Three-Dimensional Self-assembled Hairball-Like VS4 as High-Capacity Anodes for Sodium-Ion Batteries

Abstract

HIGHLIGHTS • The unique hairball-like VS 4 composed of spiral nanowires was successively constructed through a one-step hydrothermal method. • The prepared hairball-like VS 4 exhibits high capacity and long cycle stability for Na + storage at room temperature, and it can tolerate drastic temperature changes. • The ex situ characterization and electrochemical kinetic analysis reveal that the storage mechanisms of VS 4 changed with the increase in the number of cycles. ABSTRACT Sodium-ion batteries (SIBs) are considered to be attractive candidates for large-scale energy storage systems because of their rich earth abundance and consistent performance. However, there are still challenges in developing desirable anode materials that can accommodate rapid and stable insertion/extraction of Na + and can exhibit excellent electrochemical performance. Herein, the self-assembled hairball-like VS 4 as anodes of SIBs exhibits high discharge capacity (660 and 589 mAh g −1 at 1 and 3 A g −1 , respectively) and excellent rate property (about 100% retention at 10 and 20 A g −1 after 1000 cycles) at room temperature. Moreover, the VS 4 can also exhibit 591 mAh g −1 at 1 A g −1 after 600 cycles at 0 °C. An unlike traditional mechanism of VS 4 for Na + storage was proposed according to the dates of ex situ characterization, cyclic voltammetry, and electrochemical kinetic analysis. The capacities of the final stabilization stage are provided by the reactions of reversible transformation between Na 2 S and S, which were considered the reaction mechanisms of Na-S batteries. This work can provide a basis for the synthesis and application of sulfur-rich compounds in fields of batteries, semiconductor devices, and catalysts.

Sodium ion intercalation and multi redox behavior of a Keggin type polyoxometalate during [PMo10V2O40]5−to [PMo10V2O40]27−as a cathode material for Na-ion rechargeable batteries

“…A b value of 0.5 corresponds to the diffusion controlled process, and a b value of 1.0 corresponds to the capacitive process. 46 For our system from the plot of log scan rate vs. log peak current, a slope is obtained in Fig. 6b which corresponds to b ¼ 0.5, implying the diffusive behavior of the Na-POM.…”

Designing g‐C3N4/N‐Rich Carbon Fiber Composites for High‐Performance Potassium‐Ion Hybrid Capacitors

“…As a reversible energy storage device, the lithium/sodium/potassium battery (LIBs/SIBs/ PIBs) can realize efficient and rapid energy storage through the mutual conversion between chemical energy and electric energy. [1][2][3][4][5]-Although LIBs occupied mobile power because of its good energy density, [6] they lack a good power density and reliable long cyclic stability to meet many important applications, [7] particularly at low temperatures. [8] On the contrary, hybrid supercapacitors (HSCs) can obtain high energy and power density and dramatically faster charging rate than LIBs, [9,10] because it consists of a battery electrode and a capacitive electrode.…”

层状钒酸钾应用于高性能高温钠离子电池

“…The wide application of LIBs has been severely limited due to the scarcity and uneven geographical distribution of lithium resources [11][12][13][14][15][16][17][18][19][20]. Because of the abundant sodium element reserves, low price, and similar physicochemical properties to LIBs, sodium-ion batteries (SIBs) have recently been considered as an important potential energy storage device [21][22][23][24][25][26][27][28]. Unfortunately, the relatively high atomic weight (23 g mol −1 , heavier than 6.9 g mol −1 of lithium) and large radius of Na + (1.02 Å, larger than 0.76 Å of lithium) lead to poor rate performance and severe volume expansion during the electrochemical sodiation/desodiation processes [29][30][31][32][33][34][35][36].…”