Improving the electrochemical performance of layered lithium-rich cathode materials by fabricating a spinel outer layer with Ni3+
| Autor: | Quanfeng Dong, Jun Zang, Weixiang Ding, Ming Lei, Cheng Yang, Mingsen Zheng, Qian Zhang |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Spinel chemistry.chemical_element General Chemistry engineering.material Electrochemistry Cathode law.invention chemistry.chemical_compound chemistry Chemical engineering law engineering Surface modification General Materials Science Ammonium persulfate Lithium Layer (electronics) Faraday efficiency |
| Zdroj: | Journal of Materials Chemistry A. 3:7554-7559 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c5ta00009b |
| Popis: | Surface modification and fabrication of composite structures have been reported to be efficient strategies to obtain cathode materials with satisfactory electrochemical performance. Herein, a combined method to fabricate an oxidized spinel outer layer containing Ni3+ is demonstrated to be an effective method to improve the rate capability as well as cyclability of Li-rich cathode materials. Such a surface modification process is carried out through a facile treatment with ammonium persulfate, and a homogeneous layered-spinel structure is thus obtained, which contains intimately connected layered bulk and an oxidized spinel outer layer. The thus-obtained material delivers a charge/discharge capacity of 330.5/308.7 mA h g−1, with an enhanced coulombic efficiency up to 93.4% and a rather fascinating rate capability of 169.1 mA h g−1, 100.8 mA h g−1, and 68.2 mA h g−1 at 10 C, 20 C and 30 C, respectively, and a much superior cycle performance, which is a stable capacity with no fading after prolonged 200 cycles. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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