The Application Of Bimetallic Organic Framework For Lithium-ion Batteries

Lithium-ion batteries(LIBs)as an important electric energy storage technology are widely used in our life.The study of the electrode materials for LIBs received widespread attention and related research work has already deeply developed.Metal-organic frameworks(MOFs)as a novel anode electrode material own many specialties such as the three-dimensional porous structure,the flexible aperture size and substitutable metal centers as well as ligands.These features make MOFs a promising electrode material for LIBs.Moreover,the bimetallic system exhibit outstanding performance over monometallic system.First,we prepared the MnCo-BTC by doping cobalt into Mn-BTC.Cobalt doped MnCo-BTC possessed higher capacity and better cycling stability compared with Mn-BTC.The characterization and electrochemical testing were carried out to understand the morphology features,composition and electrochemical properties.MnCo-BTC exhibited a preeminent capacity of 901 mAh·g-1 at a rate of 100 mA·g-1 after 150 cycles.Even the rate up to 500 mA·g-1,the MnCo-BTC still maintain the capacity of 445.3 mAh·g-1 after 100 cycles.We also studied a new bimetallic system MOFs,CoZn-BTC,as anode electrode material for LIBs.Through changing the reaction conditions such as reactant ratio,reaction time and whether applied thermal treatment,we screened out the most suitable synthesis condition and then measured the electrochemical performance of the products.Eventually,CoZn-BTC achieved the capacity of 994.7 mAh·g-1 at the rate of 100 mA·g-1 after 100 cycles.