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Microtubular carbon fibers derived from bamboo and wood as sustainable anodes for lithium and sodium ion batteries
Journal of Porous Materials ( IF 2.6 ) Pub Date : 2019-06-20 , DOI: 10.1007/s10934-019-00781-3
Xiang Zhang , Jingbo Hu , Xiaoyi Chen , Mei Zhang , Qinyuan Huang , Xiaoqing Du , Yuan Liu , Xianjun Li

Herein, a brief and scalable strategy to convert bamboo and woods into uniform hollow cellulose fibers with micrometer-size through a simple delignification process in nitric acid solutions is presented. Next, these cellulose fibers are further transformed into individual microtubular carbon fibers by a carbonization treatment. The evolved carbon fibers show an amorphous organization, large interlayer distances (0.39–0.40 nm) and narrow pore size distributions (0–10 nm), consequently exhibit superior electrochemical performance (vs. Li/Li+) in comparison with practical graphite anode. A high reversible capacity of 435 mA h g−1 at 50 mA g−1, as well as competitive rate capacity (up to 150 mA h g−1 at 2 A g−1) and stability over long-term cycling (76% capacity retention at 500 mA g−1 after 500 cycles) is achieved. Furthermore, a majority of reversible capacity was delivered by these carbon fibers at an obvious low discharging-charging potential plateau (0–0.1 V) as lithium ion battery anodes. When the carbon fibers derived from bamboo and paulownia are tested vs. Na/Na+, reversible capacities of 320 and 302 mA h g−1 at 50 mA g−1 are delivered, respectively.

中文翻译:

竹和木材制得的微管碳纤维可作为锂和钠离子电池的可持续阳极

在此,提出了一种简单且可扩展的策略,可通过在硝酸溶液中通过简单的脱木质素工艺将竹木和木材转变为微米级的均匀中空纤维素纤维。接下来,通过碳化处理将这些纤维素纤维进一步转变成单独的微管碳纤维。演化出的碳纤维显示出无定形组织,较大的层间距离(0.39–0.40 nm)和狭窄的孔径分布(0–10 nm),因此与实际的石墨阳极相比,具有优异的电化学性能(相对于Li / Li +)。的435毫安ħg的高可逆容量-1在50mA克-1,以及竞争性速率容量(高达150毫安ħ克-1以2A克-1)和长期循环的稳定性(500个循环后,在500 mA g -1下的容量保持76%)。此外,作为锂离子电池阳极,这些碳纤维在明显的低放电-充电电位平稳段(0-0.1 V)下提供了大部分可逆容量。当测试源自竹和泡桐的碳纤维相对于Na / Na +时,在50 mA g -1下分别提供了320和302 mA h g -1的可逆容量。
更新日期:2019-11-11
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