Gel-assisted synthesis of Cu Co S nanosheets for lithium-ion batteries

Abstract Self-assembled Cu Co S nanosheets with hierarchical structure have been obtained by means of a gelation-solvothermal process without using any surfactant or template and utilized as anode materials in lithium-ion batteries. The Cu Co S nanosheets display a reversible high specific capacity of 1045.1 mAh g −1 after 100 cycles at 200 mA g −1 and retaining a reversible specific charge capacity of 510.7 mAh g −1 after 500 cycles at 1 A g −1 with a retention of 94.5%. Combining the hierarchical structure with the unique chemical composition, synergetic merits are noticed. The improved electric conductivity, shortened Li + diffusion length and increased electrolytes penetration areas are achieved synchronously, giving rise to significant high capability and extraordinary cycling stability.