Lithium Ion vs. Lithium Polymer: What's the Difference?

2015/05/15 | Source: ANDROID AUTHORITY

Did you ever think about why your phone works at all? Probably not. But, if you think about it, all portable gadgets rely on a battery to keep ticking – and some have better battery life than others. That's why we're going to take a peek at what keeps your phone ticking and why some batteries do better than others.

Lithium Polymer Battery

Lithium-polymer batteries can be dated back to the 1970's. Their first design included a dry solid polymer electrolyte that resembled a plastic film. Therefore, this type of battery can result in credit card thin designs while still holding relatively good battery life. In addition, lithium-polymer batteries are very lightweight and have improved safety. However, these batteries will cost more to manufacture and have a worse energy density than lithium-ion batteries.

•Lithium polymer chemistry differentiates itself from Lithium Ion in the type of electrolyte used (a plastic-like film that does not conduct electricity but allows ion exchange - electrically charged atoms or groups of atoms).

•The polymer electrolyte replaces the traditional porous separator, which is soaked with electrolyte.

•The dry polymer design offers simplifications with respect to fabrication, ruggedness, safety and thin-profile geometry.

•Cell thickness measures as little as one millimeter (0.039 inches).

•Can be formed and shaped in any way imagined.

•Commercial lithium polymer batteries are hybrid cells that contain gelled electrolyte to enhance conductivity.

•Gelled electrolyte added to the lithium ion polymer replaces the porous separator. The gelled electrolyte is simply added to enhance ion conductivity.

•Improved safety - more resistant to overcharge; less chance for electrolyte leakage.

Lithium-ion Battery

Lithium Ion Batteries have high energy-densities and cost less than lithium-polymer batteries. In addition, they do not require priming when first used and have a low self-discharge. However, lithium-ion batteries do suffer from aging – even when not in use.

•The lightest of all metals

•The load characteristics are reasonably good in terms of discharge.

•The high cell voltage of 3.6 volts allows battery pack designs with only one cell versus three.

•It is is a low maintenance battery.

•No memory and no scheduled cycling is required to prolong the battery's life.

•Lithium-ion cells cause little harm when disposed.

•It is fragile and requires a protection circuit to maintain safe operation.

•Cell temperature is monitored to prevent temperature extremes.

•Capacity deterioration is noticeable after one year (whether the battery is in use or not).

From the above-mentioned text, you can obviously learn that the lithium-polymer battery is sleeker and thinner, and more safe to use. Lithium-ion batteries suffer from aging - even when not in use. The battery life of lithium-polymer is longer than lithium-ion battery.

Therefore, lithium-polymer battery is chosen by us. ZOPO's Speed series, Flash series and Color series smartphones all utilize lithium-polymer battery to ensure safety and quality of our products.

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