About this Engineering article
Discharge State of Layered P2-Type Cathode Reveals Unsafe than Charge Condition in Thermal Runaway Event for Sodium-Ion Batteries by Manikandan Palanisamy; Venkata Rami Reddy Boddu; Parasharam M. Shirage; Vilas G. Pol is a Engineering article available to read on EtoBox.
A sol-gel process followed by heat treatment derived a layered P2-type NaCoO 2 cathode, which depicted unit cell parameters values of a = 2.8389 Å, c = 10.9899 Å, and V = 76.71 Å 3 in powder X-ray diffraction pattern. The synthesized cathode exhibited hexagonal, 2D platelets with an ∼300 nm thickness. During the anodic and cathodic sweeps, the cyclic voltammograms revealed multiple redox peaks with the same current densities, shapes, and peak positions, associated with the highly reversible phase transition mechanism of the layered P2-type NaCoO 2 cathode. The sodium cells yielded the capacities of 93/92 mAh g -1 at 0.5 C and 87/87 mAh g -1 at 1 C for the 50th charge-discharge cycles. The in situ multimode calorimetry (MMC) studies of sodium cells demonstrated a thermal explosion event, which occurred by sodium melting, short-circuit, electrode decomposition reaction, gas generation, exothermic reaction, released heat energy ,and cell gasket melting. Ultimately, the calculated released total heat energies of ∼550/740 J g -1 for in situ MMC studies and ∼312/594 J g -1 for ex situ DSC analyses (charge state at 4 V and discharge state at 2 V) show that the discharged state of sodiated
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- Author
- Manikandan Palanisamy; Venkata Rami Reddy Boddu; Parasharam M. Shirage; Vilas G. Pol
- Publisher
- American Chemical Society (ACS)
- Published
- 2021
- Language
- EN
- Field
- Engineering (Physical Sciences)