期刊
ADVANCED ENERGY MATERIALS
卷 10, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201903139
关键词
3D hierarchical structure; cycling stable batteries; Li ion batteries; Li-rich cathodes; ultrahigh rate capability
类别
资金
- Shenzhen Fundamental Research and Discipline Layout project [JCYJ20170413102735544]
Li-rich oxide is a promising candidate for the cathodes of next-generation lithium-ion batteries. However, its utilization is restricted by cycling instability and inferior rate capability. To tackle these issues, three-dimensional (3D), hierarchical, cube-maze-like Li-rich cathodes assembled from two-dimensional (2D), thin nanosheets with exposed {010} active planes, are developed by a facile hydrothermal approach. Benefiting from their unique architecture, 3D cube-maze-like cathodes demonstrate a superior reversible capacity (285.3 mAh g(-1) at 0.1 C, 133.4 mAh g(-1) at 20.0 C) and a great cycle stability (capacity retention of 87.4% after 400 cycles at 2.0 C, 85.2% after 600 cycles and 75.0% after 1200 cycles at 20.0 C). When this material is matched with a graphite anode, the full cell achieves a remarkable discharge capacity (275.2 mAh g(-1) at 0.1 C) and stable cycling behavior (capacity retention of 88.7% after 100 cycles at 5.0 C, capacity retention of 84.8% after 100 cycles at 20.0 C). The present work proposes an accessible way to construct 3D hierarchical architecture assembled from 2D nanosheets with exposed high-energy active {010} planes and verifies its validity for advanced Li-rich cathodes.
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