Sodium titanate nanowires for Na⁺‐based hybrid energy storage with high power density

Abstract

It is crucial to enhance the rate capability of the titanium-based materials for fulfilling their promising potential as the anode materials of sodium-ion batteries (SIBs). Herein, Mn-doped sodium titanate (Mn-NTO) nanowires with homogeneously distributed ultrathin carbon nanosheets (Mn-NTO@C) are synthesized by a one-step salt-template-assisted method, showing much-enhanced power density. The as-prepared Mn-NTO@C demonstrates the realization of hybrid energy storage, which reconciles the diffusion-controlled behavior with the pseudocapacitive-controlled behavior. It has been revealed that the Mn heteroatoms can raise the proportion of Na 2 Ti 3 O 7 phase with the expanded crystal lattice, facilitating the diffusion-controlled insertion/extraction process of sodium ions. Meanwhile, the hybrid morphology of Mn-NTO nanowires and carbon nanosheets provides a promoted structure stability. As a result, the assembled Na||Mn-NTO@C half-cells work well at an extreme current density of 24 A g −1 for 10 000 cycles with a capacity retention of 95.2%. Moreover, the Mn-NTO@C||Na 3 V 2 (PO 4 ) 3 (NVP) full cells exhibit an attenuation of only 0.0015% per cycle at 20 A g −1 for over 10 000 cycles, and the energy density and power density of the full cells reach an ultrahigh level of 262 Wh kg −1 and 16.3 kW kg −1 , respectively.

Direct Ink Writing 3D Printing for High‐Performance Electrochemical Energy Storage Devices: A Minireview

“…The precise engineering of pore architecture in printed electrodes represents a well‐established approach for augmenting ion diffusion kinetics, thereby significantly boosting the power density of EESDs. [ 103 ] By leveraging the inherent macropores generated during 3D printing, advanced hierarchical pore structures can be achieved through in situ etching, [ 104,105 ] freeze drying, [ 106,107 ] or supercritical drying, [ 31 ] which can effectively impart superior ion transport properties to the printed electrodes. Zhang et al.…”

“…The precise engineering of pore architecture in printed electrodes represents a well-established approach for augmenting ion diffusion kinetics, thereby significantly boosting the power density of EESDs. [103] By leveraging the inherent macropores The Ragone plot of a printed 8-layer full cell. Reproduced with permission.…”

Significantly enhanced ion‐migration and sodium‐storage capability derived by strongly coupled dual interfacial engineering in heterogeneous bimetallic sulfides with densified carbon matrix

“…[4][5][6][7][8][9][10] The widespread commercial use of SIBs is however faced with the significant challenges, involving poor electrochemical activity, relatively great ion-diffusion barrier, and gravimetric energy density of anode materials, mainly thanks to larger ion-radius and heavier ionic-weigh of Na + in comparison to Li + . 11,12 Under these circumstances, frontier efforts toward exploiting SIBs anodes have primarily highlighted on the efficient use of double-type reaction-based anode matter (e.g., insertion-conversion or conversionalloy), enabling SIBs to match existing LIBs in energy densities. 13,14 As desirable double-type ion-storage anode, transition metal chalcogenides (TMCs), renowned for their more significant electronic conductivity, better redox reversibility, and smaller volumetric variations than their oxide counterparts, have been envisaged as the attractive matter for high-efficiency energy storage.…”

Vanadium fluorophosphates: advanced cathode materials for next-generation secondary batteries

“…[11][12][13][14][15][16][17][18][19][20][21][22] Nevertheless, their comprehensive performance cannot match that of LIBs at present mainly owing to the larger radius of Na + (B1.02 Å) and K + (B1.38 Å) than Li + (B0.76 Å), making it more difficult for Na + /K + to diffuse in/out of the electrodes. [23][24][25][26][27][28][29][30][31][32] Nowadays, the commercialization of SIBs/PIBs is hindered by their low energy density and inferior cycling stability. Firstly, the phenomenon of low energy density primarily originates from the high redox potential of Na/Na + (K/K + ) and their high atomic mass, and thus the SIB/PIB cathode materials will lose 15-20% of their theoretical energy density compared to LIBs.…”