Fabrication Of Flexible Anode Materials For Flexible Battery Via Electrospinning

For the development of flexible and foldable electronic devices,the development of lightweight,thin and flexible rechargeable energy storage solution has become a hot research area.However,the electrochemical performance of flexible lithium-ion battery,especially at fast charge and discharge rates,is still far from the traditional lithium-ion battery level,and it is difficult to meet the requirement for a practical application.In recent years,the development of nano-materials has brought new opportunities for the development of high-performance lithium ion batteries.In this paper,new nano-carbon fiber composites are prepared by electrospinning,which exhibit good flexibility and good mechanical properties.Finally,we study the electrochemical properties of the composites as freestanding electrodes.1.Study on synthesis of V₂O₃/CNFs composite and characterization of its structure and electrochemical propertiesFlexible nano-felts are prepared from electrospun carbon nanofibers?CNFs?embedded with V₂O₃ nanoparticles?V₂O₃/CNFs?and directly applied as freestanding electrodes for high-performance lithium ion batteries?LIBs?.V₂O₃ nanoparticles are uniformly dispersed or embedded in CNFs.V₂O₃/CNFs has good conductivity.The flexible membrane is an open three-dimensional structure,providing a channel for the rapid transmission of lithium ions and increasing the V₂O₃ surface active sites.Under the current density of 100 mA g^-1,the specific capacity of the flexible V₂O₃/CNFs composite electrode can reach 500 mAh g^-1.At the high current density of 5 A g^-1,100mAh g^-1 capacity is still available after 5000 cycles,showing excellent electrochemical performance.The above experimental results show that the material can be used as a freestanding electrode in the energy storage field.2.Study on synthesis of MnS/CNFs composite and characterization of its structure and electrochemical propertiesMnS/CNFs composites were prepared by electrospinning,and their electrochemical properties were tested as anode for lithium ion and sodium ion batteries.The MnS nanoparticles in the composite fibers are about 5 nm in diameter and are uniformly dispersed or embedded in carbon nanofibers?CNFs?.Carbon nanofibers not only act as electronic conductors,but also inhibit the volume expansion of MnS during electrochemical reaction.As a Li-ion battery anode,this hybrid electrode exhibits specific capacity from 240 mAh g^-1 at a high current density of 5 A g^-1,up to 600 mAh g^-1 at 200 mA g^-1.The MnS/CNFs electrode retained a specific capacity of 230 mAh g^-1 at a current density of 20 mA g^-1 after 200 cycles as the Na-ion battery anode.