Fluorinated electrolyte is a promising candidate to replace the regular carbonate based electrolyte because of its impressive anodic stability, conductivity as well as thermo-stability. Yet, most of the fluorinated electrolyte studies focused on the interfacial reaction and electrochemical performance. Although it is equally critical in understanding the interaction between different electrolyte systems and the bulk cathode structure to improve the energy density of the whole cell, the research regarding this topic is limited. In this work, bulk electrode analysis via in-situ XRD technique was carried out to unveil the high Nickel cathode structural changes by using different electrolytes and the results indicate the use of fluorinated electrolyte can mitigate the electrolyte decomposition. Most importantly, it can also assist the preservation of the crystal structure of high Nickel cathode by inhibiting the loss of active Li ion and transition metal during cycling. All results converge to the conclusion that the use of fluorinated electrolyte can not only stabilize the interface but also conserve the bulk structure.

Advanced in situ X-ray diffraction in revealing the structural changes of high voltage cathode under the effect of different electrolytes

2019 Spring National Meeting

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