以蛋白石页岩为载硫体,通过化学沉积法制备蛋白石页岩/硫复合材料,再利用化学氧化聚合法在其表面包覆一层聚苯胺,制备出一种新型的蛋白石页岩/硫–聚苯胺复合材料,作为锂硫电池的正极材料。SEM、TEM和BET等测试结果表明蛋白石页岩呈层...以蛋白石页岩为载硫体,通过化学沉积法制备蛋白石页岩/硫复合材料,再利用化学氧化聚合法在其表面包覆一层聚苯胺,制备出一种新型的蛋白石页岩/硫–聚苯胺复合材料,作为锂硫电池的正极材料。SEM、TEM和BET等测试结果表明蛋白石页岩呈层状多孔结构,小尺寸硫在材料内分布均匀,聚苯胺包覆的厚度约为400 nm。电化学性能测试表明,蛋白石页岩/硫–聚苯胺正极活化后放电比容量最高达到1164.93 m Ah/g,在0.5C(1.0C=1675 m A/g)倍率下,循环300次后放电比容量为539.30 m Ah/g,库伦效率始终保持在95%以上,说明蛋白石页岩具有良好的吸附性,同时导电聚苯胺包覆层具有双效固硫的作用,有利于吸附多硫化物和抑制穿梭效应。展开更多
We displayed that the low-cost natural zeolite with molecular sieve structure can be used as the carrier of sulfur in lithium-sulfur batteries.Meanwhile,a simple salt-washing method was implemented on zeolite for dred...We displayed that the low-cost natural zeolite with molecular sieve structure can be used as the carrier of sulfur in lithium-sulfur batteries.Meanwhile,a simple salt-washing method was implemented on zeolite for dredging the internal microchannel to improve the ability of adsorption,ion exchange and sulfur loading.The experimental results show that the first specific discharge capacities of zeolite/S and salt-washed zeolite/S cathode under 0.2 C current density are 950.7 and1116.8 mAh/g,respectively,and corresponding discharge capacities remain at 350.6 and 604.2 mAh/g after 300 cycles.The first specific discharge capacity of salt-washed zeolite/S composite is 17.5%higher than that sample without salt-washing,and the corresponding ionic conductivity is improved.展开更多
基金Project(2018RS3091) supported by the Hunan Innovation Team,ChinaProjects(52202308, 12105097) supported by the National Natural Science Foundation of ChinaProject(2021RC2092) supported by the Science and Technology Innovation Program of Hunan Province,China。
文摘以蛋白石页岩为载硫体,通过化学沉积法制备蛋白石页岩/硫复合材料,再利用化学氧化聚合法在其表面包覆一层聚苯胺,制备出一种新型的蛋白石页岩/硫–聚苯胺复合材料,作为锂硫电池的正极材料。SEM、TEM和BET等测试结果表明蛋白石页岩呈层状多孔结构,小尺寸硫在材料内分布均匀,聚苯胺包覆的厚度约为400 nm。电化学性能测试表明,蛋白石页岩/硫–聚苯胺正极活化后放电比容量最高达到1164.93 m Ah/g,在0.5C(1.0C=1675 m A/g)倍率下,循环300次后放电比容量为539.30 m Ah/g,库伦效率始终保持在95%以上,说明蛋白石页岩具有良好的吸附性,同时导电聚苯胺包覆层具有双效固硫的作用,有利于吸附多硫化物和抑制穿梭效应。
基金Funded by the National Natural Science Foundation of China(Nos.11627801,51772254,11502225,and 51375017)the Natural Science Foundation of Hunan Province of China(No.2019JJ50578)。
文摘We displayed that the low-cost natural zeolite with molecular sieve structure can be used as the carrier of sulfur in lithium-sulfur batteries.Meanwhile,a simple salt-washing method was implemented on zeolite for dredging the internal microchannel to improve the ability of adsorption,ion exchange and sulfur loading.The experimental results show that the first specific discharge capacities of zeolite/S and salt-washed zeolite/S cathode under 0.2 C current density are 950.7 and1116.8 mAh/g,respectively,and corresponding discharge capacities remain at 350.6 and 604.2 mAh/g after 300 cycles.The first specific discharge capacity of salt-washed zeolite/S composite is 17.5%higher than that sample without salt-washing,and the corresponding ionic conductivity is improved.
