Q. S. Wang, L. H. Feng and J. H. Sun (2016) A Multi-Component Additive to Improve the Thermal Stability of Li(Ni1/3Co1/3Mn1/3)O-2-Based Lithium Ion Batteries. Journal/Energies 9 10. [In English]
Web link: http://dx.doi.org/10.3390/en9060424
Keywords: ,lithium ion battery (LIB) safety, multi-component (MC) additive, thermal, stability, electrolyte, COBALT MANGANESE OXIDE, PHENYL DIPHENYL PHOSPHATE, ELECTROLYTE, ADDITIVES, CATHODE MATERIALS, ELECTROCHEMICAL PERFORMANCE, NONFLAMMABLE, ELECTROLYTE, METHYLPHOSPHONATE, CALORIMETER, LI4TI5O12, ANODES

Abstract: To improve the safety of lithium ion batteries, a multi-component (MC) additive (consisting of vinylene carbonate (VC), 1,3-propylene sulfite (PS) and dimethylacetamide (DMAC)) is used in the baseline electrolyte (1.0 M LiPF6/ethylene carbonate (EC) + diethyl carbonate (DEC)). The electrolyte with the MC additive is named safety electrolyte. The thermal stabilities of fully charged Li(Ni1/3Co1/3Mn1/3)O-2 (NCM) mixed with the baseline electrolyte and safety electrolyte, respectively, are investigated using a C80 micro-calorimeter. The electrochemical performances of the NCM/baseline electrolyte/Li and NCM/safety electrolyte/Li half cells are evaluated using galvanostatic charge/discharge, cyclic voltammetry and alternating current (AC) impedance. The experimental results demonstrate that the fully charged NCM-safety electrolyte system releases less heat and reduces the main sharp exothermic peak value to a great extent, with a reduction of 40.6%. Moreover, the electrochemical performances of NCM/safety electrolyte/Li half cells are not worse, and are almost as good as that of the NCM/baseline electrolyte/Li half cells.