CNT及集流体对电池内阻增幅的影响

Influence of CNT and collector on the performance of the battery internal resistance increase

研究了正极使用0.5%碳纳米管（CNT）或导电涂层Al箔对锂离子电池内阻增幅的影响。充放电后,极片的剥离强度由常规极片的0增强至2.5-3.5 N。电池在2.50-3.65 V充放电,当电流分别为0.33 C和5.00 C时,极片的电阻率增幅由分别由常规极片的4倍和10倍下降至1.5倍和3倍。电池在化成、分容阶段及循环过程中的内阻增幅较常规电池低,以2.00 C循环900次,容量保持率较常规电池增加8%以上。正极使用0.5%CNT或导电涂层Al箔作为集流体,可降低电池在使用过程中内阻的增幅,提高电池的容量保持率。

The influence of the battery internal resistance increase was studied by adding 0. 5% carbon nano-tube（CNT） in positive pole or using conductive coating A1 foil as current collector. The peeling strength of the pole was increased from 0 to 2. 5 - 3. 5 N. The sheet resistivity increase was reduced, when charged-discharged in 2. 50 - 3.65 V, its 0. 33 C and 5.00 C sheet resistivity increase was reduced from 4 times to 1.5 times and from 10 times to 3 times. The battery internal resistance growth in formation, capacity grading phase and cycle process was less than normal battery, the capacity retention increased more than 8% after 900 cycles at 2. 00 C. The battery internal resistance increase was inhibited and capacity retention was increased by adding 0. 5% CNT in positive or using conductive coating A1 foil as fluid.