Topochemistry‐Driven Synthesis of Transition‐Metal Selenides with Weakened Van Der Waals Force to Enable 3D‐Printed Na‐Ion Hybrid Capacitors

Abstract

Hybrid capacitors exhibit promise to bridge the gap between rechargeable high-energy density batteries and high-power density supercapacitors. This separation is due to sluggish ion/electron diffusion and inferior structural stability of battery-type materials. Here, a topochemistry-driven method for constructing expanded 2D rhenium selenide intercalated by nitrogen-doped carbon hybrid (E-ReSe 2 @INC) with a strong-coupled interface and weak van der Waals forces, is proposed. X-ray absorption spectroscopy analysis dynamically tracks the transformation from ReO into ReC bonds. The bridging bonds act as electron transport channels to enable improved conductivity and accelerated reaction kinetics. The expanded interlayer-spacing of ReSe 2 layer by INC facilitates ion diffusion and ensures structural stability. As expected, the E-ReSe 2 @INC achieves an improved rate capability (252.5 mAh g −1 at 20 A g −1 ) and long-term cyclability (89.6% over 3500 cycles). Moreover, theoretical simulations reveal the favorable Na + storage kinetics can be ascribed to its low bonding energy of −0.06 eV and diffusion barrier of 0.08 eV for sodium ions. Additionally, it is demonstrated that 3D printed sodium-ion hybrid capacitors deliver high energies/power densities of 81.4 Wh kg −1 /0.32 mWh cm −2 and 9992.1 W kg −1 /38.76 mW cm −2 , as well as applicability in a wide temperature range.

A Universal Polyiodide Regulation Using Quaternization Engineering toward High Value‐Added and Ultra‐Stable Zinc‐Iodine Batteries

“…The capacitive ( k 1 v ) and diffusion contributions ( k 2 v 1/2 ) in the GC‐PAN/I cathode were further quantified according to Equations ( 3 ) and ( 4 ). [ 40 , 41 ] …”

“…The capacitive ( k 1 v ) and diffusion contributions ( k 2 v 1/2 ) in the GC‐PAN/I cathode were further quantified according to Equations () and (). [ 40,41 ] $$\begin{equation}i = {k_{\rm{1}}}v + {k_2}{v^{1/2}}\end{equation}$$ $$\begin{equation}i/{v^{1/2}} = {k_1}{v^{1/2}} + {k_2}\end{equation}$$…”

Rationally Designed Sodium Chromium Vanadium Phosphate Cathodes with Multi‐Electron Reaction for Fast‐Charging Sodium‐Ion Batteries

“…One approach using intermittent energy generation (solar/wind) urgently requires a reliable and cost-effective electrochemical energy storage technology. [1,2] PO bonds), excellent air tolerance and higher redox potential (inductive effect between transition metal and phosphates). [18] Due to the ease of redox tunability, diverse NASI-CONs have been identified, including Na 3 V 2 (PO 4 ) 3 , [19] Na 2 CrTi(PO 4 ) 3 , [20] Na 2 TiV(PO 4 ) 3 , [21,22] Na 4 NiV(PO 4 ) 3 , [23] Na 3 Mn Ti(PO 4 ) 3 , [24,25] Na 3 FeV(PO 4 ) 3 , [23] Na 3 MnZr(PO 4 ) 3 , [26] Na 4 Mn V(PO 4 ) 3 , [23,27,28] Na 4 MnAl(PO 4 ) 3 , [29] Na 4 MnCr(PO 4 ) 3 , [30][31][32] and Na 4 VMn 0.5 Fe 0.5 (PO 4 ) 3 , [33] etc.…”

“…One approach using intermittent energy generation (solar/wind) urgently requires a reliable and cost‐effective electrochemical energy storage technology. [ 1,2 ] Lithium‐ion batteries (LIBs) have changed modern life—enabling mobile communication and electric vehicles. They are the most widespread energy storage devices but they are not totally suitable for sustainable development due to the limited lithium resources in countries often with underlying political disputes.…”

Harnessing the Defects at Hetero‐Interface of Transition Metal Compounds for Advanced Charge Storage: A Review

“…[27] Moreover, the weak interlayer van der Waals (vdW) force in the layered structure of TMDs is beneficial to hosting the alkali metal ions. [28][29][30] Nevertheless, the unavoidable oxidation, agglomeration, and conversion reaction involving unstable electrochemistry greatly hinder the application of TMD anode materials. [22] Accordingly, researchers have explored various strategies to accelerate the reaction kinetics of TMC electrode materials from the surface to the bulk phase and prolong the cycling stability; such strategies include nanostructural design, [7,31] compositing with conductive supports, [11,32,33] and surface modification.…”