摘要
为了探究不同N/P对磷酸铁锂电池性能的影响,以磷酸铁锂为正极材料,人造石墨为负极材料,通过叠片工艺制备了4种不同N/P比(1.02、1.06、1.10、1.14)的磷酸铁锂电池,并通过电化学测试表征了不同N/P下电池的首次放电效率、倍率充放电性能、充放电DCR、高低温放电以及45℃循环性能。结果表明:相比于N/P(1.02、1.06),N/P比为1.10、1.14时,其充电DCR在60%、30%SOC时小4 MΩ左右,使其在大倍率充电和低温条件下极化更小;随着N/P的增加,充电恒流比有所提高,且0℃下的放电容量保持率得到改善;当N/P比为1.10时,其45℃循环容量保持率在循环1000圈后仍为91.8%,明显优于其他组(N/P比为1.02、1.06)。该实验设计及结果有望为以后的研究者对于磷酸铁锂电池的设计开发提供理论依据。
In order to explore the influence of the N/P ratio on the performance of lithium iron phosphate batteries,four kinds of N/P ratios of lithium-ion batteries were fabricated by using lithium iron phosphate as the cathode material and artificial graphite as the anode material.The effects of the first discharge efficiency;charge and discharge performance at different current intensities;charge and discharge DCR;discharge capacity at high and low temperatures;and cycle performance at 45℃using different N/P ratios were studied by electrochemical technology.The results show that the charge DCRs of lithium-ion batteries at 1.10 and 1.14 are about 4 MΩsmaller than those of N/P ratios(1.02 and 1.06)at 60%and 30%SOC,making them less polarized under high current intensities and low temperature conditions.With the increase of N/P,the charging constant current ratio and capacity retention rate at 0℃are improved.The capacity retention rate is still 91.8%after 1000 cycles at 45℃when N/P is 1.10,which is significantly higher than other groups(N/P ratios at 1.02 and 1.06).This research could provide a theoretical basis for future investigation of the design and use of lithium iron phosphate batteries.
作者
刘范芬
陈诚
朱智渊
张伟康
吕正中
LIU Fanfeng;CHEN Cheng;ZHU Zhiyuan;ZHANG Weikang;LYU Zhengzhong(Hubei EVE Power Co.,Ltd.,Jingmen 448000,Hubei,China)
出处
《储能科学与技术》
CAS
CSCD
北大核心
2021年第4期1325-1329,共5页
Energy Storage Science and Technology
关键词
磷酸铁锂电池
N/P比
倍率充放电
DCR
循环性能
lithium iron phosphate batteries
N/P ratio
charge and discharge at different current density
DCR
cycle performance
