A lithium battery is a battery that uses lithium metal or lithium alloy as the cathode material and uses a non-aqueous electrolyte solution. Lithium metal batteries were first proposed and studied by Gilbert N. Lewis in 1912. In the 1970s, Ms. S. Whittingham proposed and began to research lithium-ion batteries. Because lithium metal has very active chemical properties, the processing, storage and use of lithium metal have high environmental requirements. As a result, lithium batteries have not been used for a long time. With the development of science and technology, the lithium battery has become the mainstream. Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Lithium-ion batteries do not contain lithium metal and are rechargeable. The fifth generation of rechargeable battery, lithium metal battery, was born in 1996. Its safety, specific capacity, self-discharge rate, performance and price ratio are better than lithium ion battery.