Shiga, Tohru; Masuoka, Yumi; Nozaki, Hiroshi published their research in RSC Advances in 2021. The article was titled 《Observation of lithium stripping in super-concentrated electrolyte at potentials lower than regular Li stripping》.Recommanded Product: 872-36-6 The article contains the following contents:
Lithium plating/stripping was investigated under constant current mode using a copper powder electrode in a super-concentrated electrolyte of lithium bis(fluorosulfonyl)amide (LiFSA) with methylphenylamino-di(trifluoroethyl) phosphate (PNMePh) and vinylene carbonate (VC) as additives. Typical Li plating/stripping for Cu electrodes in organic electrolytes of conventional lithium batteries proceeds at potentials of several millivolts vs. a Li counter electrode. In contrast, a large overpotential of hundreds of millivolts was observed for Li plating/stripping with the super-concentrated electrolyte. When Li stripping started immediately after Li plating and with no rest time between plating and stripping, two potential plateaus, i.e., two-step Li stripping, was observed The potential plateau for the 1st stripping step appeared at -0.2 V vs. a Li metal counter electrode. The elec. capacity for the 1st stripping step was 0.04 mA h cm-2, which indicates irregular Li stripping. Two-step Li stripping was also recorded using cyclic voltammetry. The electrochem. impedance spectroscopy (EIS) studies indicated that the two-step Li stripping behavior reflected two different solid electrolyte interphases (SEIs) on electrodeposited Li in a Cu electrode. The SEI for the 1st-step stripping was in a transition period of the SEI formation. The open circuit voltage (OCV) relaxation with an order of tens of hours was detected after Li plating and before Li stripping. The in operando EIS study suggested a decrease of the charge transfer resistance in the Cu powder electrode during the OCV relaxation. Since the capacitance for the voltage relaxation was a dozen microfarads, it had a slight contribution to the 1st-step Li stripping behavior. The voltage relaxation indicated the possibility that it is difficult for Li ions to be electrodeposited or that the Li plating is in a quasi-stable state. The results came from multiple reactions, including the reaction of Vinylene carbonate(cas: 872-36-6Recommanded Product: 872-36-6)
Vinylene carbonate(cas: 872-36-6) belongs to esters. Alkyl carbonates find applications as solvents for lithium ion battery electrolytes and the use of high quality battery grade electrolytes having extremely low water (<10 ppm) and acid (<10 ppm) contents are critical for achieving high electrochemical performance.Recommanded Product: 872-36-6
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics