Multidimensional Integrated Chalcogenides Nanoarchitecture Achieves Highly Stable and Ultrafast Potassium ‐Ion Storage

The first example of preparing 3D hierarchical nanoboxes multidimensionally assembled from interlayer ‐expanded nano‐2D MoS2@dot ‐like Co9S8 embedded into a nitrogen and sulfur codoped porous carbon matrix (Co9S8/NSC@MoS2@NSC) for greatly boosting the electrochemical properties of potassium ‐ion batteries in terms of reversible capacity, rate capability, and cycling stability, is reported. AbstractPotassium ‐ion batteries (KIBs) have come into the spotlight in large‐scale energy storage systems because of cost‐effective and abundant potassium resources. However, the poor rate performance and problematic cycle life of existing electrode materials are the main bottlenecks to future potential applic ations. Here, the first example of preparing 3D hierarchical nanoboxes multidimensionally assembled from interlayer‐expanded nano‐2D MoS2@dot ‐like Co9S8 embedded into a nitrogen and sulfur codoped porous carbon matrix (Co9S8/NSC@MoS2@NSC) for greatly boosting the electrochemical properties of KIBs in terms of reversible capacity, rate capability, and cycling lifespan, is reported. Benefiting from the synergistic effects, Co9S8/NSC@MoS2@NSC manifest a very high reversible capacity of 403 mAh g−1 at 100 mA g−1 after 100 cycles, an unprecedented rate capability of 141 mAh g−1 at 3000 mA g−1 over 800 cycles, and a negligible capacity decay of 0.02% cycle−1, boosting promising applications in high ‐performance KIBs. Density functional theory calculations d...

Source: Small - September 11, 2019 Category: Nanotechnology Authors: Chao Yang, Jianrui Feng, Yelong Zhang, Qifeng Yang, Peihao Li, Tobias Arlt, Feili Lai, Junjie Wang, Chaochuang Yin, Wei Wang, Guoyu Qian, Lifeng Cui, Wenjuan Yang, Yanan Chen, Ingo Manke Tags: Communication Source Type: research