Ultrahigh power and energy density in partially ordered lithium-ion cathode materials
| Autor: | Deok-Hwang Kwon, Bryan D. McCloskey, Huiwen Ji, Alexander Urban, Jinpeng Wu, Raphaële J. Clément, Jue Liu, Wanli Yang, Emily E. Foley, Mahalingam Balasubramanian, Zijian Cai, Yaosen Tian, Haegyeom Kim, Gerbrand Ceder, Hyun-Chul Kim, Joseph K. Papp |
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| Rok vydání: | 2020 |
| Předmět: |
Work (thermodynamics)
Phase transition Materials science Chemical substance Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Manganese 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Energy storage Cathode 0104 chemical sciences Electronic Optical and Magnetic Materials Ion law.invention Fuel Technology chemistry law Chemical physics Lithium 0210 nano-technology |
| Zdroj: | Nature Energy. 5:213-221 |
| ISSN: | 2058-7546 |
| Popis: | The rapid market growth of rechargeable batteries requires electrode materials that combine high power and energy and are made from earth-abundant elements. Here we show that combining a partial spinel-like cation order and substantial lithium excess enables both dense and fast energy storage. Cation overstoichiometry and the resulting partial order is used to eliminate the phase transitions typical of ordered spinels and enable a larger practical capacity, while lithium excess is synergistically used with fluorine substitution to create a high lithium mobility. With this strategy, we achieved specific energies greater than 1,100 Wh kg–1 and discharge rates up to 20 A g–1. Remarkably, the cathode materials thus obtained from inexpensive manganese present a rare case wherein an excellent rate capability coexists with a reversible oxygen redox activity. Our work shows the potential for designing cathode materials in the vast space between fully ordered and disordered compounds. There is an intensive search for high-performance cathode materials for rechargeable batteries. Here the authors report that oxyfluorides with partial spinel-like cation order, made from earth-abundant elements, display both exceptionally high energy and power. |
| Databáze: | OpenAIRE |
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