Lithium phosphorus oxynitride (LiPON) has been widely used as the solid-state electrolyte for all-solid-state thin-film battery (ASSTFB) since firstly synthesized in 1992 due to its outstanding electrochemical and mechanical properties. This review summarizes the research and progress in ASSTFBs based on LiPON. Various LiPON-derivatives with adjustable chemical compositions of the amorphous structure have been developed to improve the ionic conductivity and electrochemical stability, they are detailed in this review. The investigations on the interface between LiPON/electrodes to perfect the overall properties of ASSTFBs are summarized. All kinds of physical and chemical preparation methods for LiPON with different characteristics are also described.
A transformative concept of solid electrochemical corrosion has been put forward, in which solid-state electrolyte LiPON has been applied to replace the liquid one to prelithiate graphite with Li-metal. Thus,...
The improvement of the interface between a lithium metal and a solid electrolyte layer is very important for the application of a lithium anode coated by solid electrolytes in lithium metal batteries. In order to address the issues of interface performance and compatibility between solid electrolyte films prepared by magnetron sputtering and lithium metals and the suppression of lithium dendrite during the cycling, a three-layer interface solid electrolyte film based on carbon-doped lithium phosphate oxynitride (LiCPON) was employed for coating a lithium metal. The sandwich structure of LiCPON by introducing an ultra-thin lithium niobium oxynitride (LiNbON) layer prepared by sputtering LiNbO3 in nitrogen ambient can be confirmed by time-of-flight secondary ion mass spectrometry. Atomic force microscopy data indicated that the surface of the LiCPON thin film with the sandwich structure is flatter and smoother than that of the LiCPON thin film on the lithium metal. The interface impedance of the symmetric battery based on the sandwich structure of the LiCPON coating lithium metal was reduced from 512.2 to 65.4 Ω, and the symmetric battery stable cycles from 300 h with an overpotential of more than 200 mV to 400 h with low overpotential of about 77 mV. These results suggest that functional multilayer solid electrolyte films become an effective method for protecting lithium. The incorporation of ultra-thin LiNbON into the LiCPON thin film could significantly decrease interface impedance between the lithium metal and solid electrolyte layer.
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