNi1/3Mn1/3Co1/3O2

A layered phase, NaNi1/3Mn1/3Co1/3O2 (NaNMC), isostructural to NaCoO2 has been synthesized. Stoichiometric NaNMC crystallizes in a rhombohedral R3m space group where Na is in an octahedral environment (O3-Type). Galvanostatic cycling on NaNMC vs Na cell indicated a reversible intercalation of 0.5 Na, leading to a capacity of 120 mAh·g–1 in the voltage range of 2–3.75 V and indicating its possible application in Na-ion batteries. The electrochemically driven Na insertion/deinsertion in NaNMC is associated with several phase transitions and solid solution regimes which are studied by in situ X-ray diffraction. Sodium deinsertion in NaxNMC resulted in sequential phase transitions composed of biphasic and monophasic domains. The composition driven structural evolution in NaxNMC follows the sequence O3 ⇒ O1 ⇒ P3 ⇒ P1 phases with an increased ‘c’ parameter, while the ‘a’ parameter remains almost unchanged.

High capacity, reversible alloying reactions in SnSb/C nanocomposites for Na-ion battery applications

A new SnSb/C nanocomposite based on Na alloying reactions is demonstrated as anode for Na-ion battery applications. The electrode can achieve an exceptionally high capacity (544 mA h g(-1), almost double that of intercalation carbon materials), good rate capacity and cyclability (80% capacity retention over 50 cycles) for Na-ion storage.