Thermodynamic and Kinetic Study on Lithium Bis(Oxalato)Borate Thermal Decomposition Reaction

摘要

Reported accidents such as fire and explosion on account of lithium-ion batteries remind us it is important to understand the thermal stability of battery materials. Lithium salt plays an important role in the safety of lithium ion batteries. Thermal decomposition reaction of a lithium salt-lithium bis(oxalato)borate (LiBOB) was studied using C80 calorimeter under argon atmosphere. The samples were heated at a 0.2 K min~(-1) heating rate from ambient temperature to 573 K in single scanning rate experiments, or at different constant temperatures (528 K, 533 K, 538 K, 543 K) in isothermal experiments. The results show that LiBOB decomposes near 433 K, and its decomposition reaction order was calculated to be n=1.43. In addition, thermodynamic parameters and kinetic parameters were obtained. The reaction heat associated with LiBOB decomposition process is 197.33 J g~(-1), the activation energy and pre-exponential factor were calculated to be E=177.23 kJ mol~(-1) and A=6.51×106 s~(-1), respectively.