Abstract

Lithium transition metal orthosilicates, Li2MSiO4 (M=Mn, Fe, Co), have received great attention because of the theoretical possibility to reversibly deintercalate two Li+ ions from the silicate structure. However, the silicates still suffer from low electronic conductivity, sluggish lithium ion diffusion and poor structural integrity upon electrochemical cycling. Recently, sodium transition metal orthosilicates, Na2MSiO4 (M=Mn, Fe, Co), have been reported to be used as a cathode material for sodium secondary battery. In this research, lithium/sodium transition metal orthosilicate A2MSiO4 (A=Li or Na; M= Mn, Fe or Co) nanostructures with preferential exposures of various crystallographic planes on the surface were synthesized via a facile and efficient solvothermal process. Detailed microscopic and spectroscopic analyses are performed to get a better understanding of the electrochemical performance-structure correlations in the crystal habit-tuned A2MSiO4 nanostructures. We anticipate that this novel strategy should shed light on the design and development of a wide range of high capacity intercalated cathode materials for lithium/sodium ion batteries.

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