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Wen K, Huang L, Qu L, Deng T, Men X, Chen L, Wang J. g-C 3N 4/MoO 3 composite with optimized crystal face: A synergistic adsorption-catalysis for boosting cathode performance of lithium-sulfur batteries. J Colloid Interface Sci 2023; 649:890-899. [PMID: 37390536 DOI: 10.1016/j.jcis.2023.06.103] [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: 03/31/2023] [Revised: 06/07/2023] [Accepted: 06/15/2023] [Indexed: 07/02/2023]
Abstract
The commercial application of lithium-sulfur batteries (LSBs) has been seriously hindered by the shuttle effect of lithium polysulfides (LiPSs) and their slow redox kinetics. In this work, g-C3N4/MoO3 composed of graphite carbon nitride (g-C3N4) nanoflake and MoO3 nanosheet is designed and applied to modify the separator. The polar MoO3 can form chemical bond with LiPSs, effectively slowing down the dissolution of LiPSs. And based on the principle of "Goldilocks", LiPSs will be oxidized by MoO3 to thiosulfate, which will promote the rapid conversion from long-chain LiPSs to Li2S. Moreover, g-C3N4 can promote the electron transportation, and its high specific surface area can facilitate the deposition and decomposition of Li2S. What's more, the g-C3N4 promotes the preferential orientation on the MoO3(021) and MoO3(040) crystal planes, which optimizes the adsorption capacity of g-C3N4/MoO3 for LiPSs. As a result, the LSBs with g-C3N4/MoO3 modified separator with a synergistic adsorption-catalysis, can achieve an initial capacity of 542 mAh g-1 at 4C with capacity decay rate of 0.0053% per cycle for 700 cycles. This work achieves the synergy of adsorption and catalysis of LiPSs through the combination of two materials, providing a material design strategy for advanced LSBs.
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Affiliation(s)
- Kaining Wen
- Xi'an Key Laboratory of Clean Energy, Shaanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, PR China.
| | - Lin Huang
- Xi'an Key Laboratory of Clean Energy, Shaanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, PR China.
| | - Laitao Qu
- Xi'an Key Laboratory of Clean Energy, Shaanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, PR China.
| | - Teng Deng
- Xi'an Key Laboratory of Clean Energy, Shaanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, PR China.
| | - Xinliang Men
- Xi'an Key Laboratory of Clean Energy, Shaanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, PR China.
| | - Liping Chen
- Xi'an Key Laboratory of Clean Energy, Shaanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, PR China.
| | - Juan Wang
- Xi'an Key Laboratory of Clean Energy, Shaanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, PR China.
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Huang X, Sha W, He S, Zhao L, Li S, Lv C, Lou C, Xu X, Wang J, Pan H. Defect-rich Mo 2S 3 loaded wood-derived carbon acts as a spacer in lithium-sulfur batteries: forming a polysulfide capture net and promoting fast lithium flux. NANOSCALE 2023; 15:7870-7876. [PMID: 37060152 DOI: 10.1039/d3nr00580a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Due to the sluggish kinetics of sulfur conversion and the large volume change of the lithium anode, along with the formation of lithium dendrites, lithium-sulfur batteries (LSBs) usually exhibit severe capacity decay and poor cycle life. It is necessary to consider the factors associated with cathodes, separators and anodes in an integrated manner to solve the problems existing in LSBs. In this paper, a vertically aligned porous carbon decorated with transition metal sulfides was introduced between a cathode and an anode to comprehensively solve the problems of LSBs. Widely existing natural wood was used as the framework structure, and Mo2S3 with abundant sulfur vacancies was deposited into its channels. Theoretical calculations and experimental results have confirmed a low energy barrier for sulfur conversion and the presence of a strong electric field around the spacer, which benefits fast ion transportation. As a result, on employing the multifunctional spacer, LSB full cells delivered a high initial capacity and a long cycle life. This study provides a reference for reducing development cost, simplifying optimization steps and promoting the commercial application of LSBs.
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Affiliation(s)
- Xin Huang
- Heilongjiang Provincial Key Laboratory of Polymeric Composition Materials; School of Materials Science and Engineering, Qiqihar University, Qiqihar, 161006, P. R. China.
| | - Wanli Sha
- Heilongjiang Provincial Key Laboratory of Polymeric Composition Materials; School of Materials Science and Engineering, Qiqihar University, Qiqihar, 161006, P. R. China.
| | - Songchun He
- Heilongjiang Provincial Key Laboratory of Polymeric Composition Materials; School of Materials Science and Engineering, Qiqihar University, Qiqihar, 161006, P. R. China.
| | - Lijie Zhao
- Heilongjiang Provincial Key Laboratory of Polymeric Composition Materials; School of Materials Science and Engineering, Qiqihar University, Qiqihar, 161006, P. R. China.
| | - Shaobin Li
- Heilongjiang Provincial Key Laboratory of Polymeric Composition Materials; School of Materials Science and Engineering, Qiqihar University, Qiqihar, 161006, P. R. China.
| | - Chunmei Lv
- Heilongjiang Provincial Key Laboratory of Polymeric Composition Materials; School of Materials Science and Engineering, Qiqihar University, Qiqihar, 161006, P. R. China.
| | - Chunhua Lou
- Heilongjiang Provincial Key Laboratory of Polymeric Composition Materials; School of Materials Science and Engineering, Qiqihar University, Qiqihar, 161006, P. R. China.
| | - Xintong Xu
- Heilongjiang Provincial Key Laboratory of Polymeric Composition Materials; School of Materials Science and Engineering, Qiqihar University, Qiqihar, 161006, P. R. China.
| | - Jianxin Wang
- Heilongjiang Provincial Key Laboratory of Polymeric Composition Materials; School of Materials Science and Engineering, Qiqihar University, Qiqihar, 161006, P. R. China.
| | - Hong Pan
- Heilongjiang Provincial Key Laboratory of Polymeric Composition Materials; School of Materials Science and Engineering, Qiqihar University, Qiqihar, 161006, P. R. China.
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Rectangular Transition Metal-rTCNQ Organic Frameworks Enabling Polysulfide Anchoring and Fast Electrocatalytic Activity in Li-Sulfur Batteries: A Density Functional Theory Perspective. Molecules 2023; 28:molecules28052389. [PMID: 36903634 PMCID: PMC10005228 DOI: 10.3390/molecules28052389] [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: 01/26/2023] [Revised: 02/18/2023] [Accepted: 03/02/2023] [Indexed: 03/08/2023] Open
Abstract
Two-dimensional metal-organic frameworks (MOFs) have shown great development po-tential in the field of lithium-sulfur (Li-S) batteries. In this theoretical research work, we propose a novel 3d transition metals (TM)-embedded rectangular tetracyanoquinodimethane (TM-rTCNQ) as a potential high-performance sulfur host. The calculated results show that all TM-rTCNQ structures have excellent structural stability and metallic properties. Through exploring different adsorption patterns, we discovered that TM-rTCNQ (TM = V, Cr, Mn, Fe and Co) monolayers possess moderate adsorption strength for all polysulfide species, which is mainly due to the existence of the TM-N4 active center in these frame systems. Especially for the non-synthesized V-rCTNQ, the theoretical calculation fully predicts that the material has the most suitable adsorption strength for polysul-fides, excellent charging-discharging reaction and Li-ion diffusion performance. Additionally, Mn-rTCNQ, which has been synthesized experimentally, is also suitable for further experimental con-firmation. These findings not only provide novel MOFs for promoting the commercialization of Li-S batteries, but also provide unique insights for fully understanding their catalytic reaction mecha-nism.
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Ding X, Jiao W, Zhang D, Liu Y. Preparation of Co-S/NixSey/C@TiO2 composite electrode and the performance improvement strategies for the electrooxidation of H2O2. J Taiwan Inst Chem Eng 2023. [DOI: 10.1016/j.jtice.2023.104802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
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