ABSTRACT
In the pursuit of high energy batteries, Li2FeSiO4 cathode with ultrahigh theoretical capacity has drawn great attention. However, engineering the Li2FeSiO4 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 Li2FeSiO4 and Li2FeSiO4/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 Li2FeSiO4 product is still constrained by poor conductivities; in contrast, the impurity-free Li2FeSiO4/C composite exhibit greatly improved electrochemical performances.
Acknowledgments
This work was primarily supported by the Ningxia Key Research and Development Project (2015DY002). This work was also supported by National Science Foundation of China (NSFC-51462029), open project of State Key Laboratory for Mechanical Behavior of Materials (20161811) and Technology Leading Talent Program of Ningxia province (KJT2016003).
Disclosure statement
No potential conflict of interest was reported by the authors.