Enhancing electrochemical performance of SnO_(2) anode with humic acid modification

腐植酸对SnO_(2)负极电化学性能的改善作用

Humic acid(HA)was studied as a modifier in the SnO_(2) anode preparation for the electrochemical performance improvement.Scanning electron microscopy,180°peel test,and nanoindentation experiment were used to examine the influence of the HA on electrode.The results showed that the addition of HA could improve the dispersion uniformity of all particles.The components were tightened,increasing the difficulty of peeling off the film from the current collector.The deformation resistance of the electrode was greatly enhanced by the HA modification.The electrochemical test results showed that the anode from the normal micron-sized SnO_(2)particles with the HA modifier exhibited significant progress in electrochemical performance compared with those without HA.The reversible specific capacity of the SnO_(2) anode can be maintained as high as 733.4 mA·h/g at a current density of 100 mA/g after 50 cycles.Therefore,HA is a promising modifier for anode preparation of lithium-ion batteries.

研究腐植酸作为改性剂在SnO_(2)阳极制备过程中对其电化学性能的改善作用。采用扫描电镜、180°剥离实验和纳米压痕实验考察腐植酸对电极的影响。结果表明,腐植酸的添加能提高电极中颗粒的分散性能。各组分在腐植酸的作用下粘结得更加牢固,电极涂覆层在集流体上的黏附力增强。在腐植酸的作用下电极的抗变形性得到极大的改善。普通微米尺寸SnO_(2)电极材料的电化学性能在腐植酸的作用下得到显著的提高,在电流密度为100 mA/g下循环50次后,可逆比容量仍达733.4 mA·h/g。因此,腐植酸是一种具有广阔应用前景的锂离子电池负极改性剂。