Application of nickel-cobalt hydrotalc nanocage/GO composite in the anode of lithium-ion batteries
In recent years,layered double hydroxides(LDH)material is considered to be an alternative material of high performance lithium ion battery(LIBs)because of its adjustable composition,structure and morphology.However,LDH as a negative pole still has problems such as poor conductivity and easy structure aggregation.At the same time,metal-organic frameworks(MOFs)and carbon-based materials have also attracted wide attention in the field of energy storage due to their excellent porosity,specific surface area and good conductivity.Considering the main defects of LDH,presents a combination of in situ precipitation,chemical etching and electrostatic adsorption method,so that hollowed Ni-Co layered double hydroxide polyhedron(H-(Ni,Co)-LDHP)can be fixed on GO,resulting in hollowed Ni-Co layered double hydroxide polyhedron/graphene oxide composite(H-(Ni,Co)-LDHP/GO).This densely distributed hollow nanostructure on GO can more effectively inhibit the aggregation of hydrotalc nanosheets and facilitate the unembedding of lithium ions.H-(Ni,Co)-LDHP/GO nanocomposite,as the negative electrode of lithium-ion battery,achieves the first cycle efficiency of 68％at the current density of 50 mA·g-1,and the capacitor retention rate after 50 cycles is 68.4％.
lithium-ion batterylayered double hydroxidesanode material
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