MoS₂ nanosheets with expanded interlayer spacing for ultra-stable aqueous Mg-ion hybrid supercapacitor

Abstract

Aqueous magnesium ion supercapacitors (MISs) have attracted attention due to their safety, low cost and environmental friendliness. However, the cycling stability of MISs is usually not ideal due to magnesium...

Exploring 2D Energy Storage Materials: Advances in Structure, Synthesis, Optimization Strategies, and Applications for Monovalent and Multivalent Metal‐Ion Hybrid Capacitors

“…More significantly, an excellent energy density of 192.8 Wh kg −1 at a power density of 1682.7 W kg −1 and an extraordinary cycling stability with a capacitance retention of 93.8% after 30 000 cycles at 5 A g −1 could be achieved by this device. [ 531 ]…”

“…Moreover, magnesium ions have a smaller ionic radius than lithium ions and a low redox potential of −2.37 V (vs SHE). [530,531] Owing to the features above, magnesium ion-based hybrid capacitors are expected to have excellent energy storage performance. In 2014, the first MIHC was developed with magnesium as the anode, AC as the cathode, and 0.25 m magnesium organohaloaluminate complex (Mg 2 Cl 3 + -Ph 2 AlCl 2− ) and 0.5 m LiCl in THF as the electrolyte.…”

“…More significantly, an excellent energy density of 192.8 Wh kg −1 at a power density of 1682.7 W kg −1 and an extraordinary cycling stability with a capacitance retention of 93.8% after 30 000 cycles at 5 A g −1 could be achieved by this device. [531] Based on the strategy of electrolyte design to increase energy density, Han et al assembled a novel bromide-ion additive aqueous solution MHS (B-MHS) with potassium-doped lowcrystalline akhtenskite MnO 2 (K-MnO 2 -5) cathode and AC anode by introducing redox additives Br 3− /Br − into 1 m MgSO 4 electrolyte. [534] The B-MHS operating within a voltage range of 0-2.6 V presented the highest specific capacity of 268.1 mAh g −1 at 2 A g −1 .…”

Cotton textile inspires MoS2@reduced graphene oxide anodes towards high-rate capability or long-cycle stability sodium/lithium-ion batteries

“…It is obvious that the cathodic and anodic peaks are enhanced slightly as the scan rates go up. The current i and scan rates v can be linked through eqn (4) and (5): 42,43 i = av b log i = log a + b log v …”

K+ intercalated MnO2 with ultra-long cycling life for high-performance aqueous magnesium-ion hybrid supercapacitors

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] Recently, hybrid supercapacitors (HSCs) with batterytype Faraday and capacitive electrodes combine the advantages of metal-ion batteries and supercapacitors, which manifest good rate performance, high energy density, high power output, and long cycling life, representing a promising strategy to solve security challenges and improve energy density. [14][15][16][17][18][19][20][21][22][23] Among them, HSCs based on alkali metal ions (such as Li + , Na + , and K + ) have strong reactivity and are ammable when introduced into organic electrolytes, which is easy to bring signicant security risks. 24,25 In addition, the shortage of lithium resources and its uneven distribution on the earth also increase the cost of lithium-ion HSCs.…”