摘要
本文研究了使用涂碳铝箔作为正极集流体磷酸铁锂电池的性能。研究对比了使用普通铝箔和涂层铝箔的10Ah软包磷酸铁锂电池的主要性能。研究表明：使用涂层铝箔不但可以提高磷酸铁锂材料的粘结性，而且使用导电涂层可以有效降低正极材料和集流体的接触内阻．从而减小电池内阻，提高电池倍率性能。与使用普通铝箔作为集流体相比，通过使用涂碳铝箔可以使得电池的内阻降低65％左右，但是，磷酸铁锂正极材料的克容量却偏低约5-10mAh·g-1，首次效率也偏低4％左右；在快速放电15C倍率下．使用涂碳铝箔的电芯比使用普通铝箔容量提高约15％左右，10C放电倍率下，平台增加0.3-0．4v；使用涂碳铝箔电芯的常温自放电率较高，但容量恢复率也较高：550周循环下，使用涂碳铝箔可以使得电池的循环性能提高约1％。而在电池低温性能方面．使用涂碳铝箔对低温性能并无改善。
The LiFePO4-based battery properties were studied by using aluminum foil current collector coated with a conductive carbon film. The main properties of LiFePO4 type battery with 10 Ah capacity were also compared by using common aluminum foil and coating carbon aluminum foil （CCAF） from different providers. The results showed that the using of CCAF current collector not only can improve the cohesiveness between the cathode powder and the current collector but can effectively reduce the contact resistance of the cathode material and the current collector, so as to reduce the direct current resistance （DCR） of the battery, and improve the rate performance of the battery. Compared with using common aluminum foil, the DCR is reduced by about 65% with using the CCAF as current collector. But the specific discharge capacity of cathode material is reduced by 5-10 mAh·g-1. And the 1st efficiency is also reduced by 4%; At large discharge rate of 15C rate, the discharge capacity of the cell with using CCAF is more than about 15% in contrast to the cell with common aluminum foil as a current collector. And at 10C discharge rate, the voltage plateau increased by 0.3-0.4 V with CCAF; But the self-discharge ratio of cell with CCAF is higher at room temperature, and its recovery rate of the capacity is also higher; After 500 cycles, the cyclic capability of the cell with using CCAF can increase by about 2% in contrast to the cell with the common aluminum foil as current collector. But the discharge property at low temperature is not improved by the use of CCAF as current collector.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2014年第4期770-778,共9页
Chinese Journal of Inorganic Chemistry
基金
国家973项目(No.2009CB220100)
动力电池及化学能源材料北京市高等学校工程研究中心开放基金资助课题(2013),高性能二次动力电池及关键材料、技术的合作研究(No.2010DFB63370)、面向中美清洁能源合作的电动汽车前沿技术研究(No.2010DFA72760)
中央高校基本科研业务费(No.12QNJJ013)资助项目
关键词
磷酸铁锂电池
涂碳铝箔
集流体
倍率性能
循环性能
LiFePO4 battery
coating carbon aluminum foil
current collector
rate performance
cycle performance
