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source:Industry News release time:2025-07-18 Hits: Popular:AG11 battery
The high - temperature stability of liquid lithium - ion batteries is a critical aspect that significantly impacts their performance, safety, and lifespan, especially in applications where elevated temperatures are common, such as electric vehicles in hot climates or electronic devices used in industrial high - temperature environments.
At high temperatures, several chemical and physical reactions occur within the battery that can degrade its performance. One of the primary concerns is the thermal decomposition of the electrolyte. Liquid electrolytes in lithium - ion batteries are typically composed of organic solvents and lithium salts. When exposed to high temperatures, these solvents can undergo oxidation and decomposition, producing gas by - products. This not only reduces the effective amount of electrolyte available for ion transport but also increases the internal pressure of the battery, potentially leading to swelling or even explosion in severe cases. To address this issue, researchers are developing new electrolyte formulations. For example, the use of high - temperature - resistant solvents, such as fluorinated carbonates, can enhance the thermal stability of the electrolyte. These solvents have higher boiling points and better resistance to oxidation, reducing the likelihood of decomposition at elevated temperatures.
The stability of the electrode materials is also crucial for high - temperature performance. The cathode materials, such as lithium cobalt oxide (LCO), lithium nickel manganese cobalt oxide (NMC), and lithium iron phosphate (LFP), can experience structural changes at high temperatures. For instance, LCO may undergo a phase transition at high temperatures, which can lead to a decrease in its capacity and an increase in impedance. To improve the high - temperature stability of cathode materials, surface modification techniques are being employed. Coating the cathode particles with a thin layer of materials like alumina or zirconia can act as a barrier, preventing the reaction between the cathode and the electrolyte and reducing the thermal degradation.
In addition, the separator in liquid lithium - ion batteries plays a vital role in maintaining high - temperature stability. At high temperatures, the separator may lose its mechanical strength and porosity, affecting the ion - conducting ability and potentially causing a short - circuit. To overcome this, separators with improved thermal stability are being developed. For example, ceramic - coated separators can withstand higher temperatures and maintain their structural integrity, ensuring the safe operation of the battery.
Overall, improving the high - temperature stability of liquid lithium - ion batteries requires a comprehensive approach that involves optimizing the electrolyte, electrode materials, and separator. Through continuous research and development, new materials and technologies are emerging, which will enable liquid lithium - ion batteries to perform reliably in high - temperature environments and expand their application scope.
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