Abstract
The development of transition metal phosphides as potential anode materials of sodium-ion batteries has been substantially hindered by their sluggish kinetics and significant volume change during the sodiation/desodiation process. In this work, we put forward a rational design strategy to construct a hollow-structured CoP@C composite to achieve ultrafast and durable sodium energy storage. The CoP@C composite with a well-defined hollow dodecahedron architecture has been synthesized via a stepwise treatment of carbonization and pohsphorization on ZIF-67. The unique hollow carbon framework not only provides high-speed electron/ion transportation pathways for CoP to enable fast sodiation kinetics, but also accommodates large volume change to stabilize the electrode structure. As a consequence, the CoP@C composite could exhibit an ultra-high rate capability of 105 mAh·g−1 at a current density of 30 A·g−1, and a long-term cycling lifetime. The present study will pave a fresh strategy for exploring advanced high-power anode materials for sodium ion batteries. Graphical abstract: [Figure not available: see fulltext.]
Original language | English |
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Pages (from-to) | 1859-1869 |
Number of pages | 11 |
Journal | Rare Metals |
Volume | 41 |
Issue number | 6 |
DOIs | |
State | Published - Jun 2022 |
Keywords
- Anode
- High-rate capability
- Hollow structure
- Sodium ion battery
- Transition metal phosphide