Researchers working at the Deutsches Elektronen-Synchrotron have discovered the reason why fast cycled lithium-ion batteries fail after repeated cycling.
Using a novel Xray fluorescence detector they were able to determine the precise distribution of nickel and manganese over a large area of the electrode.
The scientists were able to show that during fast charging, manganes and nickel atoms are literally leached from the electrode structure, creating holes up to 100 microns in diameter. These destroyed areas could no longer be utilised for lithium storage.
What’s uncertain is what happens to the leached material. There are indications that it settles on the battery anode, creating even more damage.