Development of Electrolytes for Single Crystal NMC532/Artificial Graphite Cells with Long Lifetime

作者：Li Jing; Li Hongyang; Stone Will; Glazier Stephen; Dahn J R^*

来源：Journal of the Electrochemical Society, 2018, 165(3): A626-A635.

DOI：10.1149/2.0971803jes

NMC532/artificial graphite cells using single crystal NMC532 active material can have excellent long term lifetime at 4.4 V and elevated temperature if appropriate electrolytes are used. However, electrolytes developed earlier for these cells and reported in the literature cannot support even C/2 rates during charging without unwanted lithium plating at room temperature. This work is thus focused on the development of new electrolytes for single crystal NMC532/artificial graphite cells that can yield long lifetime and support higher charging rates. Ex-situ and in-situ gas measurements, ultra-high precision coulometry, isothermal microcalorimetry, lithium plating tests and long term cycling tests were used for the screening of electrolytes. Electrolytes with 2% vinylene carbonate (VC) + 1% ethylene sulfate (DTD) additives or 2% fluoroethylene carbonate (FEC) + 1% DTD additives yield single-crystal NMC532/graphite cells with long lifetime that can support C-rate charging at 20 degrees C.

• 出版日期2018