Na2FeP2O7: A Safe Cathode for Rechargeable Sodium-ion Batteries | Zendy

Prabeer Barpanda | Zendy; Guandong Liu | Zendy; Chris D. Ling | Zendy; Mao Tamaru | Zendy; Maxim Avdeev | Zendy; SaiCheong Chung | Zendy; Yuki Yamada | Zendy; Atsuo Yamada | Zendy

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Na₂FeP₂O₇: A Safe Cathode for Rechargeable Sodium-ion Batteries

Author(s) -

Prabeer Barpanda,

Guandong Liu,

Chris D. Ling,

Mao Tamaru,

Maxim Avdeev,

SaiCheong Chung,

Yuki Yamada,

Atsuo Yamada

Publication year - 2013

Publication title -

chemistry of materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.741

H-Index - 375

eISSN - 1520-5002

pISSN - 0897-4756

DOI - 10.1021/cm401657c

Subject(s) - cathode , monoclinic crystal system , pyrophosphate , electrochemistry , thermal stability , triclinic crystal system , battery (electricity) , ion , anode , materials science , sodium ion battery , thermal decomposition , sodium , inorganic chemistry , chemistry , crystal structure , crystallography , electrode , metallurgy , faraday efficiency , thermodynamics , physics , organic chemistry , power (physics) , enzyme

Vying for newer sodium-ion chemistry for rechargeable batteries, Na2FeP2O7 pyrophosphate has been recently unveiled as a 3 V high-rate cathode. In addition to its low cost and promising electrochemical performance, here we demonstrate Na2FeP2O7 as a safe cathode with high thermal stability. Chemical/electrochemical desodiation of this insertion compound has led to the discovery of a new polymorph of NaFeP2O7. High-temperature analyses of the desodiated state NaFeP2O7 show an irreversible phase transition from triclinic (P (1) over bar) to the ground state monoclinic (P2(1)/c) polymorph above 560 degrees C. It demonstrates high thermal stability, with no thermal decomposition and/or oxygen evolution until 600 degrees C, the upper limit of the present investigation. This high operational stability is rooted in the stable pyrophosphate (P2O7)(4-) anion, which offers better safety than other phosphate-based cathodes. It establishes Na2FeP2O7 as a safe cathode candidate for large-scale economic sodium-ion battery applications. © 2013, American Chemical Society

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