Silicon @ nitrogen-doped porous carbon fiber composite anodes synthesized by an in-situ reaction collection strategy for high-performance lithium-ion batteries
Silicon @ nitrogen-doped porous carbon fiber composite anodes synthesized by an in-situ reaction collection strategy for high-performance lithium-ion batteries
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原位反应收集策略合成的硅@氮掺杂多孔碳纤维复合负极用于高性能锂离子电池
DOI：
10.1016/j.apsusc.2018.12.172
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发表时间：
2019-05
影响因子：
6.7
通讯作者：
Liu Tianxi
中科院分区：
文献类型：
--
作者：
Ouyang Yue;Zhu Xiaobo;Li Fei;Lai Feili;Wu Yue;Miao Yue E;Liu Tianxi
硅/碳纳米复合材料作为锂离子电池的新型电极材料，由于其具有高容量、良好的导电性、优异的延展性和较长的循环寿命等优点而引起了广泛的关注。在此，我们采用改进的静电纺丝策略，以吡咯原位反应浴作为特殊捕收剂，引入了一种新型的硅纳米颗粒包埋的氮掺杂多孔碳纤维框架（Si@NPCNF）。有趣的是，原位收集的聚吡啶（PPy）包覆的Si/PMMA前驱体纤维直径均匀，约为1.2 ~ 1.5 μm，具有三维（3D）互连的多孔结构。在850 ℃热处理后，得到的Si@NPCNF纳米复合材料具有高孔隙率和大表面积，可以有效缓解硅的严重体积膨胀，减少硅阳极在放电/充电过程中的粉化。此外，PPy形成的薄氮掺杂碳层可以大大提高Si阳极的电导率，缩短Li+的扩散距离。同时，三维多孔结构可以有效地防止Si与电解质直接接触，提高锂离子电池的循环稳定性。因此,Si@NPCNF纳米复合材料展览优秀的电化学性能,提供了一个高的初始容量1521马 h g−1 0.1 g−1,良好率能力648马 h g−1在2 515.5 g−1和良好的循环稳定性 马 h g−1 200次后1 g−1,承诺为高性能锂离子电池的阳极材料。
Silicon (Si)/carbon nanocomposites have attracted extensive interests as emerging electrode materials in lithium-ion batteries (LIBs) due to their numerous premium features of high capacity, good conductivity, excellent ductility and long cycle life. Herein, we introduce a novel nitrogen-doped porous carbon fiber framework entrapped with Si nanoparticles (Si@NPCNF) by an improved electrospinning strategy with an in-situ reaction bath of pyrrole as the special collector. It is interesting that the in-situ collected polypyrrole (PPy) coated Si/PMMA precursor fibers show uniform diameter around 1.2–1.5 μm with three-dimensional (3D) interconnected porous structures. After heat treatment at 850 °C, the resulted Si@NPCNF nanocomposite with high porosity and large surface area, can effectively relieve the severe volume expansion of silicon to reduce the pulverization of Si anode during the discharge/charge processes. Furthermore, the thin N-doped carbon layer derived from PPy can largely improve the conductivity of Si anode and shorten the Li+diffusion distance. Meanwhile, the 3D porous structure can efficiently prevent Si from directly contacting with electrolyte to improve the cycling stability of LIBs. Therefore, the Si@NPCNF nanocomposite exhibits outstanding electrochemical performance which delivers a high initial capacity of 1521 mA h g−1at 0.1 A g−1, a good rate capability of 648 mA h g−1at 2 A g−1and excellent cycle stability of 515.5 mA h g−1after 200 cycles at 1 A g−1, being promising as a high-performance anode material for lithium-ion batteries.
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影响因子：
8
作者：
Weiqun Li;Qian Wang;Ke Cao;Jingjing Tang;Hongtao Wang;Limin Zhou;H. Yao
通讯作者：
Weiqun Li;Qian Wang;Ke Cao;Jingjing Tang;Hongtao Wang;Limin Zhou;H. Yao
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影响因子：
17.1
作者：
Wu, Zhong-Shuai;Ren, Wencai;Cheng, Hui-Ming
通讯作者：
Cheng, Hui-Ming
影响因子：
16.6
作者：
Kim, Hyunjung;Han, Byunghee;Cho, Jaephil
通讯作者：
Cho, Jaephil
影响因子：
8.4
作者：
Inyeong Kang;Juyoung Jang;Moon-soo Kim;J. W. Park;J. Kim;Y. Cho
通讯作者：
Inyeong Kang;Juyoung Jang;Moon-soo Kim;J. W. Park;J. Kim;Y. Cho
影响因子：
20.4
作者：
Zheng-Long Xu;Ke Cao;Sara Abouali;Mohammad Akbari Garakani;Jiaqiang Huang;Jian‐Qiu Huang;E. Heidari;Hongtao Wang;J. Kim
通讯作者：
Zheng-Long Xu;Ke Cao;Sara Abouali;Mohammad Akbari Garakani;Jiaqiang Huang;Jian‐Qiu Huang;E. Heidari;Hongtao Wang;J. Kim