Why is our battery technology stagnant?

From the popularity of lithium batteries to now almost thirty years to it, honestly, this thirty years battery technology is basically on the same place from dry cell, to lead storage batteries, and then to today's lithium batteries, although the emerging batteries can come out of the endless, carbon fiber batteries, hydrogen-oxygen fuel cells and so on can not replace the lithium batteries, which is the cell phone can not be done more and more small, electric cars can not eliminate the fuel from the car's main reason. The higher the energy storage capacity of the battery explosion is more powerful. Emerging high-capacity long range small volume battery has not been able to solve the cost, safety and a series of problems, most of these problems are material issues, research and development of emerging materials was sometimes like you scratch the lottery, the chance is more powerful, so there is no way to replace the lithium battery in a short period of time.