In-situ tracking of NaFePO4 formation in aqueous electrolytes and its electrochemical performances in Na-ion/polysulfide batteries - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Journal of Power Sources Année : 2019

In-situ tracking of NaFePO4 formation in aqueous electrolytes and its electrochemical performances in Na-ion/polysulfide batteries

Résumé

In-situ formation of pure olivine NaFePO4 from chemically synthesized LiFePO4 nanoparticles via an electrochemical ion-exchange route in sodium salt containing aqueous electrolyte is reported. Both in-situ electrochemical quartz crystal microbalance (EQCM) and in-situ X-ray diffraction (XRD) measurements are performed to monitor the formation of NaFePO4. Subsequently, a rechargeable Na-ion aqueous polysulfide battery is demonstrated where NaFePO4 and dissolved Na2S5 solution are used as cathode and anolyte, respectively; and are separated from each other by an ion-exchange polymeric membrane. In order to prevent diffusion of Na2S5 polysulfide from the anode to the cathode side, salt concentration at both sides of the NaFePO4||Na2S5 full cell is finely tuned resulting a 45 mAh g−1 cycling capacity over 200 cycles.

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Chimie
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Dates et versions

hal-02083629 , version 1 (29-03-2019)

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Serkan Sevinc, Burak Tekin, Ali Ata, Mathieu Morcrette, Hubert Perrot, et al.. In-situ tracking of NaFePO4 formation in aqueous electrolytes and its electrochemical performances in Na-ion/polysulfide batteries. Journal of Power Sources, 2019, 412, pp.55-62. ⟨10.1016/j.jpowsour.2018.11.035⟩. ⟨hal-02083629⟩
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