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Lithium ion battery electrolyte requirements

From:CTECHI GROUP Limited     Release time:2019-09-09

Overview:Lithium ion conductivity: The electrolyte does not have electronic conductivity, but must have good ionic conductivity. In the general temperature range, the conductivity of the electrolyte is between 1×10-3 and 2×10-3S/cm. As an electrolyte, it must have excellent ionic conductivity and electronic insulation to make it function as an ion transport medium while reducing its own self-discharge.

Lithium ion battery electrolyte requirements

Lithium ion conductivity: The electrolyte does not have electronic conductivity, but must have good ionic conductivity. In the general temperature range, the conductivity of the electrolyte is between 1×10-3 and 2×10-3S/cm. As an electrolyte, it must have excellent ionic conductivity and electronic insulation to make it function as an ion transport medium while reducing its own self-discharge.

Ion migration number: The internal charge transport of lithium batteries depends on ion migration. The high ion migration number can reduce the concentration polarization during electrode reaction, resulting in high energy density and power density of the battery. The ideal lithium ion migration number should be as close as possible to 1.

Stability: When the electrolyte is in direct contact with the electrode, side reactions should be avoided as much as possible. This requires the electrolyte to have certain chemical stability and thermal stability.

Mechanical strength: Lithium-ion battery electrolytes need to have sufficient mechanical strength to meet the mass production packaging process of batteries. Li et al. used trimethyl phosphate (TMP) as an additive for high-voltage electrolytes and tested Li1.2Mn0.54Ni0.13Co0.13O2 as the positive electrode of the battery. The results showed that adding 1% TMP to the electrolyte can significantly improve Battery rate performance and cycle performance.

Excellent mechanical properties: Due to direct contact with the positive and negative electrodes, the polymer lithium battery electrolyte should have strong toughness, can withstand the change of stress during battery assembly, storage and use, and can not be brittle. At the same time, as a separator, it also has considerable mechanical strength to inhibit the generation and piercing of lithium dendrites and prevent short circuits between the positive and negative electrodes.


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