Lithium is the lightest metal element in nature. By using lithium as the negative electrode and matching it with an appropriate positive electrode, an energy to mass ratio of up to 380W · h/kg to 450W · h/kg can be obtained.

　　Batteries with lithium as the negative electrode are called lithium batteries. As a trial battery, one is a lithium battery with Lithium perchlorate as electrolyte and carbon polyfluoride as cathode material, and the other is a lithium battery with Lithium bromide as electrolyte and sulfur dioxide as cathode material.

　　The main advantages of lithium batteries are that they can release a large amount of electrical energy (much larger than the energy of zinc silver batteries) in a small volume or self weight. The voltage during discharge is very stable, the storage life is long, and they can work effectively over a wide temperature range. The application is the same as that of zinc silver batteries. From the perspective of development trends, the competitiveness of lithium batteries will surpass that of zinc silver batteries.

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