This report discusses the rising market demand for lithium and the land reserves of lithium is going to be depleted by the end of 2080. That’s why there is a need to find some alternative. As rejected brine seawater contains a lot amount of lithium, there is a need to extract that lithium from the seawater. The process description and working of the electrochemical cell are explained in this report. A comparison of different techniques to extract lithium is also provided and the best possible techniques so far are discussed which was practically performed by the King Abdullah University of Science and Technology (KAUST) and some results of this experiment have also been shared.