S/In_2O_3纳米材料的制备及其在锂硫电池正极材料中的应用

以硝酸铟和蔗糖为原料,依次经水热反应和550℃碳化制得In_2O_3纳米材料(nano-In_2O_3);将硫渗入nanoIn_2O_3得S/In_2O_3,其结构和微观形貌经SEM,TEM和XRD表征。将S/In_2O_3,导电炭黑和聚偏氟乙烯按质量比8∶1∶1制成正极材料(1);将1涂覆于铝箔上,锂片作参比电极,1 mol·L~(-1)LiPF_6的DMF/DOL(V/V=1/1)溶液为电解液,组装成锂硫半电池。采用循环伏安法和恒电流充放电法研究了S/In_2O_3的电化学性能。结果表明:在1.95 V和2.3 V处有两个还原峰,2.5 V处有一个氧化峰。电流密度为335 m A·g~(-1),首次放电比容量为1 357m Ah·g~(-1),库伦效率为82.75%。经80次充放电后,放电比容量为537 m Ah·g~(-1)。

Preparation of S/In2 O3 Nanomaterial and Its Application in Cathode Material of Lithium Sulfur Batteries

In2 O3 nanomaterial( nano-In2 O3 ) was obtained by hydrothermal reaction and carbonation at 500 ℃, respectively, using indium nitrate and saccharose as the materials.S/In2 O3 was prepared by permeation of S into nano-In2 O3 .The structures and microtopograghies were characterized by SEM, TME and XRD.A cathode material(1) was prepared by mixing S/In2 O3 with carbon black and PVDF at mass ratio of 8∶1∶1.A lithium sulfur battery was assembled by 1(coating on aluminum foil), lithi-um plate and LiPF6 .The electrical performance of the S/In2 O3 cathode material was evaluated by CV and galvanostatic charge-discharge.The results showed that S/In2 O3 had two reduction peaks at 1.95 V, 2.3 V and a oxidation peak at 2.5 V.The current density, initial discharge capacity and coulom-bic efficiency of S/In2 O3 were 335 mA· g-1 , 1 357 mAh· g-1 and 82.75%, respectively.The dis-charge capacity of was 537 mAh· g -1 after cycling for 80 times.