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Nickel hydrogen uses the same or similar electrolyte as nickel cadmium, usually potassium hydroxide. Nickel hydrogen electrodes are unique and consist of nickel, cobalt, manganese, aluminum, and rare earth metals, which are also used for lithium ions. Nickel hydrogen only has a sealed version.
Potassium hydroxide is an inorganic compound with the general formula KOH, commonly known as caustic potassium. Electrolytes are colorless and have many industrial applications, such as the composition of most soft soaps and liquid soaps.
Lithium ion batteries
Lithium ion batteries use liquid, gel or dry polymer electrolyte. The liquid form is a flammable organic form, rather than an aqueous form, which is a solution formed by lithium salts and organic solvents similar to ethyl carbonate. Mixing the solution with various carbonates can provide higher conductivity and expand the temperature range. Other salts can be added to reduce bleeding and improve high-temperature cycling.
Lithium ions with gelled electrolytes receive many additives to increase conductivity, and so do lithium polymer batteries. True dry polymers only have conductivity at high temperatures, and this battery is no longer used for commercial purposes. Additives have also been added to achieve longevity and unique characteristics. Recipes are classified, and each manufacturer has their own secret recipe.
The electrolyte should be stable, but lithium ions are not in this situation. The passivation film forms on the anode, known as the Solid Electrolyte Interface (SEI). This layer separates the anode from the cathode, but allows ions to pass through like separators. Essentially, an SEI layer must be formed for the battery to function properly. Thin films can stabilize the system and extend the lifespan of lithium-ion batteries, but this can lead to a decrease in capacity. Electrolyte oxidation also occurs at the cathode, permanently reducing capacity.
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