摘要
对比电解液中含添加剂1%己二腈(ADN)与1%1,3,6-己烷三腈(HTCN)的高电压钴酸锂/石墨电池的性能。以1 C在3.0~4.5 V充放电,添加HTCN的电池在25℃下循环650次的容量保持率为88.2%,在45℃下循环450次为88.8%。电化学阻抗谱表明,ADN和HTCN的加入能抑制电解液的分解和材料破坏,HTCN整体上优于ADN。计时电流法、扫描电镜结果表明,ADN和HTCN的加入能抑制电解液的分解,二者作用相当。X射线光电子能谱与电感耦合等离子体发射光谱表明,ADN和HTCN均能在钴酸锂表面成膜,添加HTCN的电池,负极与隔膜上的钴沉积量约为添加ADN电池的1/2。
The performance of high-voltage lithium cobaltate/graphite batteries with electrolyte contained additives 1%adiponitrile(ADN)and 1%1,3,6-hexanetrinitrile(HTCN)was compared.When charged-discharged in 3.0-4.5 V at 1 C,the battery added HTCN exhibited capacity retention of 88.2%at 25℃after 650 cycles and 88.8%at 45℃after 450 cycles.Electrochemical impedance spectroscopy showed that the decomposition of electrolyte and material damage were inhibited by the addition of ADN and HTCN,the overall effect of HTCN was better than that of ADN.Chronoamperometry and scanning electron microscopy showed that the decomposition of the electrolyte was inhibited by the addition of ADN and HTCN,both of them had equivalent effect.X-ray photoelectron spectroscopy and inductively coupled plasma-atomic emission spectroscopy(ICP-AES)showed that both ADN and HTCN could form films on the surface of lithium cobaltate,the deposition amount of Co on the anode and separator from the battery with HTCN was about 1/2 of that of the battery with ADN.
作者
李健辉
邱景伟
范伟贞
赵经纬
LI Jian-hui;QIU Jing-wei;FAN Wei-zhen;ZHAO Jing-wei(Guangzhou Tinci Materials Technology Co.,Ltd.,Guangzhou,Guangdong 510760,China)
出处
《电池》
CAS
北大核心
2023年第1期48-51,共4页
Battery Bimonthly
