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Xu J, Ma G, Wang N, Zhao S, Zhou J. Borderline Metal Centers on Nonporous Metal-Organic Framework Nanowire Boost Fast Li-Ion Interfacial Transport of Composite Polymer Electrolyte. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2204163. [PMID: 36047653 DOI: 10.1002/smll.202204163] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Indexed: 06/15/2023]
Abstract
Metal-organic frameworks (MOFs) fillers are emerging for composite polymer electrolytes (CPEs). Enhancing Lewis acid-base interaction (LABI) among MOFs, polymer and Li-salt is expected to promote Li+ -transport. However, it is unclear how to customize a strong LABI interface. The large surface-area of classical MOFs also interferes with clarifying the LABI influence on Li+ -transport. Herein, Bi3+ as metal centers to design colloidal-dispersed nonporous MOFs (Bi/HMT-MOFs) nanowire with a surface-area of only 17.13 m2 g-1 to prepare polyethylene oxide (PEO)-based CPEs (BMCPE) is chosen. The nonporous feature can exclude the surface-area effect on Li+ -transport. More interestingly, Bi3+ is a typical borderline acid, which can interact with both hard-basic PEO and soft-basic Li-salt anion. Accordingly, Bi/HMT-MOFs are uniformly dispersed in the BMCPE to form a strong LABI interface with PEO and Li-salt, promoting Li-salt dissociation and providing rapid Li+ -transport channels. Despite the ultralow surface-area of Bi/HMT-MOFs, BMCPE exhibits significantly enhanced ion-conductivity and Li+ transference number, which completely rival traditional MOFs-filled CPEs. BMCPE also enables symmetric and full cells with excellent high-rate performance and long-term cycling stability. In contrast, when Bi3+ sites are obscured, electrochemical performances are obviously decreased. Therefore, employing borderline metal centers will be an effective strategy to construct a LABI interface for high-performance MOFs-filled CPEs.
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Affiliation(s)
- Jianqi Xu
- State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Guixin Ma
- State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Ning Wang
- State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Simin Zhao
- State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Jisheng Zhou
- State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
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2
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Björklund E, Xu C, Dose WM, Sole CG, Thakur PK, Lee TL, De Volder MFL, Grey CP, Weatherup RS. Cycle-Induced Interfacial Degradation and Transition-Metal Cross-Over in LiNi 0.8Mn 0.1Co 0.1O 2-Graphite Cells. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2022; 34:2034-2048. [PMID: 35557994 PMCID: PMC9082506 DOI: 10.1021/acs.chemmater.1c02722] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2021] [Revised: 01/08/2022] [Indexed: 05/21/2023]
Abstract
Ni-rich lithium nickel manganese cobalt (NMC) oxide cathode materials promise Li-ion batteries with increased energy density and lower cost. However, higher Ni content is accompanied by accelerated degradation and thus poor cycle lifetime, with the underlying mechanisms and their relative contributions still poorly understood. Here, we combine electrochemical analysis with surface-sensitive X-ray photoelectron and absorption spectroscopies to observe the interfacial degradation occurring in LiNi0.8Mn0.1Co0.1O2-graphite full cells over hundreds of cycles between fixed cell voltages (2.5-4.2 V). Capacity losses during the first ∼200 cycles are primarily attributable to a loss of active lithium through electrolyte reduction on the graphite anode, seen as thickening of the solid-electrolyte interphase (SEI). As a result, the cathode reaches ever-higher potentials at the end of charge, and with further cycling, a regime is entered where losses in accessible NMC capacity begin to limit cycle life. This is accompanied by accelerated transition-metal reduction at the NMC surface, thickening of the cathode electrolyte interphase, decomposition of residual lithium carbonate, and increased cell impedance. Transition-metal dissolution is also detected through increased incorporation into and thickening of the SEI, with Mn found to be initially most prevalent, while the proportion of Ni increases with cycling. The observed evolution of anode and cathode surface layers improves our understanding of the interconnected nature of the degradation occurring at each electrode and the impact on capacity retention, informing efforts to achieve a longer cycle lifetime in Ni-rich NMCs.
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Affiliation(s)
- Erik Björklund
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K.
- The
Faraday Institution, Quad One, Harwell Science
and Innovation Campus, Didcot OX11 0RA, U.K.
| | - Chao Xu
- The
Faraday Institution, Quad One, Harwell Science
and Innovation Campus, Didcot OX11 0RA, U.K.
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
| | - Wesley M. Dose
- The
Faraday Institution, Quad One, Harwell Science
and Innovation Campus, Didcot OX11 0RA, U.K.
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
- Department
of Engineering, University of Cambridge, 17 Charles Babbage Road, Cambridge CB3 0FS, U.K.
| | - Christopher G. Sole
- The
Faraday Institution, Quad One, Harwell Science
and Innovation Campus, Didcot OX11 0RA, U.K.
| | - Pardeep K. Thakur
- Diamond
Light Source, Harwell Science and Innovation
Campus, Fermi Avenue, Didcot OX11 0DE, U.K.
| | - Tien-Lin Lee
- The
Faraday Institution, Quad One, Harwell Science
and Innovation Campus, Didcot OX11 0RA, U.K.
- Diamond
Light Source, Harwell Science and Innovation
Campus, Fermi Avenue, Didcot OX11 0DE, U.K.
| | - Michael F. L. De Volder
- The
Faraday Institution, Quad One, Harwell Science
and Innovation Campus, Didcot OX11 0RA, U.K.
- Department
of Engineering, University of Cambridge, 17 Charles Babbage Road, Cambridge CB3 0FS, U.K.
| | - Clare P. Grey
- The
Faraday Institution, Quad One, Harwell Science
and Innovation Campus, Didcot OX11 0RA, U.K.
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
| | - Robert S. Weatherup
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K.
- The
Faraday Institution, Quad One, Harwell Science
and Innovation Campus, Didcot OX11 0RA, U.K.
- Diamond
Light Source, Harwell Science and Innovation
Campus, Fermi Avenue, Didcot OX11 0DE, U.K.
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3
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Affiliation(s)
- Brian A. Collins
- Physics and Astronomy Washington State University Pullman Washington USA
| | - Eliot Gann
- Material Measurement Laboratory National Institute of Standards and Technology Gaithersburg Maryland USA
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4
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Sunday DF, Thelen JL, Zhou C, Ren J, Nealey PF, Kline RJ. Buried Structure in Block Copolymer Films Revealed by Soft X-ray Reflectivity. ACS NANO 2021; 15:9577-9587. [PMID: 34014640 DOI: 10.1021/acsnano.0c09907] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Interactions between polymers and surfaces can be used to influence properties including mechanical performance in nanocomposites, the glass transition temperature, and the orientation of thin film block copolymers (BCPs). In this work we investigate how specific interactions between the substrate and BCPs with varying substrate affinity impact the interfacial width between polymer components. The interface width is generally assumed to be a function of the BCP properties and independent of the surface affinity or substrate proximity. Using resonant soft X-ray reflectivity the optical constants of the film can be controlled by changing the incident energy, thereby varying the depth sensitivity of the measurement. Resonant soft X-ray reflectivity measurements were conducted on films of polystyrene-b-poly(2-vinylpyridine) (PS-b-P2VP) and PS-b-poly(methyl methacrylate) (PS-b-PMMA), where the thickness of the film was varied from half the periodicity (L0) of the BCP to 5.5 L0. The results of this measurement on the PS-b-P2VP films show a significant expansion of the interface width immediately adjacent to the surface. This is likely caused by the strong adsorption of P2VP to the substrate, which constrains the mobility of the junction points, preventing them from reaching their equilibrium distribution and expanding the observed interface width. The interface width decays toward equilibrium moving away from the substrate, with the decay rate being a function of film thickness below a critical limit. The PMMA block appears to be more mobile, and the BCP interfaces near the substrate match their equilibrium value.
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Affiliation(s)
- Daniel F Sunday
- Materials Science and Engineering Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Jacob L Thelen
- Materials Science and Engineering Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Chun Zhou
- Institute for Molecular Engineering, University of Chicago, 5801 S Ellis Ave, Chicago, Illinois 60637, United States
| | - Jiaxing Ren
- Institute for Molecular Engineering, University of Chicago, 5801 S Ellis Ave, Chicago, Illinois 60637, United States
| | - Paul F Nealey
- Institute for Molecular Engineering, University of Chicago, 5801 S Ellis Ave, Chicago, Illinois 60637, United States
| | - R Joseph Kline
- Materials Science and Engineering Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
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5
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Direct insights into the role of epoxy groups on cobalt sites for acidic H 2O 2 production. Nat Commun 2020; 11:4181. [PMID: 32826877 PMCID: PMC7442824 DOI: 10.1038/s41467-020-17782-5] [Citation(s) in RCA: 98] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 07/17/2020] [Indexed: 11/23/2022] Open
Abstract
Hydrogen peroxide produced by electrochemical oxygen reduction reaction provides a potentially cost effective and energy efficient alternative to the industrial anthraquinone process. In this study, we demonstrate that by modulating the oxygen functional groups near the atomically dispersed cobalt sites with proper electrochemical/chemical treatments, a highly active and selective oxygen reduction process for hydrogen peroxide production can be obtained in acidic electrolyte, showing a negligible amount of onset overpotential and nearly 100% selectivity within a wide range of applied potentials. Combined spectroscopic results reveal that the exceptionally enhanced performance of hydrogen peroxide generation originates from the presence of epoxy groups near the Co–N4 centers, which has resulted in the modification of the electronic structure of the cobalt atoms. Computational modeling demonstrates these electronically modified cobalt atoms will enhance the hydrogen peroxide productivity during oxygen reduction reaction in acid, providing insights into the design of electroactive materials for effective peroxide production. The production of hydrogen peroxide by electrochemical oxygen reduction is an attractive alternative to the industrial process, but catalysts should be optimized. Here, the authors enhance hydrogen peroxide production in acidic media with epoxy groups near cobalt centers on carbon nanotubes.
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6
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Su GM, White W, Renna LA, Feng J, Ardo S, Wang C. Photoacid-Modified Nafion Membrane Morphology Determined by Resonant X-ray Scattering and Spectroscopy. ACS Macro Lett 2019; 8:1353-1359. [PMID: 35651146 DOI: 10.1021/acsmacrolett.9b00622] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Covalent attachment of photoacid dye molecules to perfluorinated sulfonic acid membranes is a promising route to enable active light-driven ion pumps, but the complex relationship between chemical modification and morphology is not well understood in this class of functional materials. In this study we demonstrate the effect of bound photoacid dyes on phase-segregated membrane morphology. Resonant X-ray scattering near the sulfur K-edge reveals that introduction of photoacid dyes to the end of the ionomer side chains enhances phase segregation among ionomer domains, and the ionomer domain spacing increases with increasing amount of bound dye. Furthermore, relative crystallinity is marginally enhanced within semicrystalline domains composed of the perfluorinated backbone. X-ray absorption spectroscopy coupled with first-principles density functional theory calculations suggest that above a critical concentration, the multiple hydrophilic groups on the attached photoacid dye may help increase residual water content and promote hydration of adjacent sulfonic acid side chains under dry or ambient conditions.
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Affiliation(s)
- Gregory M. Su
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - William White
- Department of Chemistry, University of California Irvine, Irvine, California 92697, United States
| | - Lawrence A. Renna
- Department of Chemistry, University of California Irvine, Irvine, California 92697, United States
| | - Jun Feng
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Shane Ardo
- Department of Chemistry, University of California Irvine, Irvine, California 92697, United States
- Department of Chemical Engineering & Biomolecular Engineering, University of California Irvine, Irvine, California 92697, United States
- Department of Materials Science & Engineering, University of California Irvine, Irvine, California 92697, United States
| | - Cheng Wang
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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7
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Greer DR, Stolberg MA, Xuan S, Jiang X, Balsara NP, Zuckermann RN. Liquid-Crystalline Phase Behavior in Polypeptoid Diblock Copolymers. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01952] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Douglas R. Greer
- College of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
| | | | | | | | - Nitash P. Balsara
- College of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
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8
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Greer DR, Stolberg MA, Kundu J, Spencer RK, Pascal T, Prendergast D, Balsara NP, Zuckermann RN. Universal Relationship between Molecular Structure and Crystal Structure in Peptoid Polymers and Prevalence of the cis Backbone Conformation. J Am Chem Soc 2018; 140:827-833. [DOI: 10.1021/jacs.7b11891] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Douglas R. Greer
- Materials
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- College
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
| | - Michael A. Stolberg
- Materials
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Joyjit Kundu
- Molecular
Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Ryan K. Spencer
- Department of Chemistry and Department of Chemical Engineering & Materials Science, University of California, Irvine, Irvine, California 92697, United States
| | - Tod Pascal
- Molecular
Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - David Prendergast
- Molecular
Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Nitash P. Balsara
- Materials
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- College
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
| | - Ronald N. Zuckermann
- Molecular
Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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