Lithium Ion/Polymer - Developments in the lithium ion/polymer battery have been mostly focused on the cathode. Conventional lithium cells use lithium cobalt oxide, however, in the recent past lithium nickel manganese cobalt oxide, coated lithium cobalt, mixtures of different lithium cathodes, lithium iron phosphate have been introduced in the consumer market. Most new cathodes offer higher safety and/or performance options which have negatively affected the lithium ion/polymer legacy. The lithium based cell technology has been taking over the use of alternative chemistries.
NiMH - The nickel metal hydride cell uses nickel oxyhydroxide as the cathode material while a hydrogen absorbing metal alloy is used as the anode. Although this chemistry has been around for many decades, there has been some significant recent advancements in the overall capacity and especially charge retention of these cells. This type of cell has predominantly replaced the nickel cadmium cell for various reasons including but not limited to its higher energy density and better  environmental friendliness.
Alkaline - The alkaline cell is based on the reactions occurring at a zinc anode and a manganese oxide cathode. The alkali electrolyte is typically potassium hydroxide impregnating a relatively simple separator as well as the anode and cathode matrices. These cells are commonly used and readily available throughout the world. Leakage over time is one of the most common issues with these cells.


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