According to foreign media reports, when the winter climate becomes cold, vehicles are often prone to problems. Electric vehicles have a similar situation, when the temperature dropped to freezing, the lithium-ion battery power will be lost. Researchers now offer a new strategy for evading battery driving kinetics. The study involved a battery system that used a hard-tolerant hard carbon anode and a powerful lithium-rich cathode.

"Non-graphitizable" or "hard" carbon is a low-cost electrode material in the battery and has a promising market. Even at low temperatures, it can exhibit its rapid intercalation kinetics of lithium ions. During charging and discharging of the battery, lithium ions can move from the anode to the cathode through the electrolyte, and vice versa.

If the anode material (anode material) is usually graphite, it can contain pre-stored lithium ions. When lithium ions enter, the volume of the lithium ion will change, ensuring the service life of the core is longer, and rapid reaction power can be realized during charge and discharge. learn. It has been confirmed that Prelithiated hard carbon is a powerful lithium ion capacitor material. However, the pre-lithiation process is complicated and expensive, involving pure lithium electrodes.

In contrast to finding other lithium electrodes, the researchers introduced a lithium-rich vanadium phosphate cathode that can be used for lithiation and conventional battery operations. During the first charging process, some lithium ions are lost when lithium ions flow from the cathode to the anode. In this process, lithium ions are embedded and stored. Then, the researchers will be lithium ion reduced vanadium phosphate cathode and pre-lithiated hard carbon anode (LixC), thus forming a lithium-ion battery operating system. According to researchers, the battery retains the high energy density of conventional lithium-ion batteries, while also demonstrating the high power and long life of similar supercapacitors.

In addition, at minus 40 degrees Celsius, its power reserves account for 2/3 of the total. In comparison, the conventional lithium battery has only 10% of its charge. This is mainly due to the natural characteristics of the vanadium phosphate cathode and the fast reaction kinetics of the pre-lithiated hard carbon anode. Currently, researchers are conducting further tests to improve other parameters of the electrochemical cell.

However, there is a flaw in the product. Under extremely cold conditions, its electrolyte will lose its conductivity. If this problem can be solved, the battery system may be able to provide an attractive product design, achieve its best performance, and improve the cold resistance of the electric vehicle engine.

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