Lithium-ion batteries(LIBs) are considered the most effective power source for various applications such as mobile electronics, electric vehicles and energy storage systems due to their favorable energy density and long cycle life. However, liquid electrolyte currently used in LIBs has critical drawbacks such as flammability and leakage problem. To make a breakthrough of these problems, intensive efforts have been devoted to replace liquid electrolyte to safer electrolytes. Among various electrolyte systems, the chemically cross-linked gel polymer electrolytes can enhance the thermal safety of LIBs by encapsulating organic solvent in the polymer matrix. However, they usually contain a large amount of organic solvents to achieve high ionic conductivity, and side reactions may occur during the cross-linking reaction. However, they usually contain a large amount of organic solvents to achieve high ionic conductivity, and side reactions may occur during the cross-linking reaction, causing cell degradation due to impurities affecting electrochemical performance. In this work, we report the synthesis and electrochemical characteristics of quasi-solid-state electrolytes using thiol-ene click chemistry. During cell assembly, the cathode was coated with electrolyte precursor and thermally cured using thiol-ene click chemistry, since the click reaction can avoid side reactions and drive fast cross-linking under mild reaction conditions. The obtained cathode with quasi-solid-state electrolyte was applied to the lithium-ion cell composed of graphite anode and LiNi0.6Co0.2Mn0.2O2 cathode, and their electrochemical performance was investigated. Our result demonstrates that the quasi-solid-state polymer electrolyte can be a promising electrolyte for achieving high performance and enhancing battery safety.