Premelting, Melting, and Degradation Properties of Molten Alkali Nitrates: LiNO3, NaNO3, KNO3, and Binary NaNO3-KNO3

Mohammad, Mehedi Bin; Brooks, Geoffrey; Rhamdhani, M. Akbar

doi:10.1007/s11663-018-1205-z

Cited by 20 publications

(16 citation statements)

References 90 publications

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“…However, the in-depth study on this novel system is needed because little is known about the reaction mechanism conducted on the oxygen electrode. Furthermore, it should be noted that one of the component of the molent electrolyte, LiNO 3 , can be decomposed at high temperature and produces Li 2 O, [203] which happened to be the discharge product in this system claimed by the authors. Thus, in addition to the chemical titration analysis, quantitative measurement of pressure changes during discharging (as proposed by…”

Section: Lio 2 or LI 2 O As The Productmentioning

confidence: 73%

Understanding the Reaction Chemistry during Charging in Aprotic Lithium–Oxygen Batteries: Existing Problems and Solutions

et al. 2019

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The aprotic lithium-oxygen (Li-O 2 ) battery has excited huge interest due to its having the highest theoretical energy density among the different types of rechargeable battery. The facile achievement of a practical Li-O 2 battery has been proven unrealistic, however. The most significant barrier to progress is the limited understanding of the reaction processes occurring in the battery, especially during the charging process on the positive electrode. Thus, understanding the charging mechanism is of crucial importance to enhance the Li-O 2 battery performance and lifetime. Here, recent progress in understanding the electrochemistry and chemistry related to charging in Li-O 2 batteries is reviewed along with the strategies to address the issues that exist in the charging process at the present stage. The properties of Li 2 O 2 and the mechanisms of Li 2 O 2 oxidation to O 2 on charge are discussed comprehensively, as are the accompanied parasitic chemistries, which are considered as the underlying issues hindering the reversibility of Li-O 2 batteries. Based on the detailed discussion of the charging mechanism, innovative strategies for addressing the issues for the charging process are discussed in detail. This review has profound implications for both a better understanding of charging chemistry and the development of reliable rechargeable Li-O 2 batteries in the future.

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Section: Lio 2 or LI 2 O As The Productmentioning

confidence: 73%

Understanding the Reaction Chemistry during Charging in Aprotic Lithium–Oxygen Batteries: Existing Problems and Solutions

et al. 2019

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“…Melting temperature values of NaNO3 obtained by DSC method are between 574.55 K and 583 K. The post-hoc test shows that the following values stand alone: 574.55 K [101] and 583 K [136]. For the same reasons mentioned in the case of LiNO3, the lower value of Mohammad et al [101] is regarded as unreliable. The higher value (583 K) obtained by…”

Section: (I) Data From Dsc Methodsmentioning

confidence: 96%

“…Mohammad et al [101] gave the lowest temperature (517.95 K) among all those obtained by DTA method [84,100,[102][103][104]. This may be related to the low sensitivity of the DTA/TGA apparatus used, as mentioned in their paper.…”

Section: • Melting Temperaturementioning

confidence: 92%

“…The high value obtained by Roget et al [22] may be due to the way that the melting temperature was determined from the DSC curve. Indeed, using the same DSC method and the same heating/cooling rate (2 K min -1 ), Mohammad et al [101] obtained 524.85 K, for the onset point, 529.95 K for the offset point, these temperatures have been determined from deviations from heat flow baselines, and 528.15 K for the melting temperature which seems to be the temperature corresponding to the peak top (temperature corresponding to the end of melting).…”

Section: • Melting Temperaturementioning

confidence: 99%

“…All these values [22,72,101] are considered as unreliable and are disregarded. Thus, 25 of 34 determinations are analyzed statistically.…”

Section: • Melting Temperaturementioning

confidence: 99%

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Thermal behaviour of materials in interrupted phase change

Andrassy

Szánthó

2019

J Therm Anal Calorim

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The most critical part and barrier of phase change material (PCM) applications are the accuracy of simulations and the control of the process. The state of the PCM and the momentarily stored energy cannot be estimated easily unless numerous temperature sensors are used. There are a lot of models used by researchers, but most of them focus solely on the full charging or discharging of the PCM thermal energy storage. In a real working environment, the phase change is often interrupted so this phenomenon should also be modelled with high accuracy. The aim of this paper is to present the newly developed diagonal model validated by differential scanning calorimetry measurements, which can model what occurs inside the hysteresis of the solid-liquid two-phase state. The model was created and validated by using paraffin wax (P53) and was further tested with coconut oil (C.oil20), which has a very wide hysteresis. The modelling accuracy of the different models was compared with each other, and the evaluations were carried out. Keywords Phase change materials (PCM) Á Differential scanning calorimetry (DSC) Á Enthalpy-temperature curves Á Phase transition Á Interrupted melting/solidification List of symbols c Specific heat capacity (kJ kg -1 K -1 ) c app Apparent heat capacity of the PCM during melting (kJ kg -1 K -1 ) f Liquid fraction of PCM (1) H Enthalpy (kJ kg -1 ) L f Latent heat of fusion (kJ kg -1 ) T Temperature (°C)

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Premelting, Melting, and Degradation Properties of Molten Alkali Nitrates: LiNO3, NaNO3, KNO3, and Binary NaNO3-KNO3

Cited by 20 publications

References 90 publications

Understanding the Reaction Chemistry during Charging in Aprotic Lithium–Oxygen Batteries: Existing Problems and Solutions

Understanding the Reaction Chemistry during Charging in Aprotic Lithium–Oxygen Batteries: Existing Problems and Solutions

Experimental investigation and thermodynamic evaluation of the CsNO3-LiNO3-NaNO3 ternary system

Thermal behaviour of materials in interrupted phase change

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