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Additive-Free Self-Presodiation Strategy for High-Performance Na-Ion Batteries |
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| Authors: | Feixiang Ding Qingshi Meng Pengfei Yu Haibo Wang Yaoshen Niu Yuqi Li Yang Yang Xiaohui Rong Xiaosong Liu Yaxiang Lu Liquan Chen Yong-Sheng Hu |
| Affiliation: | 1. Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190 China;2. Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190 China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049 China;3. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050 China;4. Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190 China Yangtze River Delta Physics Research Center Co. Ltd, Liyang, 213300 China;5. Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190 China Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049 China Yangtze River Delta Physics Research Center Co. Ltd, Liyang, 213300 China |
| Abstract: | The irreversible consumption of sodium at the anode side during the first cycle prominently reduces the energy density of Na-ion batteries. Different sacrificial cathode additives have been recently reported to address this problem; however, critical issues such as by-products (e.g., CO2) release during cycling and incompatibility with current battery fabrication procedures potentially deteriorate the full-cell performance and prevent the practical application. Herein, an additive-free self-presodiation strategy is proposed to create lattice-coherent but component-dependent O3-NaxTMMnO2 (TM = transition metal ion(s)) cathodes by a quenching treatment rather than the general natural cooling. The quenching material preserves higher Mn3+ and Na+ content, which is able to release Na+ via Mn3+ oxidation to compensate for sodium consumption during the initial charge while adopting other TM to provide the capacity in the following cycles. Full cells fabricated with hard carbon anode and this material as both cathode and sodium supplement reagent have a nearly 9.4% cathode mass reduction, around 9.9% energy density improvement (from 233 to 256 Wh kg?1), and 8% capacity retention enhancement (from 76% to 84%) after 300 cycles. This study presents the route to rational design cathode materials with sodium reservoir property to simplify the presodiation process as well as improve the full-cell performance. |
| Keywords: | full-cell performance irreversible sodium loss Na-ion batteries quenching method self-presodiation cathode materials |