摘要
研究正负极、电解液对锂离子电池低温性能的影响及作用机理。在低温-40℃下,采用小粒径LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)(D50=8μm)作为正极材料,与常规粒径LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)相比,1.00 C放电容量与额定容量之比提升了22%;采用倍率性更好的中间相碳微球(MCMB)作为负极材料,1.00 C放电容量为额定容量的72%,高于使用人造石墨的60%。在低温-40℃下,人造石墨负极的电荷转移阻抗大于MCMB;采用低温性能较好的LiBF4电解液制备的软包装电池,放电容量为额定容量的90%,但使用常规LiPF6电解液时只有70%,说明电池的低温性能得到提升。
The influence of cathode and anode,electrolyte on low temperature performance of Li-ion battery and the mechanism of action were studied.When small diameter LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)(D50=8μm)was used as cathode material,the ratio of discharge capacity to rated capacity at 1.00 C was increased by 22%at low temperature of-40℃compared with conventional particle size LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2).When mesocarbon microbead(MCMB)was used as anode material,the ratio of discharge capacity to rated capacity at 1.00 C was 72%,which was higher than 60%of using artificial graphite.When the temperature was-40℃,the charge transfer impedance of artificial graphite was greater than MCMB.The pouch battery prepared by LiBF4 electrolyte with better lowtemperature performance could maintain a ratio of 90%between discharge capacity and rated capacity,but was only 70%when using conventional electrolyte,indicating that the low temperature performance of the battery was improved.
作者
王远东
曹阳
邓鹤鸣
党伟
WANG Yuan-dong;CAO Yang;DENG He-ming;DANG Wei(State Grid Inner Mongolia Eastern Power Co.,Ltd.,Hohhot,Nei Monggol 010000,China;State Grid Power Research Institute Wuhan Nanrui Co.,Ltd.,Wuhan,Hubei 430074,China)
出处
《电池》
CAS
北大核心
2021年第5期494-497,共4页
Battery Bimonthly
基金
国网内蒙古东部电力有限公司科技项目(SGTYHT/19-JS-215)。
关键词
锂离子电池
低温
正极材料
负极石墨
粒径
电解液
Li-ion battery
low temperature
cathode material
anode material
particle size
electrolyte
作者简介
王远东(1969-),男,内蒙古人,国网内蒙古东部电力有限公司高级工程师,研究方向:高电压技术、输电线路运维等;曹阳(1984-),男,吉林人,国网内蒙古东部电力有限公司高级工程师,研究方向:电力系统;通信作者:邓鹤鸣(1979-),男,湖北人,国网电力科学研究院武汉南瑞有限责任公司高级工程师,研究方向:高电压技术;党伟(1984-),男,辽宁人,国网内蒙古东部电力有限公司高级工程师,研究方向:电气工程。
