Methods for Improving Low-Temperature Performance of Lithium-ion Batteries

Jul 17, 2024

Positive electrode materials

The method of using materials with excellent conductivity to coat the surface of the active material body to improve the conductivity of the positive electrode material interface, reduce the interface impedance, and reduce the side reactions between the positive electrode material and the electrolyte to stabilize the material structure.
The material body is bulk-doped with elements such as Mn, Al, Cr, Mg, and F to increase the interlayer spacing of the material to increase the diffusion rate of Li+ in the body, reduce the diffusion impedance of Li+, and thus improve the low-temperature performance of the battery.
Reduce the particle size of the material and shorten the migration path of Li+. It should be pointed out that this method will increase the specific surface area of the material and thus increase the side reactions with the electrolyte.

Electrolyte

Improve the low-temperature conductivity of the electrolyte by optimizing the solvent composition and using new electrolyte salts.
Use new additives to improve the properties of the SEI film to facilitate the conduction of Li+ at low temperatures.

Negative electrode materials

Selecting appropriate negative electrode materials is a key factor in improving the low-temperature performance of batteries. Currently, the low-temperature performance is mainly optimized through negative electrode surface treatment, surface coating, doping to increase interlayer spacing, and controlling particle size.

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