Why is the anode of Li ion battery made of aluminium foil and negative copper foil?
Therefore, the selection of these two metals mainly takes into account their stability at different potentials.Of course, there are some metals, such as Ti, which can either be positive collector or negative collector. But the cost of Ti is relatively high, it is also difficult to process very thin.
There are many reasons for that.First of all, Al will form lithium aluminum alloy at negative polar potential, that is to say, Al will insert lithium when it is negative. Similarly, Cu in the positive electrode, high potential will be oxidized.
In addition to stability, it is necessary to consider the conductivity of the material, whether it can be machined thin, as well as mechanical strength, cost and other factors. Finally chose Cu and Al.
