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A Layered P2‐ and O3‐Type Composite as a High‐Energy Cathode for Rechargeable Sodium‐Ion Batteries |
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| Authors: | Shaohua Guo Pan Liu Dr. Haijun Yu Dr. Yanbei Zhu Prof. Mingwei Chen Prof. Masayoshi Ishida Prof. Haoshen Zhou |
| Affiliation: | 1. Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Umezono 1‐1‐1, Tsukuba, 305‐8568 (Japan);2. Graduate School of System and Information Engineering, University of Tsukuba, Tennoudai 1‐1‐1, Tsukuba, 305‐8573 (Japan);3. WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980‐8577 (Japan);4. National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (AIST) (Japan);5. National Laboratory of Solid State Microstructures & Department of Energy Science and Engineering, Nanjing University, Nanjing 210093 (China) |
| Abstract: | A layered composite with P2 and O3 integration is proposed toward a sodium‐ion battery with high energy density and long cycle life. The integration of P2 and O3 structures in this layered oxide is clearly characterized by XRD refinement, SAED and HAADF and ABF‐STEM at atomic resolution. The biphase synergy in this layered P2+O3 composite is well established during the electrochemical reaction. This layered composite can deliver a high reversible capacity with the largest energy density of 640 mAh g?1, and it also presents good capacity retention over 150 times of sodium extraction and insertion. |
| Keywords: | layered structures composite materials NaxMO2 polytypes sodium‐ion cathodes |