Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202003429
Keywords
anodes; hollow red P; magnetic‐ field assisted synthesis; porous carbon frameworks; potassium‐ ion batteries
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Funding
- National Natural Science Foundation of China [51772127, 51772131, 21805152, 52072151]
- Taishan Scholars [ts201712050]
- Major Program of Shandong Province Natural Science Foundation [ZR2018ZB0317]
- Postdoctoral Science Foundation of China [2018M640616, 201902038]
- Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong
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This study presents a hybrid architecture of hollow red P nanospheres confined in hierarchical N-doped carbon nanosheets/nanotubes framework, which is fabricated via a magnetic field assisted methodology. The resulting hybrid anode demonstrates exceptional structural/compositional merits and superb electrochemical performance in potassium storage.
Red P has drawn extensive attention as a promising low-cost anode for potassium-ion batteries (PIBs) thanks to its large theoretical capacity and natural abundance. However, serious pulverization/aggregation issues during consecutive cycles and sluggish kinetics limit its practical commercial applications. Herein, hollow red P nanospheres confined in hierarchical N-doped carbon nanosheets/nanotubes framework are designed and controllably fabricated via a simple yet efficient magnetic field assisted methodology. The involved magnetic field induced formation mechanism of the 3D hybrid architecture is tentatively put forward here. Comprehensive physicochemical/structural characteristics and theoretical simulation authenticate that the resultant hybrid anode is endowed with exceptional structural/compositional merits, which ameliorate volumetric expansion/compression over potassiation/depotassiation processes, and guarantee abundant active sites, rigid structure stability, and convenient electronic/ionic transport network for efficient potassium storage. As a result, the unique hollow red P based hybrid electrode delivers superb electrochemical performance in both half and full cells in terms of reversible capacities, rate properties, and long-duration cycling behaviors as a competitive anode toward advanced PIBs. More significantly, this work proposes an innovative strategy for efficient fabrication of hollow red P architectures for next-generation PIBs and beyond.
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