Red phosphorus to increase the capacity of lithium batteries. Free Technical Library News

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Red phosphorus to increase the capacity of lithium batteries

01.08.2020

Scientists at the Argonne National Laboratory have made progress in creating a lithium-ion battery with increased capacity. The new development promises to increase the energy capacity of the anode material by a factor of ten and lead to batteries that are more capacious than today.

Modern lithium-ion batteries use a graphite anode. It is a battery-stable material. It does not crack even after 1000 charge and discharge cycles, although each such cycle is accompanied by saturation of the graphite anode with lithium and its subsequent return. And everything would be fine, only graphite has a relatively low energy capacity.

To gradually increase the capacity of lithium-ion batteries, new anode materials are needed. Two of the most promising materials are considered as such materials - silicon and phosphorus. Each of them has a theoretical energy capacity at least 10 times greater than graphite. Silicon anodes no longer seem like a fantasy and even promise to get into commercial products no later than in five years. But researchers at Argonne National Laboratory don't trust the material.

The scientists first made a composite anode using particles of black and then red phosphorus. Particles of phosphorus are crushed to a micrometer size and then combined with carbon particles of the same size. The resulting material showed a Coulomb efficiency of over 90%, which paves the way for commercial production of the composite anode.

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