A Multi-Component Additive to Improve the Thermal Stability of Li(Ni 1/3 Co 1/3 Mn 1/3 )O 2 -Based Lithium Ion Batteries

Qingsong Wang, Lihua Feng and Jinhua Sun
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Qingsong Wang: State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China
Lihua Feng: State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China
Jinhua Sun: State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China

Energies, 2016, vol. 9, issue 6, 1-10

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 LiPF 6 /ethylene carbonate (EC) + diethyl carbonate (DEC)). The electrolyte with the MC additive is named safety electrolyte. The thermal stabilities of fully charged Li(Ni 1/3 Co 1/3 Mn 1/3 )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.

Keywords: lithium ion battery (LIB) safety; multi-component (MC) additive; thermal stability; electrolyte (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
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