Rational Design of N-Doped CuS@C Nanowires toward High-Performance Half/Full Sodium-Ion Batteries

Abstract

Transition-metal sulfides (TMSs) are considered excellent anode materials for sodium-ion batteries by virtue of decent capabilities based on multielectron conversion reactions. Herein, N-doped carboncoated CuS nanowires (CuS NWs@NC) were facilely fabricated via a refluxing method, following in situ dopamine polymerization and sulfidation process. Employed as anodes for SIBs, the CuS NWs@NC deliver a highly invertible capacity of 571.1 mA h g −1 after 100 cycles at 0.2 A g −1 and a competitive rate capability of 294.4 mA h g −1 even at 20 A g −1 . Remarkably, they exhibit a competitive long-life cyclic stability (216.7 mA h g −1 at 20 A g −1 , 81.7% capacity retention over 10,000 cycles). Furthermore, the galvanostatic intermittent titration technique test reveals that the unique nanoarchitecture boosts the Na + diffusion ability, guaranteeing superb cyclability and exceptional rate performance. Finally, a NVP/C||CuS NW@ NC full battery was facilely constructed, which demonstrates a steady capacity of 220 mA h g −1 at 0.2 A g −1 over 200 cycles. The superior sodium storage performance is likely due to the one-dimensional coaxial core−shell nanoarchitecture and synergistic effect of the inner CuS nanowires with the outer conductive nitrogen-doped carbon layer, which provide a highway for fast electron/ion transport, restrain stress and agglomeration of CuS during cycling, and offer a significant capacitive-controlled capacity contribution. This scalable design provides a new strategy for improving the sodium storage property of other TMSs.

Ti3C2Tx MXene Conductive Layers Supported Bio‐Derived Fex−1Sex/MXene/Carbonaceous Nanoribbons for High‐Performance Half/Full Sodium‐Ion and Potassium‐Ion Batteries

“…Owing to the enhanced Na/K ion storage capabilities of the Fe x−1 Se x /MXene/FCR anodes for SIBs and PIBs as compared with the paramete rs of similar anodes displayed in Figure 6a, [20,[29][30][31][32][33][34][35] full-cell devices were assembled using Na 3 V 2 (PO 4 ) 3 (NVP) and K 3 V 2 (PO 4 ) 3 (KVP) counter electrodes to further evaluate the practical applicability of the synthesized hybrid nanoribbons (Figure 6b). [36,37] The morphologies and phase compositions of the NVP and KVP cathodes, investigated by the SEM and XRD techniques in Figures S21 and S22, Supporting Information, are similar to those reported in previous studies. Figure 6c shows the two couples of redox peaks obtained for the Na + insertion/extraction processes occurring in the corresponding half-cell CV curves (colored in blue and yellow), suggesting the full utilization of the cathodes and anodes of the Fe x−1 Se x /MXene/FCR//NVP SIBs in the voltage range of 0.4-3.9 V. Similarly, the operating potential applied to the Fe x−1 Se x /MXene/FCR//KVP counterpart was 3.5 V (Figure S23, Supporting Information).…”

An insight into the sodium-ion and lithium-ion storage properties of CuS/graphitic carbon nitride nanocomposite

“…The insertion of sodium ion in the composite anode was done to reduce the loss of sodium ions during the initial cycles which impacts the full cell performance. 55 The full cell was cycled at 0.1 A g −1 between the voltage range 0.2–3.0 V and the cycle performance and GDC plots are shown in Fig. 7a and b , respectively.…”

Rational Design of the CoS/Co9S8@NC Composite Enabling High-Rate Sodium-Ion Storage

“…Also, TMS will undergo a serious volume change during the sodiation/desodiation, resulting in pulverization of the electrode, and form an uncontrollable solid electrolyte interphase (SEI) layer, which will both lead to unsatisfactory cycling stability. Previous studies show that the performance of TMS electrodes can be enhanced by various methods. − For example, the capacity fading problem caused by volume change during cycling can be optimized with a careful design of nanostructure TMS. − At the same time, the nanostructured TMS can also show faster ion conduction and achieve good rate performance, as it could provide more ion transport channels and shortened pathways. − The poor electrical conductivity of TMS can be modified by introducing a carbon matrix. − In addition, pseudocapacitive behaviors during charge/discharge processes through defective carbon could lead to an effective influence on boosting the high rate energy storage system. , It should be noted here that constructing novel heterostructures of TMS can improve the electrochemical kinetics of sodiation/desodiation. − This interfacial engineering allows the Sb 2 S 3 -SnS 2 heterointerface to form a built-in electric field that induces a Na + pump into the interface and then serves as an ion reservoir during electrochemical processes . Despite so much research, the study on Na + diffusion and reaction kinetics of metal sulfides is still insufficient, especially for heterostructured materials.…”