Phys.org October 4, 2022
Accurate assessment of the reversibility of electrodes is crucial for battery performance evaluations. However, it is challenging to acquire the true reversibility of the Li anode in lithium-metal batteries, mainly because an excessive amount of Li is commonly used. An international team of researchers (China, USA – UC San Diego, University of Chicago) proposed an analytic approach to quantitatively evaluate the reversibility of practical lithium-metal batteries. They identified key parameters that govern the anode reversibility and subsequently established their relationship with the cycle number by considering the mass of active and inactive Li of the cycled Li anode. They showed that the mass of active Li can be quantitatively distinguished from the mass of inactive Li of the cycled anodes in Amp hour-level pouch cells. According to the researchers their work opens an avenue for accurately assessing degradation and failure in lithium-metal batteries…read more. TECHNICAL ARTICLE
The method for decoupling and quantifying “active Li” and “dead Li.” Credit: NIMTE