title: Low-potential sodium insertion in a NASICON-type structure through the Ti(III)/Ti(II) redox couple.
abstract: We report the direct synthesis of powder Na3Ti2(PO4)3 together with its low-potential electrochemical performance and crystal structure elucidation for the reduced and oxidized phases. First-principles calculations at the density functional theory level have been performed to gain further insight into the electrochemistry of Ti(IV)/Ti(III) and Ti(III)/Ti(II) redox couples in these sodium superionic conductor (NASICON) compounds. Finally, we have validated the concept of full-titanium-based sodium ion cells through the assembly of symmetric cells involving Na3Ti2(PO4)3 as both positive and negative electrode materials operating at an average potential of 1.7 V.
authors: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), ALISTORE ERI European Research Institute, Campus de la Universitat Autònoma de Barcelona, E-08193 Bellaterra, Catalonia, Spain.
authors: P
authors: P
authors: Senguttuvan
authors: G
authors: G
authors: Rousse
authors: M E
authors: ME
authors: Arroyo y de Dompablo
authors: Hervé
authors: H
authors: Vezin
authors: J-M
authors: JM
authors: Tarascon
authors: M R
authors: MR
authors: Palacín
mesh_terms: D055664:Electrochemical Techniques; D004566:Electrodes; D015394:Molecular Structure; D010084:Oxidation-Reduction; D010710:Phosphates / Q000737:chemistry*; D011789:Quantum Theory; D012964:Sodium / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D010710:Phosphates; D012964:Sodium; D014025:Titanium