A New Polyoxometalate (POM)‐Based Composite: Fabrication through POM‐Assisted Polymerization of Dopamine and Properties as Anode Materials for High‐Performance Lithium‐Ion Batteries

Abstract

Organic substrates are indispensable in the fabrication of multifunctional polyoxometalate (POM)-based composites for various applications. A new molybdovanadophosphoric heteropolyacid (PMo V )-based polydopamine (PDA) composite (PMo V /PDA) is first synthesized through a facile, in situ polymerization method under hydrothermal conditions, without the addition of extra buffer solution. The obtained PMo V /PDA composite shows homogeneous microsphere morphology. Through utilization of the adhesive ability of PDA, the composite can be used as an anode material without additional binder for rechargeable lithium-ion batteries. Excellent electrochemical performances are obtained, with a high, stable specific capacity of 915.3 mA h g at a current density of 100 mA g , remarkable rate capability, and good cycling stability (≈93 % capacity retention after 300 cycles at a high current density of 1000 mA g ).

Boosting the Pseudocapacitive and High Mass‐Loaded Lithium/Sodium Storage through Bonding Polyoxometalate Nanoparticles on MXene Nanosheets

“…As shown in Figure 3g, the capacity retention at both current densities remains high even after 1000 cycles, which is superior to most of the previously reported POM‐based electrodes (Table S1, Supporting Information). [ 10,13,18,49–60 ] Specifically, the hybrid with rationally combined POMs and MXenes offers a decent specific capacity, the longest cyclic stability, and a profound rate performance among these hybrid structures. Figure 3h shows the evolution of the mass capacity and areal capacity with the loading mass of the active materials.…”

Self‐Assembly of Polyoxometalate‐Resorcin[4]arene‐Based Inorganic‐Organic Complexes: Metal Ion Effects on the Electrochemical Performance of Lithium Ion Batteries

“…For comparison, the electrochemical performances of the previous POM-materials were supplied in Figure 8 and Table S4. [6,7,19,52,63,68,[71][72][73] capacity of 600 mAh g À 1 under the same conditions. [72] O 40 ]/SWNT was applied as an anode material for LIBs, the discharge capacity could stabilize at 859 mAh g À 1 .…”

“…Polyoxometalates (POMs), an outstanding class of metal‐oxygen clusters, feature unrivalled structures and attractive properties [1–5] . In particular, the high‐valent metal ions (e. g., V, Mo, W) present in POMs always lead to their reversible multielectron redox behavior [6–15] . Consequently, POMs are considered as a kind of significant anode materials for lithium ion batteries (LIBs) [16–19] .…”

“…[1][2][3][4][5] In particular, the high-valent metal ions (e. g., V, Mo, W) present in POMs always lead to their reversible multielectron redox behavior. [6][7][8][9][10][11][12][13][14][15] Consequently, POMs are considered as a kind of significant anode materials for lithium ion batteries (LIBs). [16][17][18][19] Compared to commercial graphite (372 mAh g À 1 ), POMs are easier to meet the increasing demands of energy storage devices because of their high theoretical capacities.…”

Polyoxometalates: Tailoring metal oxides in molecular dimension toward energy applications

“…H 5 PMo 10 V 2 O 40 forms nanocomposites with graphene oxide, demonstrating superior lithium storing properties . Composites based on PMo 12 /polyaniline/multi‐wall carbon nanotubes are fabricated for restraining the charge storing species, and PMo 10 ‐based polyoxometalate is used to polymerize dopamine, resulting in homogenous composites and application in lithium‐ion battery with good stability without the aid of binder materials . The conjugation between Keggin‐type H 3 PMo 12 O 40 and the graphene oxide is improved by the pyrrole bridge, leading to efficient polyoxometalate anchoring for redox performance .…”