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Yan L, Wang L, Liu Q, Tian H, Tan W, Xia Z, Wei D, Zhao K, Huang QA, Xi L, Zhang J. Band engineering enhances the electrochemical properties by constructing TiO 2 NRs-MoS 2 NSFs flexible electrode. J Colloid Interface Sci 2023; 650:892-900. [PMID: 37450978 DOI: 10.1016/j.jcis.2023.07.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 06/24/2023] [Accepted: 07/02/2023] [Indexed: 07/18/2023]
Abstract
Research and development of flexible electrodes with high performance are crucial to largely determine the performance of flexible lithium-ion batteries (FLIBs) to a large extent. In this work, a flexible anode (TiO2 NRs-MoS2 NSFs/CC) is rationally designed and successfully constructed, in which TiO2 nanorods arrays (NRs) vertically grown on CC as a supporting backbone for MoS2 nanosheets flowers (NSFs) to form a TiO2 NRs-MoS2 NSFs heterostructure. The backbone can not only serve as a mechanical support MoS2 and improve its electronic conductivity, but also limit the dissolution of polysulfides issue during cycling. The density functional theory (DFT) analysis manifests that the obvious interaction between O and S at the interface for the TiO2 NRs-MoS2 NSFs heterostructure changes the electronic structure and reduces the band gap of TiO2 NRs-MoS2 NSFs. The small band gap and high electron state at the Fermi level are both beneficial to the transport of electrons, enhancing the kinetics, and giving the long cycling stability at high density and excellent rate capacity. Furthermore, the assembled TiO2 NRs-MoS2 NSFs/CC//NCM622 full cell delivers superior rate capacity and good cycling stability. Meanwhile, the soft-packed cell shows good mechanical flexibility, which can be lighted up successfully and keep brightness when folding with different angles. This result illustrates that it is a highly potential strategy for constructing flexible electrodes with the controlled electronic structure through band engineering to not only improve the electrochemical performance, but also possibly meet the requirements of high-performance FLIBs.
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Affiliation(s)
- Li Yan
- Institute for Sustainable Energy/College of Science, Shanghai University, 99 Shangda Road, Shanghai 200444, PR China
| | - Linlin Wang
- Institute for Sustainable Energy/College of Science, Shanghai University, 99 Shangda Road, Shanghai 200444, PR China.
| | - Qi Liu
- Institute for Sustainable Energy/College of Science, Shanghai University, 99 Shangda Road, Shanghai 200444, PR China
| | - Haoyu Tian
- Institute for Sustainable Energy/College of Science, Shanghai University, 99 Shangda Road, Shanghai 200444, PR China
| | - Wenqi Tan
- Institute for Sustainable Energy/College of Science, Shanghai University, 99 Shangda Road, Shanghai 200444, PR China
| | - Zijie Xia
- Institute for Sustainable Energy/College of Science, Shanghai University, 99 Shangda Road, Shanghai 200444, PR China
| | - Denghu Wei
- Department of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, PR China
| | - Kangning Zhao
- Laboratory of Advanced Separations (LAS) École Polytechnique Fédérale de Lausanne (EPFL), Sion CH-1950, Switzerland
| | - Qiu-An Huang
- Institute for Sustainable Energy/College of Science, Shanghai University, 99 Shangda Road, Shanghai 200444, PR China
| | - Lili Xi
- Materials Genome Institute, Shanghai University, Shanghai 200444, PR China.
| | - Jiujun Zhang
- Institute for Sustainable Energy/College of Science, Shanghai University, 99 Shangda Road, Shanghai 200444, PR China
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Wang F, Li F, Ma L, Zheng M. Few-Layer MoS 2 Nanosheets Encapsulated in N-Doped Carbon Hollow Spheres as Long-Life Anode Materials for Lithium-Ion Batteries. Chemistry 2019; 25:14598-14603. [PMID: 31475405 DOI: 10.1002/chem.201902624] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 08/14/2019] [Indexed: 02/03/2023]
Abstract
Two-dimensional molybdenum disulfide (MoS2 ) has been recognized as a promising anode material for lithium-ion batteries (LIBs) due to its high theoretical capacity, but its rapid capacity decay owing to poor conductivity, structure pulverization, and polysulfide dissolution presents significant challenges in practical applications. Herein, triple-layered hollow spheres in which MoS2 nanosheets are fully encapsulated between inner carbon and outer nitrogen-doped carbon (NC) were fabricated. Such an architecture provides high conductivity and efficient lithium-ion transfer. Moreover, the NC shell prevents aggregation and exfoliation of MoS2 nanosheets and thus maintains the integrity of the nanostructure during the charge/discharge process. As anode materials for LIBs, the C@MoS2 @NC hollow spheres deliver a high reversible capacity (747 mA h g-1 after 100 cycles at 100 mA g-1 ) and excellent long-cycle performance (650 mA h g-1 after 1000 cycles at 1.0 A g-1 ), which confirm its potential for high-performance LIBs.
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Affiliation(s)
- Faze Wang
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054, P.R. China.,Key Laboratory of Artificial Structure and Quantum Control, Ministry of Education, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China.,Walter Schottky Institut and Physik Department, Technische Universität München, Garching, 85748, Germany
| | - Fanggang Li
- Key Laboratory of Artificial Structure and Quantum Control, Ministry of Education, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China
| | - Li Ma
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China
| | - Maojun Zheng
- Key Laboratory of Artificial Structure and Quantum Control, Ministry of Education, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China
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