ORCID Profile
0000-0002-0310-9533
Current Organisations
Forschungszentrum Jülich
,
NSW Ministry of Health
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Publisher: Wiley
Date: 04-07-2023
Abstract: Effective electrolyte compositions are of primary importance in raising the performance of lithium‐ion batteries (LIBs). Recently, fluorinated cyclic phosphazenes in combination with fluoroethylene carbonate (FEC) have been introduced as promising electrolyte additives, which can decompose to form an effective dense, uniform, and thin protective layer on the surface of electrodes. Although the basic electrochemical aspects of cyclic fluorinated phosphazenes combined with FEC were introduced, it is still unclear how these two compounds interact constructively during operation. This study investigates the complementary effect of FEC and ethoxy(pentafluoro)cyclotriphosphazene (EtPFPN) in aprotic organic electrolyte in LiNi 0.5 Co 0.2 Mn 0.3 O ∥ SiO x /C full cells. The formation mechanism of lithium ethyl methyl carbonate (LEMC)‐EtPFPN interphasial intermediate products and the reaction mechanism of lithium alkoxide with EtPFPN are proposed and supported by Density Functional Theory calculations. A novel property of FEC is also discussed here, called molecular‐cling‐effect (MCE). To the best knowledge, the MCE has not been reported in the literature, although FEC belongs to one of the most investigated electrolyte additives. The beneficial MCE of FEC toward the sub‐sufficient solid‐electrolyte interphase forming additive compound EtPFPN is investigated via gas chromatography‐mass spectrometry, gas chromatography high resolution‐accurate mass spectrometry, in situ shell‐isolated nanoparticle‐enhanced Raman spectroscopy, and scanning electron microscopy.
Publisher: American Chemical Society (ACS)
Date: 26-01-2023
Publisher: Wiley
Date: 28-10-2022
Abstract: Lithium‐ion batteries (LIBs) have transformed the use of mobile electronics and storage technologies. Alongside advances in materials, an in‐depth understanding of the interfacial phenomena and interphase formation mechanisms in LIBs is crucial. Interphases are widely recognized as the most important and the least understood components of LIBs and play a direct role in defining cell performance, cyclability, and safety. This article presents a review of recent developments in vibrational spectroscopy techniques of Raman, infrared, and sum‐frequency generation spectroscopies to probe the fundamental aspects of interphases on the anode and cathode of LIBs. First the vibrational spectroscopy techniques and their relevant technical considerations for interphase characterization are briefly introduced. In the next step, the latest studies on the fundamental properties, composition, and structure of interphases employing vibrational spectroscopy techniques are presented. This review focuses on in situ / operando investigations however, post‐mortem studies are also discussed briefly.
Publisher: OAE Publishing Inc.
Date: 2023
DOI: 10.20517/ENERGYMATER.2023.07
Abstract: Research on lithium metal as a high-capacity anode for future lithium metal batteries (LMBs) is currently at an all-time high. To date, the different influences of a highly pure argon glovebox (GB) and an industry-relevant ambient dry room (DR) atmosphere have received little attention in the scientific community. In this paper, we report on the impact of in coin cell atmosphere (ICCA) on the performance of an LMB as well as its interphase characteristics and properties in combination with three organic carbonate-based electrolytes with and without two well-known interphase-forming additives, namely fluoroethylene carbonate (FEC) and vinylene carbonate (VC). The results obtained from this carefully executed systematic study show a substantial impact of the ICCA on solid electrolyte interphase (SEI) resistance (RSEI) and lithium stripping lating homogeneity. In a transition metal cathode (NMC811) containing LMBs, a DR ICCA results in an up to 50% increase in lifetime due to the improved chemical composition of the cathode electrolyte interphase (CEI). Furthermore, different impacts on electrode characteristics and cell performance were observed depending on the utilized functional additive. Since this study focuses on a largely overlooked influential factor of LMB performance, it highlights the importance of comparability and transparency in published research and the importance of taking differences between research and industrial environments into consideration in the aim of establishing and commercializing LMB cell components.
Publisher: Wiley
Date: 24-05-2023
Abstract: Increasing the cell voltage of lithium‐ion batteries (LIBs) is a straightforward approach to increasing their capacity and energy density. However, state‐of‐the‐art cathode materials like LiNi x Mn y Co 1‐x‐y O 2 (NMC) suffer from severe failure mechanisms at high operating voltages, significantly degrading the performance and cycle life of the cells. Notably, an effective cathode electrolyte interphase (CEI) mitigates these failure mechanisms. Nevertheless, a deep understanding of the formation mechanisms and properties of the CEI is necessary to tailor effective interphases. This study introduces a promising electrolyte additive for high operating voltage NMC811||graphite cells. Implementing an optimized concentration of 3‐thiophene boronic acid (3‐Thp‐BOH) significantly enhances the cells' performance and reduces capacity fading, resulting in a quadrupled cycle life and a six‐times higher accumulated specific energy. Operando shell‐isolated nanoparticle‐enhanced Raman spectroscopy (SHINERS) is employed to shed light on the formation mechanism and molecular composition of CEI during cell operation, proving that the presence of the additive results in the formation of a complex 3‐Thp‐BOH‐based polymeric CEI on the NMC811 surface. The CEI investigation is additionally supported by scanning electron microscopy and energy dispersive X‐ray analysis and highly accurate quantum chemistry modeling of the suggested polymerization mechanisms.
Publisher: MDPI AG
Date: 29-08-2023
DOI: 10.3390/HEALTHCARE11172414
Abstract: The efficacy of lifestyle interventions for reduced gestational weight gain (GWG) is established, but evidence of their effectiveness is limited. The Get Healthy in Pregnancy (GHiP) program is a telephone health coaching program supporting healthy GWG delivered state-wide in New South Wales, Australia. This evaluation explores the impact of GHiP on behavioural outcomes and GWG, analysing GHiP participant data (n = 3702 for 2018–2019). We conducted McNamar’s tests to explore within-in idual change for behavioural outcomes and logistic regression to assess associations between demographic characteristics, participant engagement and behavioural and weight outcomes for women who completed the program. Participants who completed ten coaching calls made significant improvements (all p 0.001) in more health-related behaviours (walking, vigorous physical activity, vegetable consumption, takeaway meals and sweetened drink consumption) than those who completed fewer calls. Among women with valid weight change data (n = 245), 31% gained weight below, 33% gained weight within, and 36% gained weight above GWG guidelines. Pre-pregnancy BMI was the only factor significantly associated with meeting GWG guidelines. Women with pre-pregnancy overweight and obesity had lower odds than those with a healthy weight of having GWG within the guidelines. The majority of these women did not gain weight above the guidelines. A higher proportion of women with pre-pregnancy obesity gained weight below the guidelines (33.8%) than above the guidelines (28.5%). GHiP has the potential to support all pregnant women, including those with pre-pregnancy obesity, to achieve a healthier pregnancy.
Publisher: Wiley
Date: 03-02-2021
DOI: 10.1111/AJO.13316
No related grants have been discovered for Justine Salisbury.