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Wang H, Li N, Sun J, Wang P. Nitrogen-Doped CoP with optimized d-Band center as bidirectional electrocatalyst for high areal capacity of Li-S battery. J Colloid Interface Sci 2024; 665:702-710. [PMID: 38552585 DOI: 10.1016/j.jcis.2024.03.165] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 03/11/2024] [Accepted: 03/25/2024] [Indexed: 04/17/2024]
Abstract
Lithium polysulfide (LiPSs) shuttle effect and difficulties with Li2S oxidation are hinder the marketization of lithium-sulfur batteries. We suggest using a bidirectional catalyst in the sulfur host to solve these problems. We produced a nitrogen-doped cobalt phosphide (N-CoP@NC) as a sulfur carrier in this work. The introduction of nitrogen into cobalt phosphide enhances the electron transmission speed and forms shorter Co-N bonds. As a result, new defect energy levels are introduced, leading to an increase in the charge number of Co central atoms, which abate the Li-S and SS bonds in Li2S and Li2S4, thereby promoting the oxidation of Li2S during charging, as well as the alteration process of LiPSs during charge and discharge. Additionally, the crystal flaws that result in increased Co-S bond formation help to boost polysulfides' adsorption ability. The Li-S batteries shows outstanding cyclability when paired with this electrocatalyst, demonstrating a minimal capacity degradation rate of only 0.07 % per cycle over 500 cycles at a rate of 0.5C. As a result, incorporating anion doping in the host emerges as a promising method for crafting materials tailored for Li-S batteries.
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Affiliation(s)
- Haopeng Wang
- Hebei Key Laboratory of Flexible Functional Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China
| | - Na Li
- Hebei Key Laboratory of Flexible Functional Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China.
| | - Jinfeng Sun
- Hebei Key Laboratory of Flexible Functional Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China
| | - Peng Wang
- Hebei Key Laboratory of Flexible Functional Materials, School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China.
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Lang X, Wang T, Wang Z, Qu T, Li L, Yao C, Lai Q, Cai K. Ti x+ in-situ intercalation and interlayer modification via titanium foil/vanadium ion solution interface of VO 2.375 as sulfur-wrapped matrix enabling long-life lithium sulfur battery. J Colloid Interface Sci 2024; 659:560-568. [PMID: 38198933 DOI: 10.1016/j.jcis.2024.01.036] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2023] [Revised: 12/31/2023] [Accepted: 01/05/2024] [Indexed: 01/12/2024]
Abstract
Lithium sulfur battery (LSB) has great potential as a promising next-generation energy storage system owing to ultra-high theoretical specific capacity and energy density. However, the polysulfide shuttle effect and slow redox kinetics are recognized the most stumbling blocks on the way of commercializing LSB. On this account, for the first time, we use Tix+ in-situ intercalation strategy via titanium foil/vanadium ion (V5+) solution interface to modify the layer of vanadium oxide for long cycle LSB. The inserted Tix+ strengthens interlayer interaction and enhances lithium-ion mobility rate. Meanwhile, based on density functional theory (DFT) calculation, the mixed valence of V5+/V4+ in the vanadium oxide structure reduces the stress and strain of lithium-ion intercalation through the interlayer support of titanium ions (Tix+). Also, Tix+ refines the structural stability of the sulfur wrapped composite matrix so as to facilitate the LiPSs transformation, and improve the electrochemical performances. Consequently, the Ti-VO2.375/S cathode delivers a lower capacity decay of 0.037 % per cycle over 1500 cycles with a stable coulombic efficiency around 100 %.
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Affiliation(s)
- Xiaoshi Lang
- Institute of Advanced Chemical Power Source, College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013, Liaoning, China
| | - Tan Wang
- Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Zhenhua Wang
- Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.
| | - Tingting Qu
- Institute of Advanced Chemical Power Source, College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013, Liaoning, China; MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China
| | - Lan Li
- Institute of Advanced Chemical Power Source, College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013, Liaoning, China
| | - Chuangang Yao
- Institute of Advanced Chemical Power Source, College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013, Liaoning, China
| | - Qinzhi Lai
- School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, Hebei Province, China
| | - Kedi Cai
- Institute of Advanced Chemical Power Source, College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013, Liaoning, China.
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Wu L, Hu Y, Chen Z, Cai C, Cai C, Mei T, Lin L, Wang X. Oxygen vacancies engineering in hollow and porous MnCo2O4 nanoflowers-coated separators for advanced Li-S batteries. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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