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Ci N, Hu Y, Li Q, Cheng J, Zhang H, Li D, Li K, Reddy KM, Ci L, Xie G, Liu X, Qiu HJ. Cycling Reconstructed Hierarchical Nanoporous High-Entropy Oxides with Continuously Increasing Capacity for Li Storage. SMALL METHODS 2024; 8:e2301322. [PMID: 38135872 DOI: 10.1002/smtd.202301322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 12/08/2023] [Indexed: 12/24/2023]
Abstract
High-entropy oxides (HEOs) have been showing great promise in a wide range of applications. There remains a lack of clarity regarding the influence of nanostructure and composition on their Li storage performance. Herein, a dealloying technique to synthesize hierarchical nanoporous HEOs with tunable compositions is employed. Building upon the extensively studied quinary AlFeNiCrMnOx, an additional element (Co, V, Ti, or Cu) is introduced to create senary HEOs, allowing for investigation of the impact of the added component on Li storage performance. With higher specific surface areas and oxygen vacancy concentrations, all their HEOs exhibit high Li storage performances. Remarkably, the senary HEO with the addition of V (AlNiFeCrMnVOx) achieves an impressive capacity of 730.2 mAh g-1 at 2.0 A g-1, which surpasses all reported performance of HEOs. This result demonstrates the synergistic interaction of the six elements in one HEO nanostructure. Additionally, the battery cycling-induced reconstruction and cation diffusion in the HEOs is uncovered, which results in an initial capacity decrease followed by a subsequent continuous capacity increase and enhanced Li ion diffusion. The results highlight the crucial roles played by both nanoporous structure design and composition optimization in enhancing Li storage of HEOs.
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Affiliation(s)
- Naixuan Ci
- School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Yixuan Hu
- Frontier Research Center for Materials Structure, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Qingqing Li
- School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Jun Cheng
- School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Hongqiang Zhang
- School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Deping Li
- School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Kaikai Li
- School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Kolan Madhav Reddy
- Frontier Research Center for Materials Structure, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Lijie Ci
- School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China
- State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Guoqiang Xie
- School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Xingjun Liu
- School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Hua-Jun Qiu
- School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China
- Shenzhen Key Laboratory of Advanced Functional Carbon Materials Research and Comprehensive Application, Harbin Institute of Technology, Shenzhen, 518055, China
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