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The key to improving the low-temperature performance of lithium-ion batteries lies in the improvement of the low-temperature performance of electrolytes. Conventional commercial lithium-ion battery electrolytes will rapidly increase in viscosity at low temperatures. Therefore, the key to improving the low-temperature performance of lithium-ion batteries is to improve the low-temperature performance of the electrolyte.

Electrolyte salts are an important component of electrolytes and a key factor in achieving excellent low-temperature performance. At present, the commercial electrolyte salt is Lithium hexafluorophosphate, and the SEI membrane formed has a large impedance, leading to its poor low-temperature performance. The development of new lithium salt is imminent. Lithium tetrafluoroborate has small anion radius, easy association, lower conductivity than LiPF6, but low charge transfer impedance at low temperature. As an electrolyte salt, it has good low-temperature performance.

Improving the ion conductivity of SEI films at low temperatures by optimizing their composition and film-forming conditions is beneficial for improving the low-temperature performance of batteries. Therefore, developing film-forming additives with excellent low-temperature performance is currently a research hotspot.

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