Final answer:
The lithium-iodine battery is a type of battery that contains no free or liquid electrolyte. It uses lithium metal as the anode and a solid complex of I2 as the cathode. The electrolyte is a layer of solid LiI, which allows the diffusion of Li* ions.
Step-by-step explanation:
A type of battery that contains no free or liquid electrolyte is the lithium-iodine battery. This battery is considered to be water-free because it contains only small amounts of liquid water, which adds mass and can cause corrosion issues. The anode of the battery is made of lithium metal, while the cathode is a solid complex of I2. These two components are separated by a layer of solid LiI, which acts as the electrolyte by allowing the diffusion of Li* ions.
The lithium-iodine battery is highly reliable and long-lived, although it produces a relatively small current. It is commonly used in applications where size and longevity are crucial, such as in medical devices or implantable devices.