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Previously, researchers from the American Chemical Society had demonstrated that it could replace certain vinyl carbonates with propylene carbonate and add hexafluorophosphate to expand the operating temperature range of lithium-ion batteries. However, researchers hope to further expand the temperature range so that lithium-ion batteries can operate in environments ranging from minus 40 to 60 degrees Celsius.

Researchers tested the effects of five electrolyte additives on the performance of lithium-ion batteries within this temperature range and determined the optimal combination of three compounds added to the previous electrolyte solution. These three compounds formed a high conductivity, uniformity, and robustness protective layer on the anode and cathode. The discharge performance of batteries containing optimized electrolytes was improved at -40c, and the cycling stability was significantly improved at 25c, while the cycling stability was slightly improved at 60c.

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