The cyclic performance of cobalt-contained tungstates in lithium-ion batteries
Considering the potential application of polyoxometalates(POMs)as anode materials in the field of lithium-ion batteries,we selected a novel trivalent cobalt POM Ba3[BW11O39CoⅢ(H2O)],a stable inorganic metal heteropolyacid,according to the literatures.Its performance as an anode material in lithium-ion batteries was comprehensively tested and compared with that of a divalent cobalt polyoxotungstate Ba3.5[BW11O39CoⅡ(H2O)].The results show that even after 200 cycles at a current density of 200 mA·g-1,the trivalent cobalt material can still maintain a specific capacity of 269.2 mAh·g-1 with a Coulombic efficiency of 99.29%.Furthermore,the rate tests at the current density range from 0.2 to 5.0 A·g-1 show that the trivalent cobalt material still exhibits better performance than divalent one.After the current density recovers to 0.2 A·g-1,the specific capacity quickly recovers to 454 mAh·g-1,demonstrating that the trivalent cobalt material has better stability and rate performance.These findings provide valuable references for the future application of cobalt-contained tungstates in the field of lithium-ion batteries.
polyoxometalate(POM)lithium-ion batteriesanode materialsnovel energy materials
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维普
