Effect of Annealing Treatment on the Electrochemical Properties of Polyoxomolybdate K₄[SiMo₁₂O₄₀] as Cathode Material of Lithium Battery

Abstract

Silicon-centered polyoxomolybdate K 4 [SiMo 12 O 40 ] (KSM) with the Keggin type structure was investigated as the cathode material for rechargeable lithium battery. The discharge capacity and cycle performance of KSM mainly depends on the annealing temperature. This material shows improved discharge capacity by the increase of annealing temperature. Rietveld analysis of X-ray powder diffraction data and Raman spectra were used to analyze the effect of annealing treatment on the cycle performance of KSM. The results indicate that the improvement of cycle performance would be caused by the re-oxidation of Mo 5+ ion in KSM reduced during the preparation process. The KSM cathode shows better electrochemical performance than that of the reported phosphorous-centered polyoxomolybdate K 3 [PMo 12 O 40 ] (KPM), indicating that KSM as the cathode material with high discharge capacity and cycle stability is accessible.

In situ X-ray absorption near edge structure studies and charge transfer kinetics of Na6[V10O28] electrodes

“…The stability of a POM electrode is independent from the recoverability of its crystal structure, because the polyanions are expected to undergo redox process as a molecular cluster rather than a continuum. [16][17][18][19] Many different POM materials have been studied for application in SCs. 19 which exhibit high capacity (up to 200 mAh g -1 ) and higher cycling stability than Mo-based POMs.…”

Improved Performance of Nano-Sized Polyoxometalate as Lithium-Battery Cathode by Conductive Polymer Coating

“…[5][6][7][8] Once the lithium is extracted over the recoverability limit of crystal structure, the cathode materials lose cycle stability and battery performance deteriorates drastically. 9 We propose that polyoxometalates (POMs), which are molecular cluster-ion materials, can be used as high-capacity cathode materials in lithium batteries [5][6][7][8][10][11][12][13] on the basis of the multi-electron redox reaction. POMs have individual molecular clusters and good cycle stability; this is because the capacity and cycle stability of molecular cluster-ion materials are independent from the stability of its crystal structure.…”

Investigation of polyoxometalates and nanostructured carbon materials as electrode materials for energy storage applications

“…3,75 POMs have been reported as promising cathode active materials for LIBs recently due to their ability to undergo fast redox reactions and transfer multiple electrons per molecule. 3,22,23,51,[75][76][77][78][79][80][81] They are expected to exhibit a lithium storage mechanism in between the ones described for lithium intercalation materials and organic radical materials. 75 electrode active materials for energy storage applications such as SCs, 7,[16][17][18][19][20][21] are reversible and independent from the recoverability of crystal structure.…”