Lithium iron phosphate (LFP) batteries have become one of the biggest success stories in modern energy storage. However, it would be great if they could store even more. Hence our interest in boosting lithium iron phosphate cathodes to achieve this goal.
Range of Applications For Lithium Iron Phosphate
Manufacturers use LFP batteries in electric vehicles, home energy systems, backup power units, and large grid-storage projects. Their popularity is due to a combination of safety, long life, reliability, and relatively low cost.
Key Materials in Lithium Iron Phosphate Batteries
The positive electrode uses lithium iron phosphate. This stable material stores and releases lithium ions during charging and discharging. Its strong chemical structure also helps reduce overheating risks.
The negative electrode usually contains graphite. This affordable, reliable layered carbon material stores lithium ions during charging, and releases them as the battery supplies power.
Most LFP batteries deliver thousands of charge-discharge cycles before their capacity declines significantly. They also tolerate frequent charging, making them suitable for daily use. It seems a pity to recycle their materials when boosting lithium iron phosphate battery cathodes may be all we need.
Restoring Lithium Iron Phosphate Cathodes
It seemed a great pity to University of California scientists, to recycle the cathodes in used LFP batteries down to their raw materials. Why not, they must have asked themselves, upgrade the lithium iron phosphate battery to more powerful lithium manganese iron phosphate instead?
Upgrading LFP to Lithium Manganese Iron Phosphate
LFP batteries use a material that contains lithium, iron and phosphate. To create the more powerful lithium manganese iron phosphate cathode (LMFP), the researchers replaced some of the iron with manganese while keeping the same basic crystal structure.
Boosting the lithium iron phosphate cathodes this way, allowed the positive electrode to hold energy at a higher voltage, which increased the battery’s energy storage.
Testing the LMFP Cathode Confirms Success
The result is a battery that delivers more range or runtime, while still retaining much of the safety, durability and lower cost that made LFP batteries popular.
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