多孔芳香骨架负载二氧化锡锂电负极的制备与性能

Preparation and properties of SnO2 in carbonized porous aromatic framework （PAF-41） matrix as anode for lithium-ion batteries

为了提高SnO2基负极材料的电化学性能,采用简单的聚合反应制备了具有高比表面积与多级分孔结构的芳香骨架PAF-41,并用于负载SnO2;利用PAF-41的分级多孔结构来保护SnO2,确保充分反应并抑制其粉化、团聚,提高SnO2电极的循环稳定性;通过TG、XRD、SEM、TEM、BET、恒电流充放电测试等方法对样品的结构及电化学性能进行了表征。结果表明:负载后得到SnO2质量分数为20%的复合材料,由于孔道限制作用,SnO2粒径小且均一,在PAF-41中分散性良好,复合材料孔道能提供足够的空间缓解SnO2的体积变化;电化学测试结果表明,SnO2/PAF-41复合材料电极具有优异的倍率性能与循环稳定性,在0.2 A/g电流密度下,循环超过300圈后容量仍能保持为618.9 mA·h/g。

In order to improve the electrochemical performance of SnO2-based anode materials,polymer of porous carbon(PAF-41)with large specific surface area and abundant through-channels was prepared by simple polymerization,and used to load SnO2.The graded porous structure of PAF-41 is used to protect SnO2,so that it can fully react without pulverization and agglomeration,and improve the cycle stability of SnO2 electrode.Thermogravimetric analysis,X-ray diffraction,scanning electron microscopy,transmission electron microscope,Raman spectroscopy,Brunauer Emmett teller and galvanostatic charge-discharge were used to research and characterize the structure and electrochemical properties of the samples.The results show that after loading SnO2,a composite anode material with a SnO2 content of 20%is obtained.SnO2 has good dispersibility in PAF-41 and limits the particle size of SnO2,and provides enough space to alleviate the volume change of SnO2.Electrochemical test results show that SnO2/PAF-41 composites have excellent rate performance and cycle stability.After more than 300 cycles under 0.2 A/g,the capacity can reach 618.9 mA·h/g.