Effect of divalent transition metal ions on physical, morphological, electrical and electrochemical properties of alluaudite phases Na2M2+2Fe3+(PO4)3 (M = Mn, Co and Ni): Cathode materials for sodium-ions batteries

Harbaoui, Douha; Sanad, Moustafa M.S.; Rossignol, Cécile; Hlil, E.K.; Amdouni, Noureddine; Zaïdat, K.; Obbade, S.

doi:10.1016/j.jallcom.2022.163641

Cited by 10 publications

(3 citation statements)

References 57 publications

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“…Lithium-ion batteries are widely used in new-energy vehicles, communication equipment, and aerospace electronics owing to their fast-charging rate and long life [1]. However, with the accumulation of cycles, the performance of lithium-ion batteries inevitably deteriorates, leading to system failure and possibly even safety accidents [2,3]. Therefore, it is important to efficiently and accurately predict the Remaining Useful Life (RUL) of Li-ion batteries.…”

Section: Introductionmentioning

confidence: 99%

Lithium-Ion Battery Remaining Useful Life Prediction Based on Hybrid Model

Tang

Wan

Wang³

et al. 2023

Sustainability

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Accurate prediction of the remaining useful life (RUL) is a key function for ensuring the safety and stability of lithium-ion batteries. To solve the capacity regeneration and model adaptability under different working conditions, a hybrid RUL prediction model based on complete ensemble empirical mode decomposition with adaptive noise (CEEMDAN) and a bi-directional gated recurrent unit (BiGRU) is proposed. CEEMDAN is used to divide the capacity into intrinsic mode functions (IMFs) to reduce the impact of capacity regeneration. In addition, an improved grey wolf optimizer (IGOW) is proposed to maintain the reliability of the BiGRU network. The diversity of the initial population in the GWO algorithm was improved using chaotic tent mapping. An improved control factor and dynamic population weight are adopted to accelerate the convergence speed of the algorithm. Finally, capacity and RUL prediction experiments are conducted to verify the battery prediction performance under different training data and working conditions. The results indicate that the proposed method can achieve an MAE of less than 4% with only 30% of the training set, which is verified using the CALCE and NASA battery data.

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Section: Introductionmentioning

confidence: 99%

Lithium-Ion Battery Remaining Useful Life Prediction Based on Hybrid Model

Tang

Wan

Wang³

et al. 2023

Sustainability

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“…Barring just a few compositions, 38,41,42 only Fe 2+ /Fe 3+ redox has been harnessed, even in compounds containing multiple M species. 35,36,[43][44][45][46][47][48] For instance, Na2Fe3-xMnx(PO4)3 alluaudites can reach up to 140 mAh/g of reversible capacity for the x = 0 end-member and a steady decrease in capacity is observed as x increases. 36,37,49,50 These cathodes operate at 2.7 V vs. Na/Na + and no capacity can be attributed to the higher potential Mn 2+ /Mn 3+ couple, leading to rather low energy densities.…”

Section: Introductionmentioning

confidence: 99%

“…The development of Na-ion alluaudite cathodes has been hindered by the limited number of electrochemically active M species in this structure type. Barring just a few compositions, ,, only Fe 2+ /Fe 3+ redox has been harnessed, even in compounds containing multiple M species. ,,− For instance, Na 2 Fe 3– x Mn x (PO 4 ) 3 alluaudites can reach up to 140 mAh/g of reversible capacity for the x = 0 end-member, and a steady decrease in capacity is observed as x increases. ,,, These cathodes operate at 2.7 V vs Na/Na + , and no capacity can be attributed to the higher potential Mn 2+ /Mn 3+ couple, leading to rather low energy densities. In contrast, sulfate alluaudites exhibit unprecedently high operating voltages, so much so that the potentials of Ni- and Co-based systems fall outside of the electrochemical stability window of typical electrolytes. , The combination of a highly unstable structure on Na extraction (due to strong repulsion between edge-sharing MO 6 octahedra in the oxidized state) and a less negative “–2” charge on the sulfate group compared to the phosphate group results in low capacities for sulfate alluaudites. ,, Overall, a better understanding of the origin of the electrochemical inertness of Mn, with a redox potential well below the decomposition potential of organic electrolytes even in a sulfate alluaudite, is warranted, and the design of “beyond Fe” alluaudite cathodes is desirable.…”

Section: Introductionmentioning

confidence: 99%

Unlocking New Redox Activity in Alluaudite Cathodes through Compositional Design

Giovine

Foley

et al. 2022

Chem. Mater.

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Sodium (Na)-ion conducting polyanionic structures are among the most promising cathode materials to enable more sustainable Na-based battery chemistries to replace current Li-based energy storage systems. Materials adopting the alluaudite structure have been found to reversibly intercalate Na, with phosphate and sulfate derivatives exhibiting moderate to high capacities when used as Na-ion cathodes. However, the development of alluaudite cathodes has been hampered by the fact that largely only Fe 2+/3+ redox has been observed in this structure. Herein, we show that the Mn 2+/3+ redox couple can be activated through compositional tuning of alluaudite compounds. Specifically, vanadate compounds were explored to increase the electrical conductivity as compared to the phosphates and sulfates. Al substitution was also employed to buffer the Jahn-Teller distortions of Mn(III)O6 octahedra, further facilitating electron transfer and redox processes. We report the synthesis of a series of new Na2Mn3-xAlx(VO4)3 alluaudite cathodes and employ synchrotron X-ray diffraction, solid-state nuclear magnetic resonance, scanning electron microscopy, density functional theory, X-ray absorption spectroscopy, and magnetometry to characterize the structure, morphology, electronic and magnetic properties of the as-synthesized materials. Electrochemical Na de(intercalation) in Na2Mn3-xAlx(VO4)3 (x = 0, 0.05, 0.2) was probed through galvanostatic cycling, galvanostatic intermittent titration technique, and ex situ synchrotron X-ray diffraction. While these materials are all redox active, Al substitution results in a more than two-fold increase in discharge capacity. The successful activation of a higher voltage Mn 2+/3+ redox couple opens up a new compositional space for alluaudite-type Na-ion cathodes.

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