一步硬模板法制备层次孔炭及其在锂硫电池中的应用（英文）

发布时间：2018-07-03 16:44

  本文选题：微孔-中孔炭 + 大的孔容　； 参考：《新型炭材料》2017年04期

【摘要】：采用一步硬模板法炭化酚醛树脂和葡萄糖酸镁制备得到具有大表面积和层次化结构的微孔-中孔炭材料(HMMC)。在炭化过程中,葡萄糖酸镁分解形成纳米氧化镁(MgO)可以作为硬模板。制备得到的HMMC具有高的比表面积(1560m~2·g~(-1)),大的孔容(2.6cm~3·g~(-1)),可以实现较高硫的负载量,并可以提供硫体积膨胀的空间。此外,相互连通的孔结构和炭骨架也能够提供快速的电子和锂离子的传输通道。因此,与硫复合后得到的碳-硫杂化材料(HMMC-S)在0.3C电流密度下,初始放电容量高达939mAh·g~(-1),经150周循环后容量仍有731mAh·g~(-1),每周的容量损失率仅为0.15%。在较高的电流密度2C下,其容量仍可达626mAh·g~(-1),表现出优异的倍率性能和长循环稳定性。
[Abstract]:Microporous mesoporous carbon (HMMC) with large surface area and hierarchical structure was prepared by one step hard template carbonization phenolic resin and magnesium gluconate. In the process of carbonization, magnesium gluconate can be decomposed into nanometer magnesium oxide (MgO) as a hard template. The prepared HMMC has high specific surface area (1560m~2 g ~ (-1), large pore volume (2.6cm~3 g ~ (-1),) can achieve higher sulfur loading, and can provide space for sulfur volume expansion. In addition, the interconnected pore structure and carbon skeleton can also provide fast electron and lithium ion transport channels. Therefore, the initial discharge capacity of the carbon-sulfur hybrid material (HMMC-S) is as high as 939mAh g ~ (-1) at current density of 0.3C. After 150 weeks of cycle, the capacity of HMMC-S is still 731mAh g ~ (-1), and the loss rate of capacity is only 0.15% per week. At high current density 2C, its capacity can still reach 626mAh g ~ (-1), showing excellent rate performance and long cycle stability.
【作者单位】： 清华大学深圳研究生院炭功能材料工程实验室;清华大学材料学院先进材料教育部重点实验室;
【基金】：National Key Basic Research Program of China(2014CB932400) National Natural Science Foundation of China(U1401243) Shenzhen Basic Research Project(JCYJ20150529164918734,JCYJ20150331151358140,JCYJ20150331151358136)~~
【分类号】：TB33;TM912
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本文编号：2094289