摘要
超级电池是一种新型的将铅酸蓄电池和超级电容器合并在一个单体电池内的混合型储能装置,具有长的循环寿命、高的比能量和比功率。在高倍率充放电时超级电容器可以作为"缓冲器",迅速地发生电荷的分离和中和,在降低成本的同时增加了电池的使用寿命。研究了12 V/10 Ah超级电池负极板不同合膏工艺对电池性能的影响。结果表明采用湿混合膏工艺制备的超级电池的循环寿命可达到6 972次。扫描电子显微镜(SEM)图显示湿混制备的负极板材料海绵铅结晶颗粒细小且分布更均匀。X射线衍射(XRD)分析比较得知湿混合膏有利于负极板活性物质的结晶。通过对电化学阻抗图拟合分析,发现湿混合膏可以提高负极板中碳材料的电容性,降低微孔内部及颗粒之间的离子迁移电阻,有利于提高电化学活性。
The ultrabattery is a new hybrid energy storage device which combines an asymmetric supercapacitor and a lead-acid battery in one unit cell that has great advantages in terms of good performance,long cycle-life and high specific energy and specific power.It acts as a buffer during high-rate charging and discharging,therefore it enables to provide and absorb charge rapidly during vehicle acceleration and braking.Consequently,it can reduce the cost and increase batteries cycling lifetime.The influence of different negative active materials paste techniques on the 12 V/10 Ah ultrabattery was discussed in this article.The results show that battery with wet mixing paste technique manifests better performance with more longer cycling life.The cycling life experiments demonstrate that the life cycles can reach 6 972.The SEM patterns indicate that the size of negative active particles with wet mixing paste technique is smaller and homogeneous distribution.The XRD analysis results show that the wet mixing paste technique is useful to crystallize the negative active material.From the fitting of EIS patterns,it is known that the wet mixing paste technique can improve the capacitive of negative material,and decrease the resistance of ion transfer between the Millipore and particles to improve the electrochemical activity.
出处
《电源技术》
CAS
CSCD
北大核心
2013年第1期86-88,共3页
Chinese Journal of Power Sources
关键词
超级电池
循环寿命
合膏工艺
ultrabattery
cycling life
paste technique
