Investigation on Li2FeSiO4 and Li2FeSiO4/C synthesised through facile solid-state reaction. (23rd August 2020) - Qiao, Huali
ABSTRACT: In the pursuit of high energy batteries, Li2 FeSiO4 cathode with ultrahigh theoretical capacity has drawn great attention. However, engineering the Li2 FeSiO4 cathode to achieve satisfactory electrochemical performances are severely impeded by stubborn impurities, low intrinsic conductivities and complex synthesis procedure. In this work, facile solid-state reaction is investigated to synthesise high purity Li2 FeSiO4 and Li2 FeSiO4 /C cathode. It is found that the choice of precursors plays a crucial role in suppressing the formation of impurities. The accessible capacity of high purity Li2 FeSiO4 product is still constrained by poor conductivities; in contrast, the impurity-free Li2 FeSiO4 /C composite exhibit greatly improved electrochemical performances.