Introduction of Ternary Polymer Lithium Batteries and Low Temperature Ternary Lithium Batteries

Ternary polymer lithium battery

The three element polymer lithium battery refers to the lithium battery used for cathode materials, nickel cobalt lithium manganate (Li (NiCoMn) O2) three cathode material, and gel polymer electrolyte. As the transmission medium of ionic movement, electrolyte is usually composed of solvents and lithium salts. The electrolyte of lithium secondary battery mainly consists of liquid electrolyte, ionic liquid electrolyte, solid polymer electrolyte and gel polymer electrolyte. The electrolyte of two lithium batteries is mainly composed of liquid electrolyte, ionic liquid electrolyte, solid polymer electrolyte and gel polymer electrolyte. Gel polymer electrolytes consist of polymers, organic solvents and lithium salts, and are prepared by mixing organic electrolyte and solid polymer matrix. Because it exists in gel state, it has the advantages of both solid electrolyte and liquid electrolyte. Because the electrolyte is confined to the polymer chain, it also has high ionic conductivity (up to 10-3S/cm) in a wide temperature range. Its greatest advantage is the high mechanical strength of the diaphragm, which provides a large surface area. The thinner the film, the higher the energy density, because more active substances can be embedded in the battery. In addition, its electrochemical stability is also very good, high temperature resistance, most of the high temperature batteries on the market use polymer electrolytes.

Low Temperature Ternary lithium battery

The temperature characteristics of batteries are indicators of the reliability of batteries. The performance of batteries can also be evaluated by changing the ambient temperature. The low-temperature characteristics of lithium batteries are mainly investigated from the low-temperature discharge characteristics and cycle life. The most important thing of low-temperature batteries is to maintain the fluidity of materials under low-temperature conditions, so that lithium ions can freely shuttle between positive and negative electrodes to achieve battery charging and discharging. For example, using electrolyte with low melting point and reducing the particle size of active material will enhance the low temperature performance of the battery. This is due to the increase of lithium ion channels, which to some extent compensates for the slow movement of lithium ion at low temperature.

At present, domestic and foreign manufacturers of ternary lithium batteries can basically achieve discharge temperature of - 20 degrees, and discharge capacity is more than 50%, cycle life is about 500 times, can fully meet the normal use of solar street lamps. However, in the severe cold environment ofspecial, military equipment and other special products, or in the north, mountains and so on, lithium batteries must be able to achieve lower discharge operating temperature to meet harsh operating conditions.

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