Polymer batteries are better, and lithium batteries are almost eliminated now. Lithium batteries use metallic lithium as the negative electrode. The earliest lithium-manganese battery, the reaction mode is redox reaction Li+MnO2 = LiMn02. The voltage of lithium metal battery is about 3.0~3.6, depending on the cathode material. At present, lithium metal batteries are mainly used in button cell, and others have been replaced by lithium polymer batteries or lithium ion batteries. Because lithium is a more active metal than sodium, it is easy to lose the battery, that is, it is easy to have oxidation reaction. Needless to say, even hydrogen in water can be replaced, and lithium batteries react almost as soon as they meet air. In the past, it was often seen that the lithium battery was used to make a fire in the wild, that is, the battery was smashed, and the lithium inside reacted with air to release huge heat, which showed how dangerous the lithium battery was. Unlike lithium batteries, lithium-ion batteries do not contain metallic lithium.
Lithium-ion battery is a rechargeable battery, which mainly depends on the movement of lithium ion between the positive electrode and the negative electrode. In the process of charging and discharging, li+
Insertion and extraction between the two electrodes: when the battery is charged, li+ is extracted from the positive electrode and inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; The opposite is true when discharging.
Polymer battery is actually a kind of lithium-ion battery, and its principle is the same as that of lithium-ion battery. Different from lithium-ion batteries, the electrolyte inside is replaced by electrolyte, so it is safer and smaller.