ELECTROLYTE SOLUTION, ELECTROCHEMICAL DEVICE, SECONDARY BATTERY, AND MODULE

The invention provides an electrolyte solution capable of providing an electrochemical device, such as a lithium secondary battery, or module that has a small IV resistance value (internal resistance) and excellent cycle performance. The electrolyte solution contains a solvent, an electrolyte salt, at least one compound (X) represented by RX-SOM, and at least one organosilicon compound represented by (R)-M-O-SiRRR.