The well-known brands in the mobile power market are mainly lithium-ion polymer batteries. For safety and size reasons, this polymer is used.
Lithium polymer batteries are not yet true polymer batteries. In our industry we generally like to call batteries soft. In fact, they are basically the same as steel-aluminum shell batteries inside, except that their outer packaging is aluminum-plastic film. The electrolyte used in conventional lithium batteries is liquid, while true polymer batteries are semi-solid.
The fundamental reason why lithium-ion polymer batteries are so advanced is that the “solid polymer” replaces the traditional liquid electrolyte.
Advantages of using colloidal or solid polymers instead of liquid organic solvent electrolytes.
First, the poLymer can be made into any shape to fit different equipment. The adaptability is high and the industrial design freedom of the equipment is guaranteed. For example, cell phones (batteries like 18650, which have a fixed shape and use a liquid electrolyte, obviously cannot be used in today's smartphones).
The second is that the electrolyte in the polymer state is safer: the liquid electrolyte will explode in the event of a short circuit and extreme conditions of high temperature and pressure, while the polymer does not will only expand, swell, and then explode. The state will not explode and burn.
The difference between polymer batteries and lithium batteries
The battery type will be marked on the surface of the mobile phone battery, which can be directly observed. Those marked with the words "lithium-ion battery", "lithium polymer battery" and "Li-ion" are lithium batteries, as shown in the figure below:
Nickel-cadmium batteries will be directly marked as "nickel-cadmium battery" or "Ni-Cd", such as shows the picture below:
Most mobile phones on the market currently use lithium batteries, and very few mobile phones use nickel-cadmium batteries.
I think polymer batteries and lithium batteries are two different types of batteries
There are differences in the chemical composition, shape and performance of the batteries. Polymers use polymer materials as positive and negative electrode materials, which can have more flexible shapes and higher energy density. Lithium batteries are generally cylindrical or square and use lithium metal or lithium alloy as material. negative electrode. Polymer batteries have ahigher security and stability.
The appropriate battery type should be selected based on the specific application requirements.