Influence of salt, solvents, and additives on the thermal stability of delithiated cathodes in lithium-ion batteries

The thermal stability of a fully delithiated cathode, coupled with an inorganic salt, organic solvents, and electrolyte, was evaluated with differential scanning calorimetry (DSC) to address the safety issue of lithium-ion batteries. The DSC experiments revealed that vinylene carbonate (VC)-based sy...

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Published inJournal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 807; pp. 174 - 180
Main Authors Lee, Yongho, Kim, Sang-Ok, Mun, Junyoung, Park, Min-Sik, Kim, Ki Jae, Lee, Kwan Young, Choi, Wonchang
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.12.2017
Elsevier Science Ltd
Subjects
Additives
Batteries
Cathode
Cathodes
Differential scanning calorimetry
Electrochemical analysis
Electrodes
Heat conductivity
Inorganic salts
Lithium-ion batteries
Lithium-ion battery
Rechargeable batteries
Safety
Salt
Solvents
Stability analysis
Thermal stability
Thermodynamic properties
Lithium-ion battery
Solvents
Additives
EVs
DEC
Cathode
VC
LIBs
Thermal stability
GBL
PC
DSC
SEI
EMC
HEVs
DMC
PEO
EC
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Summary:The thermal stability of a fully delithiated cathode, coupled with an inorganic salt, organic solvents, and electrolyte, was evaluated with differential scanning calorimetry (DSC) to address the safety issue of lithium-ion batteries. The DSC experiments revealed that vinylene carbonate (VC)-based systems exhibit decreased thermal stability compared to other coexisting systems. The DSC analysis of the cathode and electrolyte in the presence of VC, employed as additives, confirmed the reduction in thermal stability. Our results suggested that VC additives, which have been recently employed to enhance the electrochemical performance in anodes, negatively affect the thermal properties and safety characteristics of the cathode in lithium-ion batteries. [Display omitted] •Studied thermal stability of delithiated cathodes and electrolyte components by using DSC•This study helps address the issue of safety of lithium-ion batteries.•VC additives are previously known to enhance the performance of the anode.•Therefore, systems based on VC additive show a decreased thermal stability.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2017.11.046