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Chu J, Zhang C, Wu X, Xing L, Zhang J, Zhang L, Wang H, Wang W, Yu Q. Short-Range Graphitic Nanodomains in Hypocrystalline Carbon Nanotubes Realize Fast Potassium Ion Migration and Multidirection Stress Release. Small 2023:e2304406. [PMID: 37616512 DOI: 10.1002/smll.202304406] [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: 05/25/2023] [Revised: 07/24/2023] [Indexed: 08/26/2023]
Abstract
Defect-rich carbon materials are considered as one of the most promising anodes for potassium-ion batteries due to their enormous adsorption sites of K+ , while the realization of both rate capability and cycling stability is still greatly limited by unstable electrochemical kinetics and inevitable structure degradation. Herein, an Fe3+ -induced hydrothermal-pyrolysis strategy is reported to construct well-tailored hybrid carbon nanotubes network architecture (PP-CNT), in which the short-range graphitic nanodomains are in-situ localized in the pea pod shape hypocrystalline carbon. The N,O codoped hypocrystalline carbon region contributes to abundant defect sites for potassium ion storage, ensuring high reversible capacity. Meanwhile, the short-range graphitic nanodomains with expanded interlayer spacing facilitate stable K+ migration and fast electron transfer. Furthermore, the finite element analysis confirms the volume expansion caused by K+ intercalation can be availably buffered due to the multidirection stress release effect of the unique porous pea pod shape, endowing carbon nanotubes with superior structural integrity. Consequently, the PP-CNT anode exhibits superior potassium-storage performance, including high reversible capacity, exceptional rate capability, and ultralong cycling stability. This work opens a new avenue for the fabrication of advanced carbon materials for achieving durable and fast potassium storage.
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Affiliation(s)
- Jianhua Chu
- School of Metallurgical Engineering, Anhui University of Technology, Maanshan, Anhui Province, 243002, China
| | - Chaojie Zhang
- School of Metallurgical Engineering, Anhui University of Technology, Maanshan, Anhui Province, 243002, China
| | - Xiaowei Wu
- State Key Laboratory of Explosion Science and Technology, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing, 100081, China
| | - Lidong Xing
- School of Metallurgy and Ecology, University of Science and Technology Beijing, Beijing, 100083, China
| | - Jianguo Zhang
- State Key Laboratory of Explosion Science and Technology, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing, 100081, China
| | - Liqiang Zhang
- School of Metallurgical Engineering, Anhui University of Technology, Maanshan, Anhui Province, 243002, China
| | - Haichuan Wang
- School of Metallurgical Engineering, Anhui University of Technology, Maanshan, Anhui Province, 243002, China
| | - Wei Wang
- School of Metallurgy and Ecology, University of Science and Technology Beijing, Beijing, 100083, China
| | - Qiyao Yu
- State Key Laboratory of Explosion Science and Technology, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing, 100081, China
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