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Li Y, Shi Q, Yu X, Ning F, Liu G, Wang X, Wang J, Xu Y, Zhao Y. Trace Y Doping Regulated Bulk/Interfacial Reactions of P2-Layered Oxides for Ultrahigh-Rate Sodium-Ion Batteries. Small 2024:e2310756. [PMID: 38361223 DOI: 10.1002/smll.202310756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 12/26/2023] [Indexed: 02/17/2024]
Abstract
P2-phase layered cathodes play a pivotal role in sodium-ion batteries due to their efficient Na+ intercalation chemistry. However, limited by crystal disintegration and interfacial instability, bulk and interfacial failure plague their electrochemical performance. To address these challenges, a structural enhancement combined with surface modification is achieved through trace Y doping. Based on a synergistic combination of experimental results and density functional theory (DFT) calculations, the introduction of partial Y ions at the Na site (2d) acts as a stabilizing pillar, mitigating the electrostatic repulsions between adjacent TMO2 slabs and thereby relieving internal structural stress. Furthermore, the presence of Y effectively optimizes the Ni 3d-O 2p hybridization, resulting in enhanced electronic conductivity and a notable rapid charging ability, with a capacity of 77.3 mA h g-1 at 40 C. Concurrently, the introduction of Y also induces the formation of perovskite nano-islands, which serve to minimize side reactions and modulate interfacial diffusion. As a result, the refined P2-Na0.65 Y0.025 [Ni0.33 Mn0.67 ]O2 cathode material exhibits an exceptionally low volume variation (≈1.99%), an impressive capacity retention of 83.3% even at -40 °C after1500 cycles at 1 C.
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Affiliation(s)
- Yong Li
- Institute for Sustainable Energy/College of Science, Shanghai University, Shanghai, 200444, P. R. China
- Shaanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi'an University of Architecture and Technology, Xi'an, 710055, P. R. China
| | - Qinhao Shi
- Institute for Sustainable Energy/College of Science, Shanghai University, Shanghai, 200444, P. R. China
| | - Xuan Yu
- Institute for Sustainable Energy/College of Science, Shanghai University, Shanghai, 200444, P. R. China
| | - Fanghua Ning
- Institute for Sustainable Energy/College of Science, Shanghai University, Shanghai, 200444, P. R. China
| | - Guoliang Liu
- Shaanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi'an University of Architecture and Technology, Xi'an, 710055, P. R. China
| | - Xuan Wang
- Institute for Sustainable Energy/College of Science, Shanghai University, Shanghai, 200444, P. R. China
| | - Juan Wang
- Shaanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi'an University of Architecture and Technology, Xi'an, 710055, P. R. China
| | - YunHua Xu
- Shaanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi'an University of Architecture and Technology, Xi'an, 710055, P. R. China
| | - Yufeng Zhao
- Institute for Sustainable Energy/College of Science, Shanghai University, Shanghai, 200444, P. R. China
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