XPS and SIMS studies of biodegradable suture materials

Brinen, J. S.; Greenhouse, S.; Jarrett, Peter

doi:10.1002/sia.740170507

Cited by 15 publications

(10 citation statements)

References 5 publications

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“… 74 The −C–O may originate from a number of compounds, including esters −C(=O)–O–. 32 , 75 Initially, the peak at 290.6 eV that corresponds to −CO 3 increases after SEI formation and then gradually decreases with cycle number, likely due to further decomposition although coverage from other SEI species cannot be excluded. The F 1s spectra show a main peak at about 687.3 eV, which is primarily attributable to the PVDF binder, and its decreasing intensity with increasing cycle number is consistent with increasing SEI coverage.…”

Section: Resultsmentioning

confidence: 99%

“… 79 − 81 The O 1s spectra show a small peak at 528.2 eV corresponding to Li 2 O and two peaks at 533.9 and 531.8 eV corresponding to −C–O and carbonates, respectively. 32 , 75 , 82 It should be noted that the pristine sample contains only small contributions from oxygen-containing species, as apparent from the low signal-to-noise ratio.…”

Section: Resultsmentioning

confidence: 99%

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Cycle-Induced Interfacial Degradation and Transition-Metal Cross-Over in LiNi_0.8Mn_0.1Co_0.1O₂–Graphite Cells

Björklund

Dose

et al. 2022

Chem. Mater.

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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 LiNi 0.8 Mn 0.1 Co 0.1 O 2 –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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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Cycle-Induced Interfacial Degradation and Transition-Metal Cross-Over in LiNi_0.8Mn_0.1Co_0.1O₂–Graphite Cells

Björklund

Dose

et al. 2022

Chem. Mater.

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“…biodegradable and -medical copolyester XPS, TOF-SIMS Lang et al general discussion on the determination of structure and reactivity at the surfaces of materials used in biology by XPS and SIMS XPS, SIMS Gardella and deGatica 2 biodegradable suture materials XPS, SIMS Brinen et al modified PLA and PLGA films XPS Kiss et al …”

Section: 22 Other Surface Characterization Techniquesmentioning

confidence: 99%

Surface Chemistry of Biodegradable Polymers for Drug Delivery Systems

2005

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“…There is a claim that careful “ratioing” of MS intensities yields copolymer sequence (Galuska, 1996). Other systems studied include copoly (ether‐ester)s (Bhatia & Burrell, 1991; Burrell, Bhatia, & Michael RS, 1994) glycolide/trimethylene carbonate copolymers (Brinen et al, 1993; Brinen, Greenhouse, & Jarrett, 1991), ethylene/vinylacvetate (Galuska, 1994), nylon6/nylon66 (Briggs, 1987), and some copolymers containing ethyl methacrylate (Briggs & Ratner, 1988; Lub et al, 1989).…”

Section: Copolymer Compositionmentioning

confidence: 99%

Mass spectra of copolymers

Montaudo¹

2002

Mass Spectrometry Reviews

104

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Recent and older literature (covering the last 12-13 years) in the field of mass spectra of random and block copolymers is reviewed. A detailed description is given of the information on copolymer properties that can be recovered from the analysis of the low-mass region of the spectrum (the region below 500 Da) and the high-mass region. The features of mass spectra of copolymers obtained by different synthetic routes are discussed, such as free radical, condensation, ring-chain equilibration, microbial synthesis, ring-opening, simple anionic, cationic, Ziegler-Natta, and/or metallocene catalysis, along with some random and block copolymers that occur in Nature. The emphasis is on copolymer composition and average molar mass determination, and on the benefits of coupling mass spectrometry (MS) with separation techniques such as size-exclusion chromatography (SEC) and high performance liquid chromatography (HPLC).

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XPS and SIMS studies of biodegradable suture materials

Cited by 15 publications

References 5 publications

Cycle-Induced Interfacial Degradation and Transition-Metal Cross-Over in LiNi_0.8Mn_0.1Co_0.1O₂–Graphite Cells

Cycle-Induced Interfacial Degradation and Transition-Metal Cross-Over in LiNi_0.8Mn_0.1Co_0.1O₂–Graphite Cells

Surface Chemistry of Biodegradable Polymers for Drug Delivery Systems

Mass spectra of copolymers

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XPS and SIMS studies of biodegradable suture materials

Cited by 15 publications

References 5 publications

Cycle-Induced Interfacial Degradation and Transition-Metal Cross-Over in LiNi0.8Mn0.1Co0.1O2–Graphite Cells

Cycle-Induced Interfacial Degradation and Transition-Metal Cross-Over in LiNi0.8Mn0.1Co0.1O2–Graphite Cells

Surface Chemistry of Biodegradable Polymers for Drug Delivery Systems

Mass spectra of copolymers

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Product

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Cycle-Induced Interfacial Degradation and Transition-Metal Cross-Over in LiNi_0.8Mn_0.1Co_0.1O₂–Graphite Cells

Cycle-Induced Interfacial Degradation and Transition-Metal Cross-Over in LiNi_0.8Mn_0.1Co_0.1O₂–Graphite Cells