Facile Synthesis of Binary Metal Selenide/Graphene Composite for Efficient Lithium-Ion Batteries

Abstract

During the last few decades, rapid industrialization not only resulted in the depletion of natural energy resources but also raised serious energy crises. Renewable energy resources are the most suitable alternative to overcome energy crises, but they are intermittent in nature and hence require energy storage systems for proper utilization in the grid. Developing a robust and low-cost energy storage system with high durability is expected to be the intimate solution to these issues. In recent years, Lithium-ion batteries (LIBs) have risen as the best energy storage devices for various applications. To deal with high energy storage demands, advanced materials possessing higher energy storage capability, excellent stability, and low cost are indispensable. Owing to the limited energy capacity of graphite, scientists are looking for alternate anodes of LIBs and due to the unique attributes of versatile material species, ample abundance, robust nature, and high theoretical capacities transition metal chalcogenides (TMCs) have been considered as promising anodes of LIBs. Within TMCs, binary metal containing TMCs have attracted further attend owning to higher electrochemical response attributed to the superior intrinsic conductivity, richer redox reactions, and facile easy processability. Herein, we have successfully synthesized a facile method to produce metalorganic framework (MOF) derived copper doped Zinc selenides deposited over reduced graphene oxide (CZS/rGO) as a promising anode material for LIBs. CZS/rGO possesses a hierarchically porous structure, high surface area, and metal like conductivity owing to the presence of binary metal ions and rGO. Hence, a smart selection of elemental composition along with carbon integration has improved the cycle life as well as resolved the inferior rate capability issues associated with transition metal chalcogenides. For evaluation of the performance of anode material, electrochemical analysis was performed by employing a the CZS/rGO in a coin cell. As-synthesized material exhibits sufficiently high reversible electrochemical energy storage capacity of 623.2 mA h g-1 at 0.1 A g-1 after 100 cycles, with a capacity retention of 73.8%. The excellent average rate capability of 750.3 mA h g-1 at 0.1 A g-1 and 119.4 mA h g-1 at 5 A g-1. Moreover, robust long-term cycling stability of about 605.2 mA h g-1 after 600 cycles at 0.1 A g-1 is obtained for LIBs. Keywords: Lithium-ion batteries, Sodium-ion batteries, Transition metal chalcogenides, Binary metal Selenides. Reduced graphene oxide, Metal-organic framework (MOF).

During the last few decades, rapid industrialization not only resulted in the depletion of natural energy resources but also raised serious energy crises. Renewable energy resources are the most suitable alternative to overcome energy crises, but they are intermittent in nature and hence require energy storage systems for proper utilization in the grid. Developing a robust and low-cost energy storage system with high durability is expected to be the intimate solution to these issues. In recent years, Lithium-ion batteries (LIBs) have risen as the best energy storage devices for various applications. To deal with high energy storage demands, advanced materials possessing higher energy storage capability, excellent stability, and low cost are indispensable. Owing to the limited energy capacity of graphite, scientists are looking for alternate anodes of LIBs and due to the unique attributes of versatile material species, ample abundance, robust nature, and high theoretical capacities transition metal chalcogenides (TMCs) have been considered as promising anodes of LIBs. Within TMCs, binary metal containing TMCs have attracted further attend owning to higher electrochemical response attributed to the superior intrinsic conductivity, richer redox reactions, and facile easy processability. Herein, we have successfully synthesized a facile method to produce metalorganic framework (MOF) derived copper doped Zinc selenides deposited over reduced graphene oxide (CZS/rGO) as a promising anode material for LIBs. CZS/rGO possesses a hierarchically porous structure, high surface area, and metal like conductivity owing to the presence of binary metal ions and rGO. Hence, a smart selection of elemental composition along with carbon integration has improved the cycle life as well as resolved the inferior rate capability issues associated with transition metal chalcogenides. For evaluation of the performance of anode material, electrochemical analysis was performed by employing a the CZS/rGO in a coin cell. As-synthesized material exhibits sufficiently high reversible electrochemical energy storage capacity of 623.2 mA h g-1 at 0.1 A g-1 after 100 cycles, with a capacity retention of 73.8%. The excellent average rate capability of 750.3 mA h g-1 at 0.1 A g-1 and 119.4 mA h g-1 at 5 A g-1. Moreover, robust long-term cycling stability of about 605.2 mA h g-1 after 600 cycles at 0.1 A g-1 is obtained for LIBs. Keywords: Lithium-ion batteries, Sodium-ion batteries, Transition metal chalcogenides, Binary metal Selenides. Reduced graphene oxide, Metal-organic framework (MOF).