本文選題：微孔-中孔炭 + 大的孔容　； 參考：《新型炭材料》2017年04期

【摘要】：采用一步硬模板法炭化酚醛樹(shù)脂和葡萄糖酸鎂制備得到具有大表面積和層次化結(jié)構(gòu)的微孔-中孔炭材料(HMMC)。在炭化過(guò)程中,葡萄糖酸鎂分解形成納米氧化鎂(MgO)可以作為硬模板。制備得到的HMMC具有高的比表面積(1560m~2·g~(-1)),大的孔容(2.6cm~3·g~(-1)),可以實(shí)現(xiàn)較高硫的負(fù)載量,并可以提供硫體積膨脹的空間。此外,相互連通的孔結(jié)構(gòu)和炭骨架也能夠提供快速的電子和鋰離子的傳輸通道。因此,與硫復(fù)合后得到的碳-硫雜化材料(HMMC-S)在0.3C電流密度下,初始放電容量高達(dá)939mAh·g~(-1),經(jīng)150周循環(huán)后容量仍有731mAh·g~(-1),每周的容量損失率僅為0.15%。在較高的電流密度2C下,其容量仍可達(dá)626mAh·g~(-1),表現(xiàn)出優(yōu)異的倍率性能和長(zhǎng)循環(huán)穩(wěn)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.
【作者單位】： 清華大學(xué)深圳研究生院炭功能材料工程實(shí)驗(yàn)室;清華大學(xué)材料學(xué)院先進(jìn)材料教育部重點(diǎn)實(shí)驗(yàn)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)~~
【分類(lèi)號(hào)】：TB33;TM912
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本文編號(hào)：2094289