rGO/CNTs复合正极对锂空气电池放电容量的影响

With consumers' pursuit of long driving ranges for electric vehicles, lithium-air batteries have broad application prospects in fields such as electric vehicles due to their extremely high theoretical energy density. Reduced graphene oxide (rGO) was self-prepared by the Hummers method and compounded with carbon nanotubes (CNTs) in different mass ratios to prepare rGO/CNTs composites as the cathode of lithium-air batteries. The effects of the rGO/CNTs composites and their structures on the electrochemical performance and discharge capacity of lithium-air batteries were investigated. The results show that when the mass ratio of rGO to CNTs in the composite is 3:1, the number of mesopores and the average pore size of the rGO/CNTs composite increase significantly. At the same time, the rGO/CNTs composite cathode exhibits good redox performance and a low charge transfer impedance, and the lithium-air battery shows excellent electrochemical performance, with its specific discharge capacity being significantly improved, reaching 13677 mAh/g.

随着消费者对电动汽车长续航里程的追求,锂空气电池因其超高的理论能量密度,在电动汽车等领域具有广阔的应用前景。通过Hummers法自制还原氧化石墨烯(rGO),将其与碳纳米管(CNTs)按照不同质量比复合,制备rGO/CNTs复合材料作为锂空气电池正极,考察了rGO/CNTs复合材料及其结构对锂空气电池电化学性能和放电容量的影响。结果表明,当rGO与CNTs复合质量比为3 : 1时,rGO/CNTs复合材料的介孔数量和平均孔径明显增加。同时,rGO/CNTs复合正极表现出良好的氧化还原性能和较低的电荷传输阻抗,锂空气电池展现出优异的电化学性能,其放电比容量得到显著提升,达到13677 mAh/g。