What is the difference between lithium batteries and polymer lithium batteries?lithium ion battery cells 18650

　　1. The fundamental difference is the raw materials, which is the overall root cause of the different manifestations of the two. Polymer batteries refer to the use of polymer materials in at least one of the three major components of the positive electrode, negative electrode, or electrolyte. The meaning of high polymer is high molecular weight, and its corresponding concept is small molecule. High polymer has high strength, high toughness, and high elasticity. The polymer materials currently developed for polymer batteries are mainly used for positive electrodes and electrolytes.

　　① The positive electrode material of polymer batteries can not only use inorganic compounds from lithium batteries, but also conductive polymer materials;

　　② The electrolytes of polymer batteries include polymer electrolytes (solid or colloidal) and organic electrolytes, while lithium batteries use electrolytes (liquid or colloidal)

　　2. In terms of shaping, polymer batteries can achieve thinness, arbitrary area, and arbitrary shape because their electrolytes can be solid or colloidal rather than liquid, while lithium batteries use electrolytes and require a sturdy outer shell as a secondary packaging to accommodate the electrolyte. Therefore, this also adds some weight to the lithium battery.

　　3. In terms of safety: Currently, most polymers are soft pack batteries, using aluminum plastic film as the outer shell. When organic electrolytes are used internally, even if the liquid is very hot, it will not explode because aluminum plastic film polymer batteries are solid or colloidal without leakage, but only naturally rupture. But nothing is absolute. If the instantaneous current is large enough and a short circuit occurs, it is not impossible for the battery to self ignite or burst. The occurrence of safety accidents on mobile phones and tablets is often caused by this situation.

　　4. Cell voltage: Due to the use of polymer materials in polymer batteries, multiple layers of cells can be combined to achieve high voltage, while the nominal capacity of lithium battery cells is 3.6V. To achieve high voltage in practical applications, multiple cells need to be connected in series to form an ideal high voltage working platform.

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