Spatially Self-Confined Formation of Ultrafine NiCoO2 Nanoparticles@Ultralong Amorphous N-Doped Carbon Nanofibers as an Anode towards Efficient Capacitive Li+ Storage.
Spatially Self-Confined Formation of Ultrafine NiCoO2 Nanoparticles@Ultralong Amorphous N-Doped Carbon Nanofibers as an Anode towards Efficient Capacitive Li+ Storage.
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DOI：
10.1002/chem.201804823
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发表时间：
2018-12
期刊：
影响因子：
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通讯作者：
Zhengluo Wang;Zhiwei Zhao;Yanru Zhang;Xiaopeng Yang;Xuan Sun;Jinyang Zhang;L. Hou;C. Yuan
中科院分区：
文献类型：
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作者：
Zhengluo Wang;Zhiwei Zhao;Yanru Zhang;Xiaopeng Yang;Xuan Sun;Jinyang Zhang;L. Hou;C. Yuan
尽管取得了开创性的突破，但锂离子电池负极材料的开发仍然是一个巨大的挑战。通过简化策略合理设计电极结构/组件将为LIBS的发展提供无限可能性。本研究采用自下而上的电纺法制备了超细NiCoO2纳米颗粒原位分散在非晶态掺氮碳纳米纤维(NCO@ANCNF)表面的一维超长纳米杂化材料。通过结构/组分的协同作用，获得了低负载量(≈33.6wt%)的超长NCO@ANCNF，具有高可逆容量、高倍率容量和长循环寿命的高效锂离子存储性能。分析了循环过程中出现的反常可逆晶型转变。定量分析表明，NCO@ANCNF具有优异的储锂性能，其主要原因是赝卡能贡献。此外，混合阳极即使在没有导电碳的情况下也能提供具有竞争力的储锂性能，大大提高了其商业适用性。组装了NCO@ANCNFS//LiNi0.8Co0.15Al0.05O2全电池，并表现出优异的电化学性能。这一贡献为为先进的下一代LIBS制造高效混合阳极提供了一种可扩展的方法。
The exploration of anode materials with a high degree of electrochemical utilization for Li-ion batteries (LIBs) still remains a huge challenge despite pioneering breakthroughs. Rational engineering of electrode structures/components by facile strategies would offer infinite possibilities for the development of LIBs. In this study, one-dimensional ultralong nanohybrids of ultrafine NiCoO2 nanoparticles dispersed in situ in and/or on the surface of amorphous N-doped carbon nanofibers (NCO@ANCNFs) were fabricated by a bottom-up electrospinning protocol. By virtue of synergistic structural/component features, the obtained ultralong NCO@ANCNFs with low NCO loading (≈33.6 wt %) show highly efficient Li+ storage performance with high reversible capacity, high rate capability, and long cycle life. The unusual reversible crystalline transformation during cycling was analyzed. Quantitative analysis revealed that the pseudocapacitive contribution mainly accounts for the superior lithium storage of the NCO@ANCNFs. Besides, the ability of the hybrid anode to deliver competitive Li-storage properties even without conductive carbon greatly enhances its commercial applicability. An NCO@ANCNFs//LiNi0.8 Co0.15 Al0.05 O2 full battery was assembled and exhibited striking electrochemical properties. This contribution offers a scalable methodology to fabricate highly efficient hybrid anodes for advanced next-generation LIBs.