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Developing And Investigating A Fast And Controllable Prelithiation Method For Lithium-Ion Batteries, Huainan Qu
Developing And Investigating A Fast And Controllable Prelithiation Method For Lithium-Ion Batteries, Huainan Qu
Theses and Dissertations
Prelithiation is to pre-load Li ions in a Li-ion electrode prior to a formation cycle. A chemical, roll-to-roll prelithiation method was developed in this thesis research. The method can be applied to different anode materials. The prelithiation compensated the initial loss of lithium during the formation cycles of a lithium-ion battery (LIB). Eventually, the initial coulombic efficiency (ICE) was significantly increased. In addition, the cyclability of a prelithiated battery was highly related to the quality of the solid electrolyte interface (SEI) on the anode surface. Electrochemical impedance spectroscopy (EIS) was a major technique to evaluate the difference of the SEI …
Ac-Impedance Investigations Of Li-Ion Batteries With Wide Temperature Performance, Huainan Qu
Ac-Impedance Investigations Of Li-Ion Batteries With Wide Temperature Performance, Huainan Qu
Theses and Dissertations
Solid electrolyte interphase (SEI) of lithium-ion batteries in three electrode pouch cells was studied by using electrochemical impedance spectroscopy (EIS). Two kinds of electrolytes were used for the comparison purpose. Electrochemical impedance of individual electrodes and the full cell was measured in various state of aging, charge and temperature conditions. The equivalent circuit was identified through distribution of relaxation times (DRT), and then used to fit the impedance data. The results show that majority of the full cell impedance at -20℃ arises from anode SEI.