Electrochemical lithium and sodium insertion studies in 3D metal oxy-phosphate framework MoWO3(PO4)2 for battery applications

• Published in: Journal of solid state electrochemistry Vol. 25; no. 10-11; pp. 2675 - 2685
• Main Authors: Satyanarayana, M., Umeshbabu, Ediga, Jibin, A. K., James, Joseph, Justin, P., Varadaraju, U. V.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.10.2021; Springer Nature B.V
• Subjects: Amorphization; Analytical Chemistry; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Discharge; Electric potential; Electrochemistry; Electrode materials; Energy Storage; Insertion; Lithium ions; Original Paper; Physical Chemistry; Sodium; Structural integrity; Voltage; X-ray diffraction; ); Electrochemical properties; Li and Na insertion; MoWO; PO
• ISSN: 1432-8488; 1433-0768
• DOI: 10.1007/s10008-021-05051-4

A new type of three-dimensional (3D) oxy-phosphate materials are explored for the application of Li and Na batteries. The molybdenum tungsten oxy phosphate, MoWO 3 (PO 4 ) 2 , was synthesized by solid-state method and evaluated for Li/Na insertion/de-insertion electrode material for the first time. The cell at charged state (vs. Li + /Li) showed a discharge capacity of 786 mAh g −1 within the voltage window of 0.3 V with amorphization of crystalline MoWO 3 (PO 4 ) 2 as observed from ex-situ powder XRD analysis. The structural integrity was revealed in this material, even with nearly more than 5 Li + ions into the lattice, leading to the discharge capacity of 250 mAh g −1 . The reversible charge/discharge behavior with insertion/de-insertion of 2.4 Li + ions in the voltage range of 1.65 − 3.5 V resulted in 110 and 95 mAh g −1 at C/10 and C/5 rates, respectively. On the other hand, poor cycling performance was noticed for Na ion insertion and desertion, with a discharge capacity of 250 mAh/g within the voltage range of 0.3 − 3.5 V (vs. Na + /Na).