Thermal Effect and Mechanism Analysis of Flame-Retardant Modified Polymer Electrolyte for Lithium-Ion Battery

Abstract

In recent years, the prosperous electric vehicle industry has contributed to the rapid development of lithium-ion batteries. However, the increase in the energy density of lithium-ion batteries has also created more pressing safety concerns. The emergence of a new flame-retardant material with the additive ethoxy (pentafluoro) cyclotriphosphazene can ameliorate the performance of lithium-ion batteries while ensuring their safety. The present study proposes a new polymer composite flame-retardant electrolyte and adopts differential scanning calorimetry (DSC) and accelerating rate calorimetry to investigate its thermal effect. The study found that the heating rate is positively correlated with the onset temperature, peak temperature, and endset temperature of the endothermic peak. The flame-retardant modified polymer electrolyte for new lithium-ion batteries has better thermal stability than traditional lithium-ion battery electrolytes. Three non-isothermal methods (Kissinger; Kissinger–Akahira–Sunose; and Flynn–Wall–Ozawa) were also used to calculate the kinetic parameters based on the DSC experimental data. The apparent activation energy results of the three non-isothermal methods were averaged as 54.16 kJ/mol. The research results can provide valuable references for the selection and preparation of flame-retardant additives in lithium-ion batteries.

Simulation Investigation on Thermal Characteristics of Thermal Battery Activation Process Based on COMSOL

“…The highest temperature of the cathode is 525 • C. The temperature curves of the cathode and the electrolyte sheet fluctuate slightly during the heating process, showing that a certain proportion of the electrolyte phase change material is added to the cathode, and a part of the heat is absorbed during the electrolyte melting process. Due to the working mechanism and fast-activation requirements of thermal batteries, the temperature of electrolytes rises faster than the as reported Li-ion battery electrolytes [23,24]. Based on it, the curves have a small fluctuation, which is in line with the actual situation.…”

Thermal hazard evaluation on spontaneous combustion characteristics of nitrocellulose solution under different atmospheric conditions

“…Taking the natural logarithm of both sides of the equation above, Kissinger model can be obtained and presented in the following Eq. ( 9 ) 37 , 46 : …”

“…An integral kinetic model named FWO model was devised, and the formula is presented in Eq. ( 11 ) 48 , 49 : where G ( α ) is the integral form to the kinetic mechanism function 46 .…”

ARGET-ATRP-Mediated Grafting of Bifunctional Polymers onto Silica Nanoparticles Fillers for Boosting the Performance of High-Capacity All-Solid-State Lithium–Sulfur Batteries with Polymer Solid Electrolytes

“…The development of all-solid-state Li-S batteries holds tremendous potential for the commercialization of Li-S battery technology [ 16 , 17 , 18 , 19 , 20 ]. Solid polymer electrolytes (SPEs) can play a crucial role by acting as physical barriers, effectively controlling the dissolution of LiPSs from the cathode and mitigating their negative impact on the anode [ 18 , 21 , 22 , 23 , 24 ]. Additionally, SPEs offer a range of advantages, such as preventing electrolyte leakage, enabling high energy density, and enhancing safety [ 24 , 25 , 26 ].…”

“…Solid polymer electrolytes (SPEs) can play a crucial role by acting as physical barriers, effectively controlling the dissolution of LiPSs from the cathode and mitigating their negative impact on the anode [ 18 , 21 , 22 , 23 , 24 ]. Additionally, SPEs offer a range of advantages, such as preventing electrolyte leakage, enabling high energy density, and enhancing safety [ 24 , 25 , 26 ]. In the realm of SPEs, blends of high molecular weight polyethylene oxide (PEO) and its derivatives with lithium salts have gained considerable attention [ 27 , 28 , 29 , 30 , 31 ].…”