Effects of solvents and salt on the thermal stability of lithiated graphite used in lithium ion battery

Wang, Qingsong; Sun, Jinhua; Chen, Chunhua

doi:10.1016/j.jhazmat.2009.01.125

Cited by 37 publications

(17 citation statements)

References 39 publications

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“…For HCS, it shows successive exothermic process from 180°C to 310°C. There are three exothermic peaks (213°C, 274°C, and 292°C) attributed to thermal reaction and phase transformation to form new Li y C 6 , lithium carbonate, and lithium fluorides [8,27,31]. It can be found that three corresponding processes (stage I, 30-117°C, stage II, 117-228°C, stage III, 228-326°C) appear on TG curve.…”

Section: Resultsmentioning

confidence: 95%

“…They are 104°C, 92°C, and 119°C for HCS, AG, and NG, respectively. Solid electrolyte interphase film, which is generated from electrolyte irreversible decomposition, is always responsible for these initial thermal instabilities [7,[25][26][27][28]. This metastable surface layer is vulnerable to the change of temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, it can exclude the possible signals from chemical decomposition from these pristine materials. Furthermore, based on the previous studies [7,9,26,27], it is known that the thermal reactions of lithium from lithiated carbonaceous material with electrolyte start at 213°C, 215°C, and 207°C for HCS, AG, and NG, respectively. For HCS, it shows successive exothermic process from 180°C to 310°C.…”

Section: Resultsmentioning

confidence: 99%

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Thermal reactivity of three lithiated carbonaceous materials

Shu

Shui

Huang

et al. 2010

Ionics

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The thermal stabilities of hard carbon spherule (HCS), artificial graphite (AG), and natural graphite (NG) were investigated by thermo-gravimetric differential scanning calorimetry (TG-DSC). After lithiation, AG shows the lowest onset exothermic temperature. However, all there materials exhibit similar onset temperatures for thermal reactions after ten cycles. It is obvious that the thermal behaviors of solid electrolyte interphase (SEI) film for HCS and AG change gradually with the electrochemical cycling. In contrast, the thermal stability of the surface film on NG is maintained during repeated lithium ion insertion/extraction. Because of their different Li storage behaviors, their thermal reactivities with electrolyte are quite different from each other. Especially for HCS, it shows several successive and different exothermic peaks at the 1st and 11th lithiated states, while both AG and NG display similar thermal reactivity before and after repeated cycles. In summary, it is found that thermal properties of SEI layer and lithium in lithiated carbonaceous materials for all three samples have different impacts on the whole thermal behaviors of electrode.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Thermal reactivity of three lithiated carbonaceous materials

Shu

Shui

Huang

et al. 2010

Ionics

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“…If this procedure cannot be interrupted without delay, it may develop into thermal runaway or even cause an explosion. Therefore, it is necessary to investigate the thermal stability of the electrolytes, because it is helpful to understand the potential of substances in relatively high temperature applications 33,34 . Figure 3 shows the differential scanning calorimetry (DSC) curves of DPMB and the electrolytes with different concentration of DPMB.…”

Section: Resultsmentioning

confidence: 99%

A novel flame‐retardant electrolyte additive for safer lithium‐ion batteries

et al. 2020

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Summary Lithium‐ion batteries (LIBs) have attracted much attention in the field of new energy. However, due to the flammability of its electrolyte, the batteries may have fire or even explosion accidents in unconventional environment. We have synthesized a new electrolyte additive, 1‐diphenylphosphoryloxy‐4‐methylbenzene (DPMB), in the hope of improving the safety performance of LIBs by combining flame‐retardant and overcharge protection. According to the results of the self‐extinguishing time test and the differential scanning calorimetry test, it can see that the addition of DPMB can improve the flame retardancy of original electrolytes. Unfortunately, the electrochemical test results show that the oxidation potential of DPMB is 3.8 V, which indicate that DPMB cannot achieve the role of overcharge protection. But it is interesting that the addition of DPMB not only has no side effects on the LIBs performance, but also improves the cycle performance and rate capability of the LIBs to a certain extent, especially when the DPMB content is 2wt%. Our results provide a new choice of additives for improving the safety of LIBs electrolyte.

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“…In this approach, the thermal features of the side-reactions between the materials are used to predict and evaluate the thermal behavior of the systems through various models and assumptions [45,46]. While this kind of correlation between the thermal behavior of LIB cell and thermal features of materials was only studied through simulations [17,44] To obtain the thermal performance of charged materials, the materials same as test batteries need to be operated following the same procedure as described in our previous paper [49].…”

Section: Introductionmentioning

confidence: 99%