三维分级多孔炭微球的制备及在锂空气电池中的应用

发布时间：2018-05-08 12:11

本文选题：脲醛树脂 + 炭微球　；参考：《新型炭材料》2017年06期

【摘要】：以尿素与甲醛为原料,在酸性条件下沉淀聚合制备脲醛树脂微球。随后进行预氧化、高温热处理制备炭微球。探究了脲醛比、固化剂浓度对炭微球形貌、结构和比表面积的影响。采用扫描电镜、透射电镜、N_2吸附等手段对所得产品的形貌与孔结构进行了表征。结果表明:当脲醛比为1∶0.8,固化剂浓度为0.5 M时,制备得到粒径分布均一、分散性好、球形度高的炭微球。其比表面积为498 m~2·g~(-1)。通过活化处理,比表面积提高为827 m~2·g~(-1)。用于锂空气电池的正极材料,在电流密度为100 mA·g~(-1)时,首次充放电比容量达到2 017 mAh·g~(-1)和2 075 mAh·g~(-1)。
[Abstract]:Urea-formaldehyde resin microspheres were prepared by precipitation polymerization of urea and formaldehyde under acidic conditions. Carbon microspheres were prepared by preoxidation and high temperature heat treatment. The effects of the ratio of urea to formaldehyde and the concentration of curing agent on the morphology, structure and specific surface area of carbon microspheres were investigated. The morphology and pore structure of the product were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that when the ratio of urea-formaldehyde to formaldehyde is 1: 0.8 and the concentration of curing agent is 0.5 M, carbon microspheres with uniform particle size distribution, good dispersion and high sphericity are prepared. Its specific surface area is 498mg ~ 2 g ~ (-1) C ~ (-1). By activation treatment, the specific surface area was increased to 827 mg / g ~ (-1). When the current density is 100mA / g ~ (-1), the first charge / discharge capacity of the cathode material for lithium-air battery is 2 017 mAh / g ~ (-1) and 2 075 mAh / g ~ (-1) ~ (-1).
【作者单位】：海南大学南海海洋资源利用国家重点实验室海南省硅锆钛资源综合开发与利用重点实验室;
【基金】：国家自然科学基金(51162006,51362009) 海南省重点项目(ZDXM2015118) 国际科技合作专项(KJHZ2015-02)~~
【分类号】：TM911.41

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