As a portable energy storage device, lithium-ion batteries are widely used in mobile phones, notebook computers, cameras, electric bicycles, electric vehicles and other fields. Among them, the lithium battery electrolyte is an aspect that cannot be ignored. After all, the electrolyte, which accounts for 15% of battery cost, does play a vital role in battery energy density, power density, wide temperature applications, cycle life and safety performance.

Electrolyte is one of the four key materials of lithium batteries: positive electrode, negative electrode, separator and electrolyte. It is called the "blood" of lithium ion batteries and conducts electrons between the positive and negative electrodes of the battery. It is to obtain high-voltage and high-voltage lithium batteries to ensure advantages such as energy ratio.

As we all know, the main components of lithium-ion batteries include four aspects: positive electrode material, negative electrode material, electrolyte and separator. As an important part of lithium-ion batteries, electrolytes play an irreplaceable role in improving the cycle performance and energy density of lithium-ion batteries, thereby further increasing the range of electric vehicles. The energy density of lithium-ion batteries depends on the battery's voltage and capacity. In order to increase the energy density of the battery, in addition to increasing the capacity of the positive electrode material and the negative electrode material, another method is to increase the operating voltage of the battery. In this way, the battery will affect the electrolyte under high operating voltage. The high-pressure performance also puts forward new technical requirements.

The electrolyte plays a role in conducting electrons between the positive and negative electrodes of the lithium battery, which guarantees that the lithium ion battery can obtain the advantages of high voltage and high specific energy. Electrolyte is generally prepared from raw materials such as high-purity organic solvents, electrolyte lithium salts, and necessary additives under certain conditions and in certain proportions.

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