S／In2 O3纳米材料的制备及其在锂硫电池正极材料中的应用

摘要

以硝酸铟和蔗糖为原料，依次经水热反应和550℃碳化制得In2 O3纳米材料（ nano-In2 O3）；将硫渗入nano-In2 O3得S／In2 O3，其结构和微观形貌经SEM， TEM和XRD表征。将S／In2 O3，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 LiPF6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／In2 O3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 mA· g－1，首次放电比容量为1357 mAh· g－1，库伦效率为82．75％。经80次充放电后，放电比容量为537 mAh· g－1。%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.