Safe, Low-Cost, Fast-Kinetics and Low-Strain Inorganic-Open-Framework Anode for Potassium-Ion Batteries
| Autor: | Wenzhuo Deng, Yilong Pan, Jiajia Huang, Chuan-Fu Sun, Ruding Zhang, Shuping Huang, Jingze Bao |
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| Rok vydání: | 2019 |
| Předmět: |
Battery (electricity)
Materials science 010405 organic chemistry Potassium Intercalation (chemistry) Kinetics Analytical chemistry chemistry.chemical_element General Chemistry General Medicine 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences Anode chemistry Graphite Solid solution Voltage |
| Zdroj: | Angewandte Chemie (International ed. in English). 58(46) |
| ISSN: | 1521-3773 |
| Popis: | A key challenge for potassium-ion batteries is to explore low-cost electrode materials that allow fast and reversible insertion of large-ionic-size K+ . Here, we report an inorganic-open-framework anode (KTiOPO4 ), which achieves a reversible capacity of up to 102 mAh g-1 (307 mAh cm-3 ), flat voltage plateaus at a safe average potential of 0.82 V (vs. K/K+ ), a long lifespan of over 200 cycles, and K+ -transport kinetics ≈10 times faster than those of Na-superionic conductors. Combined experimental analysis and first-principles calculations reveal a charge storage mechanism involving biphasic and solid solution reactions and a cell volume change (9.5 %) even smaller than that for Li+ -insertion into graphite (≈10 %). KTiOPO4 exhibits quasi-3D lattice expansion on K+ intercalation, enabling the disintegration of small lattice strain and thus high structural stability. The inorganic open-frameworks may open a new avenue for exploring low-cost, stable and fast-kinetic battery chemistry. |
| Databáze: | OpenAIRE |
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