With the 3.15 exposure of mobile phone battery problems, mobile phone batteries have become an insecure factor in life. How to prevent problems before they occur and prevent the occurrence of security incidents. The following small series will explain to you how safe the mobile phone battery is. Learn more about the mobile phone battery we use.
One: Lithium-ion battery, or lithium-ion polymer battery?
The mobile phone batteries currently on the market are mainly lithium-ion batteries and lithium-ion polymer batteries. Lithium-ion polymer batteries are currently safer than lithium-ion batteries but are also more expensive.
The positive and negative materials used in the polymer lithium ion battery are the same as the liquid lithium ions. The positive electrode material is divided into lithium cobaltate, lithium manganate, ternary material and lithium iron phosphate material, and the negative electrode is graphite. The working principle of the battery is also basically Consistent. The main difference between them is the difference in electrolytes. Liquid lithium-ion batteries use liquid electrolytes, while polymer lithium-ion batteries are replaced by solid polymer electrolytes.
The chemical properties of lithium are very active and easy to burn. When the battery is charged and discharged, the inside of the battery continues to heat up. The gas generated during the activation process expands, the internal pressure of the battery increases, and the pressure reaches a certain level. If the outer casing is scratched, it will rupture. Causes leakage, fire, or even explosion. The polymer lithium ion battery is safer because it uses a solid electrolyte, does not leak and explode, and only expands.
Many of the unsatisfactory mobile phone batteries of the Zhejiang Industrial and Commercial Bureau are due to the relatively cheap lithium-ion battery, such as the famous Lenovo A790e. The BL194 mobile phone battery is a "lithium-ion battery."
In fact, many domestic mobile phones of thousands or even hundreds of dollars will not use more safe lithium-ion polymer batteries for cost reasons, but use lithium-ion batteries, which invisibly increases the risk of explosion.
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