Polymer ( IF 4.6 ) Pub Date : 2018-01-08 , DOI: 10.1016/j.polymer.2018.01.022 Haipeng Li , Yaqiong Wei , Jun Ren , Wulin Zhang , Chengwei Zhang , Yongguang Zhang
A novel three-dimensionally (3D) ordered hierarchically porous polypyrrole (3DOHPPy) is successfully synthesized via a simple chemical polymerization method by using silica colloidal crystals as templates. The 3DOHPPy possesses a large BET specific surface area (118.5 m2 g−1), 3D ordered interconnected macropores (240 nm) and mesopores (2–3 nm) on the macropore walls. The sulfur/3DOHPPy (S/3DOHPPy) composite is prepared by a solution-diffusion route followed by low-temperature heat treatment and studied as a cathode material for the lithium/sulfur (Li/S) battery. The resulting S/3DOHPPy cathode shows a high specific discharge capacity of 751 mAh g−1 even after 100 cycles at 0.1 C and great rate capability. The superior electrochemical property of the S/3DOHPPy composite is ascribed to the unique hierarchical structure of 3DOHPPy with ordered interconnected macropores that benefit enhanced mass transfer and the small mesopores on the macropore walls that can immobilize the sulfur and polysulfides produced during the discharge/charge processes.
中文翻译:
三维顺序分层多孔聚吡咯,将硫作为锂/硫电池的高性能阴极
以二氧化硅胶体晶体为模板,通过简单的化学聚合方法成功地合成了新颖的三维(3D)有序分层多孔聚吡咯(3DOHPPy)。3DOHPPy具有较大的BET比表面积(118.5 m 2 g -1),大孔壁上的3D有序互连大孔(240 nm)和中孔(2-3 nm)。硫/ 3DOHPPy(S / 3DOHPPy)复合材料是通过溶液扩散途径然后进行低温热处理制备的,并被研究用作锂/硫(Li / S)电池的正极材料。所得的S / 3DOHPPy阴极显示出751 mAh g -1的高比放电容量即使在0.1 C和高倍率能力下经过100次循环后也是如此。S / 3DOHPPy复合材料的优异电化学性能归因于3DOHPPy独特的分层结构,具有有序的相互连接的大孔,有利于增强传质,大孔壁上的小中孔可固定放电/充电过程中产生的硫和多硫化物。