The Preparation And Lithium Storage Properties Of Sn Based Microbelt Electrode Research

Lithium ion batteries?LIBs?plays a significant role in the field of electrochemical energy storage,Tin-based materials are a promising anode material for lithium-ion batteries due to their high theoretical capacity,safe reaction potential,abundant natural reserves and low price.In this paper,we prepared Sn-based nanobelts and designed a variety of Sn-based and carbon-composite microbelts.The composition,morphology and electrochemical properties of the microbelts were studied.The main research work and conclusions are as follows:?1?We successfully prepared tin oxide/C nanobelts by electrospinning technology.The material is used as a negative electrode material for lithium ion batteries.It exhibits excellent electrochemical performance,including high reversible cycle capacity and excellent cycle performance.After the cycle,its capacity still reaches 768 mAh g^-1.At the same time,a large number of samples can be obtained by electrospinning,which is expected to make the material commercially available in the near future.The method is simple,high-efficiency,can obtain a number of products,and is non-toxic,non-polluting,and belongs to an environment-friendly material,which plays a positive role in environmental pollution and has a good application prospect.?2?The electrostatic spinning technology combining with the thermal annealing process were prepared successfully U-SnO₂NPs@CF-MBs composites.As lithium ion battery cathode material,in the half cell and full cell electrochemical performance tests,we found that the transformation between Sn and SnO₂ is highly reversible.Under the current density of 0.2 A g^-1,half cell can provide specific capacity up to 925 mAh g^-1,under current density of 5 A g^-1 can provide specific capacity up to 464 mAh g^-1 and under current density of 1.5 A g^-1 cycle after 1000 times still can provide specific capacity up to 788 mAh g^-1.Full cells under current density of 0.2 A g^-1 cycle after 80times still can provide specific capacity up to 510 mAh g^-1.The U-SnO₂NPs@CF-MBs composites combined with LiCoO₂ batteries can light up 32 parallel LED lights for more than 40 minutes.These test results illustrate the strategy tanking advantage of common micron material and nano material can improve SnO₂ in electrochemical performance of the next generation of LIBs.At the same time,this technique can be easily extended to other related materials synthesis.?3?The core-shell structure SnO₂@C microbelts was prepared by electrospinning and water bathing.The structure and microstructure of the sample were characterized by conventional characterization methods.The experimental results show that the reversible capacity of the core-shell SnO₂@C composite micro-electrode keep 1227 mAh g^-1 after300 times at 0.3 A g^-1 current density.The reversible capacity of the cycle at a current density of 10 A g^-1 is still 509 mA h g^-1.In the full cell test,the capacity was 588 mAh g^-1after 100 cycles at a current density of 0.3 A g^-1.The conversion of Sn and SnO₂ is highly reversible,whether it is tested in a half cell or a full cell.This work can promote the use of micron-scale core-shell structure SnO₂@C composites in commercialization.