Fabrication Of Nano Tube-Sheet Mutual Supported 3D Carbon And Its Properties As Li-Ion Battery Anode

Lithium-ion batteries(LIBs)have been extensively applied to many areas,such as portable electronics,electric vehicles and large-scale grid storage,etc.Therefore,it has become particularly urgent to find new anode materials with high theoretical capacity and excellent cycle performance to meet the increasing demand of high energy/power density LIBs.The researchers have focused on diverse carbon materials as Lithium-ion batteries(LIBs)anode,owing to their high chemical stability,high conductivity and broad availability.However,the theoretical capacity of commercial graphite is only 372 mAh/g,which is below the desire of the users.Considering the perspective of the overall performance of lithium-ion battery,many optimization strategies have been adopted,such as increasing the specific surface area and improving the pore structure to solve the problem of poor lithium storage performance of anode materials.However,it still faces many problems such as complicated procedures,high preparation costs,poor structural stability and low cycle life.Currently,the design of carbon based composite as high-performance anode materials for Lithium ion batteries is challenging for commercial concern.It has become one of the most popular research topics in the scientific and industrial fields.Herein,we developed a three-dimensional carbon based material with a nano tube-sheet mutual supported structure(MS-CNTS).The present work highlights a concise "solvent free" synthetic method that allowed large-scale production,which is potentially available for low cost commercial use.With the readily available acetylacetone(Hacac)and cobalt(Ⅱ)acetylacetonate(Co(acac)2)as starting chemicals,this nanostructured carbonaceous material is fabricated with the aldol condensation that constructs the Co-contained carbon-link network(Co@CLN)polymer precursor,then followed by annealing under argon.It is composed of the brimcurled graphene-like carbon nanosheet(CNS)and the carbon nanotube(CNT),which supported each other structure to effectively avoids agglomeration.Therefore,it enables high performance as LIBs anode.Despite of the trace amount of cobalt,it is still the carbon-based MS-CNTS anode,which delivers a high charge capacity of 1028 mAh/g at 0.1 A/g,high rate capacity of 495 mAh/g at 2 A/g.It owns a long cycling life with a very low capacity decay of 0.008%per cycle over 1000 cycles at 0.5 A/g.From full cells measurements,we further confirmed the considerable promise of the MS-CNTS as anodes with a long cycling life.Our study opens up a viable approach for the design 3D porous carbon based hybrids as lithium-ion battery anode materials with high storage capacity and structural stability.This methoed may be even effective as highly active carbocatalysts used in various chemical and electrochemical protocols,including the hydrogen evolution reaction(HER),the oxidation-reduction reaction(ORR),the oxygen evolution reaction(OER),as well as the catalytic coupling reaction and hydrogenation.