Abstract
The growing demand for Li-ion batteries requires the development of inexpensive materials that can be made in a sustainable fashion. Here we report a new low-temperature preparation for and the first electrochemical characterization of LiFeSi2O6, a hugely Earth-abundant, rock-forming mineral. We have found that LiFeSi2O6 undergoes a reversible electrochemical reaction against Li centered around 2 V with capacities near 60% of the theoretical maximum. We employ high resolution synchrotron X-ray and neutron diffraction to characterize the structure and correlate the rigid connectivity of the framework with the very slow kinetics of diffusion.
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