On the thermal stability of LiPF6

Ion dynamics in halogen-free phosphonium bis(salicylato)borate ionic liquid electrolytes for lithium-ion batteries

“…For example, the most common conventional electrolyte used in the commercially available lithium-ion batteries is the LiPF 6 salt dissolved in a mixture of ethylene carbonate (EC) and diethyl carbonate (DEC). 3,4 LiPF 6 is thermally unstable and decomposes at elevated temperatures, producing LiF and PF 5 . PF 5 is proven to undergo hydrolysis, forming HF and PF 3 O that are highly reactive to both positive and negative electrodes.…”

“…PF 5 is proven to undergo hydrolysis, forming HF and PF 3 O that are highly reactive to both positive and negative electrodes. 5 Extensive research efforts are being made to develop novel and safe electrolytes for lithium-ion batteries to improve the safety of the energy storage devices. Ionic liquids possess a combination of properties that makes them excellent electrolytes for batteries in terms of enhanced performance, safety, and stability.…”

Enhancement of Thermal Stability and Cycling Performance of Lithium-Ion Battery at High Temperature by Nano-ppy/OMMT-Coated Separator

“…That can be explained by the loss of LiPF 6 in negative reactions between the positive electrode and organic electrolyte at high temperature [24,33]. It is well known that HF is generated by thermal decomposition and hydrolysis of LiPF 6 by trace moisture in the electrolyte solution in (4) [5,8] (5). The result leads to the increase of the internal resistance and the decrease of discharge capacity at 80 ∘ C, as Hunter and Inoue reported [34,35].…”

“…LiF, HF, and POF 3 from the thermal decomposition and hydrolysis of LiPF 6 at high temperature may be formed on the surface of the electrodes [5]. As insulating materials, LiF and POF 3 may hinder the charge transfer reaction [6,7]; HF can corrode the transition metals of cathode material [5,8]. Hence, the electrochemical property and stability of LIB at high temperature depend on the thermal stability of organic electrolyte and separator.…”

Electrical Conductivity, Viscosity and Thermal Properties of TEGDME-Based Composite Electrolytes for Lithium-Air Batteries

“…• C could be attributed to melting of Li salts (LiF) [14]. To determine thermal stabilities of the electrolytes TG tests were carried out and the results are illustrated in Fig.…”