A Cost-Effective Composite Design that Enables Higher Capacity and More Robust High Power Lithium-Ion Batteries
This lithium-ion battery electrode design provides greater capacity for high power applications and longer life for commercial batteries. In the age of wireless electronics and electrically charged vehicles, the delivery of a robust, high power performing battery is essential. On average, more than five billion lithium-ion commercial batteries are bought by American consumers annually, and their demand will continue to increase as wireless device applications expand. In a typical commercial battery, the electrode fails to achieve uniform current distribution. This uneven current distribution can lead to local over-charge/discharge, underutilization of high power capacity, and reduced energy and power in batteries. University of Florida researchers have developed a lithium-ion battery electrode design that achieves a more uniform current, increasing high power performance and extending the cycle life. By incorporating higher potential material in less accessible portions of the electrode, a more even current distribution can be achieved, providing a more robust battery with better high power capabilities.
Lithium-ion-based battery electrode design that increases performance in high power applications and extends cycle life
- Provides greater capacity for high power performance, increasing the battery’s range of commercial applications
- Enables internal protection, preventing over-charge/discharge rates
- Increases overall battery performance, achieving a safer, more robust, extended life battery
The battery design combines lithium-ion battery chemistries into a single, positive electrode. One possible combination of common active materials could include lithium manganese oxide (LMO) and lithium iron phosphate (LFP), though any two materials stable at each other’s nominal voltage would work. The current distribution is artificially evened out in the electrode by using the active materials at different nominal voltages. By placing higher voltage material in the poorly participating portions of the electrode, the current is biased to these otherwise inaccessible areas. Besides attaining greater high rate capacity, the effect on the electrolytic current can deter failure modes resulting from non-uniform currents such as “soft-shorts.”