Nanoscale engineering of nitrogen-doped carbon nanofiber aerogels for enhanced lithium ion storage
Nanoscale engineering of nitrogen-doped carbon nanofiber aerogels for enhanced lithium ion storage
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DOI：
10.1039/c7ta02334k
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发表时间：
2017-05
影响因子：
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通讯作者：
Ye Guichao;Xiaoyi Zhu;Shuai Chen;Daohao Li;Yafang Yin;Yun Lu;S. Komarneni;Dongjiang Yang
中科院分区：
文献类型：
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作者：
Ye Guichao;Xiaoyi Zhu;Shuai Chen;Daohao Li;Yafang Yin;Yun Lu;S. Komarneni;Dongjiang Yang
我们开发了一种独特的工业规模可持续生物质转化策略，用于合成具有分层孔隙度的多功能三维（3D）碳纳米纤维（CNF）气凝胶。上述气凝胶也是通过热解竹纤维素进行高氮掺杂的。我们的合成策略的重要和关键部分是组装从竹子中提取的纤维素纳米纤维（NFC），以制造具有分级多孔结构的可控孔隙率的气凝胶。制备的CNF气凝胶具有丰富的化学反应位点和三维电子离子传递途径，是新型高性能锂离子电池负极材料。特别是，以直径为50 nm的一维纤维为基础材料制备的n掺杂CNF气凝胶在1 a g−1下具有630.7 mA h g−1的高可逆容量，在20 a g−1下具有289 mA h g−1的优异速率能力，在1000次循环后具有651 mA h g−1的优异循环性能。
We developed a unique industrial-scale sustainable biomass conversion strategy for the synthesis of multifunctional, three-dimensional (3D) carbon nanofiber (CNF) aerogels with hierarchical porosity. The above aerogels were also highly nitrogen-doped through pyrolysis of bamboo cellulose. The important and critical part of our synthesis strategy was to assemble the nanofibers of cellulose (NFC) from bamboo to make aerogels of controlled porosity with a hierarchical porous structure. The as-prepared CNF aerogels with abundant chemical reaction sites and three-dimensional electron and ion transport pathways were found to be new high-performance anode materials for lithium-ion batteries (LIBs). In particular, the N-doped CNF aerogel prepared with 1 D fibers of 50 nm in diameter as building-blocks exhibited a high reversible capacity of 630.7 mA h g−1 at 1 A g−1, excellent rate capability (289 mA h g−1 at 20 A g−1) and excellent cycling performance (651 mA h g−1 at 1 A g−1 after 1000 cycles) in LIBs.