Square li-polymer

Square li-polymer
Lithium-ion batteries are divided into square lithium batteries (such as commonly used mobile phone batteries), cylindrical lithium batteries (such as 18650, 18500, etc.) and button lithium batteries according to their shapes; Lithium batteries are divided into aluminum shell lithium batteries, steel shell lithium batteries and soft package batteries according to the outsourcing materials; According to the anode materials, it is divided into lithium cobaltate, lithium iron phosphate, lithium manganate and lithium polymer.
 
 
The service environment of lithium ion battery is also very important to its cycle life. Among them, ambient temperature is a very important factor. Low or high ambient temperature will affect the cycle life of lithium battery.
 
The charge and discharge performance of C/LiCoO2 lithium ion battery at-20℃ was studied. The results show that the discharge performance of the battery deteriorates at low temperature, and the discharge capacity at 0.2 C is only 77% of that at normal temperature, and the discharge capacity at 1 C is only 4% of that at 0.2 C.. With the increase of constant voltage charging time at low temperature, the charging performance deteriorates obviously.
 
The main reasons for the reduction of the capacity of lithium ion batteries at low temperature include the deterioration of electrolyte conductivity, the deterioration of the wettability and/or permeability of the separator, the slow migration of lithium ions, and the slow charge transfer rate at the electrode/electrolyte interface. In addition, the impedance of SEI film will increase at low temperature, which will slow down the speed of lithium ions passing through the electrode/electrolyte interface. Among them, the reason for the increased impedance of SEI film is that lithium ion is easy to escape from negative electrode at low temperature and difficult to embed. When charging, lithium metal will appear and react with electrolyte, forming a new SEI film covering the original SEI film, which increases the impedance of the battery and leads to the decrease of the battery capacity.
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