Using a Boron-Based Anion Receptor Additive to Improve the Thermal Stability of LiPF[sub 6]-Based Electrolyte for Lithium Batteries

Sun, Xiaoming; Lee, H. S.; Yang, Xiao Qing; McBreen, J.

doi:10.1149/1.1510321

Cited by 96 publications

(70 citation statements)

References 8 publications

(14 reference statements)

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“…The most representative anion receptor is probably TPFPB (Figure 6, right-hand side), in which boron is extremelye lectron deficientd ue to the surrounding highly electron-withdrawing perfluorinated phenyl groups.I tw as demonstrated that the addition of ac ertain amount of TPFPB could significantly improve the electrochemical performance of LIBs [121] and the thermals tability of LiPF 6 -based electrolytes. [133,134] Nevertheless, it should be considered that an excess of TPFPB may have an egative impact on the thermals tability of the electrolyte for two reasons: 1) extensive depletion of the inorganic SEI components, such as LiF,p resumably resultsi navery thin and inhomogeneous SEI layer; and 2) extensive "scavenging" of fluorine anionsm ay favor the formation of the strong Lewis acid PF 5 by shifting the equilibrium in Equation (1) towards the right. As-generated PF 5 may then inducea ccelerated decomposition of the SEI through an acid-base reactionw ith the SEI components and degradation of the electrolyte.…”

Section: Sei Supporting Additivesmentioning

confidence: 99%

Safer Electrolytes for Lithium‐Ion Batteries: State of the Art and Perspectives

et al. 2015

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Lithium-ion batteries are becoming increasingly important for electrifying the modern transportation system and, thus, hold the promise to enable sustainable mobility in the future. However, their large-scale application is hindered by severe safety concerns when the cells are exposed to mechanical, thermal, or electrical abuse conditions. These safety issues are intrinsically related to their superior energy density, combined with the (present) utilization of highly volatile and flammable organic-solvent-based electrolytes. Herein, state-of-the-art electrolyte systems and potential alternatives are briefly surveyed, with a particular focus on their (inherent) safety characteristics. The challenges, which so far prevent the widespread replacement of organic carbonate-based electrolytes with LiPF6 as the conducting salt, are also reviewed herein. Starting from rather "facile" electrolyte modifications by (partially) replacing the organic solvent or lithium salt and/or the addition of functional electrolyte additives, conceptually new electrolyte systems, including ionic liquids, solvent-free, and/or gelled polymer-based electrolytes, as well as solid-state electrolytes, are also considered. Indeed, the opportunities for designing new electrolytes appear to be almost infinite, which certainly complicates strict classification of such systems and a fundamental understanding of their properties. Nevertheless, these innumerable opportunities also provide a great chance of developing highly functionalized, new electrolyte systems, which may overcome the afore-mentioned safety concerns, while also offering enhanced mechanical, thermal, physicochemical, and electrochemical performance.

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Section: Sei Supporting Additivesmentioning

confidence: 99%

Safer Electrolytes for Lithium‐Ion Batteries: State of the Art and Perspectives

et al. 2015

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“…The electrolyte solution with lithium hexafluorophosphate (LiPF 6 ), which the current lithium-ion industry uses exclusively, shows thermal instability. Recently, Herstedt and McBreen et al reported that tris(pentafluorophenyl) borate (TPFPB) as an anion receptor improved the thermal stability of lithium ion cells containing LiPF 6 -based electrolyte solution [9][10][11]. It is believed that this behavior is obviously linked to Lewis acid-base interaction between boron atoms of TPFPB anion receptor and PF 6 − anions.…”

Section: Introductionmentioning

confidence: 99%

Effect of tris(methoxy diethylene glycol) borate on ionic conductivity and electrochemical stability of ethylene carbonate-based electrolyte

Choi

Ryu

Park

2008

Electrochimica Acta

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“…For the SEI formed with LiPF 6 -carbonate electrolyte, isolated LiF is the important factor producing unstable SEI [87]. For this reason, many boron-based anion receptors have been developed to dissolve LiF [88].…”

Section: Safety Concerns With LI Saltsmentioning

confidence: 99%

Electrolytes and Separators for Lithium Batteries

et al. 2016

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Rechargeable lithium batteries are basically of two types; lithium metal batteries, and, lithium-ion batteries. Lithium metal batteries (LMB) provide a higher theoretical energy density than the alternatives: their wide commercial availability is limited, however, by the tendency to grow dendrites during cycling. This is a potential hazard and also reduces cycle lifetime. Attempts are being made to suppress dendritic growth either by using solid electrolytes that act as mechanical barriers, or by choosing electrolytes that produce a suitable passivation layer called the solid-electrolyte interphase (SEI). Since there is no entirely successful strategy to inhibit the growth of dendrites, safety concerns have led to the use of the other kind of lithium battery, namely, the lithium-ion battery (LiB).Lithium-ion batteries are now widely employed for a variety of applications in electronic devices, mobile telephones, laptop computers and a large variety of other portable appliances. They possess a very high energy density, are light and compact and show excellent cyclability and reliability. The current commercial Li-ion batteries are based on aprotic organic liquids such as ethylene carbonate or dimethyl carbonate which have high dielectric constant and are thus good solvents for salts; they also show a large window of electrochemical stability. However, their vapor pressure is high, so that they can provoke fires and explosions in case of accidental battery shorts, when low-stability cathodes are used such as oxides. Such safety issues become accentuated in large lithium-ion batteries of interest in electric cars, especially if charge-discharge is carried out at high rates. The safety aspect has thus become a paramount issue in the development of this technology. Another component important for safety issue is the separator. This element must have, among other properties, a good wettability with the electrolyte, so that the choice of the separator is dependent on the choice of the electrolyte, one reason why we have chosen to include them in the same chapter.

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Using a Boron-Based Anion Receptor Additive to Improve the Thermal Stability of LiPF[sub 6]-Based Electrolyte for Lithium Batteries

Cited by 96 publications

References 8 publications

Safer Electrolytes for Lithium‐Ion Batteries: State of the Art and Perspectives

Safer Electrolytes for Lithium‐Ion Batteries: State of the Art and Perspectives

Effect of tris(methoxy diethylene glycol) borate on ionic conductivity and electrochemical stability of ethylene carbonate-based electrolyte

Electrolytes and Separators for Lithium Batteries

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