Study on One-Dimensional Vanadium Nitride Nanowires in Lithium Sulfur Batteries
Lithium sulfur(Li-S)battery has attracted extensive attention for its advantages of high theoretical specific capacity,high energy density and abundant reserves,but its further development is restricted by the serious shuttle effect of lithium polysulfide(LPS)in the charging and discharging process.In order to effectively inhibit the shuttle effect and improve the performance of Li-S batteries,a one-dimensional vanadium nitride nanowire with good crystallization and uniform distribution of elements has been prepared by hydrothermal method.When the vanadium nitride nanowires were used as separator modification material,the infiltrative property between the electrolyte and the electrolyte can be improved,and the ion transport performance can be improved.Meanwhile,the formation of the modification layer can effectively cover the large holes of blank separator,thus effectively inhibiting the shuttle effect of LPS,and improving the ratio performance and cycle performance of the battery:The initial discharge capacity of 1055mAh·g-1 at 0.1C can be obtained,and the discharge capacity of 862mAh·g-1,803mAh·g-1,736mAh·g-1 and 651mAh·g-1 can be maintained at 0.5C,1C,2C and 5C,respectively.The cycle capacity of 641mAh·g-1 at 1C can be maintained,and when the positive sulfur loading reaches to 3mg·cm-2,the cycle capacity of 645mAh·g-1 can also be maintained at 3C.
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万方数据
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