中文摘要：

近年来关于锂离子电池造成的安全问题甚至事故的报道屡见不鲜,锂离子电池的安全问题已经成为人们关注的焦点.作者用四丁基六氟磷酸铵（TBAPF6）作为锂离子电池电解液阻燃添加剂,研究发现添加了TBAPF6的电解液具有明显的阻燃效果,同时电解液电导率下降并不明显.LiCoO2/石墨全电池在添加了TBAPF6的电解液中可逆容量会略有降低,但循环稳定性更优异,这主要是由于TBAPF6添加量的增加会影响石墨电极的库仑效率,延长活化时间.对LiCoO2/石墨全电池绝热加速量热仪测试表明,添加TBAPF6对电池的燃烧有明显的抑制作用.在TBAPF6添加量为5%时,电池在300℃内自放热速率不超过0.1℃·min^-1,电池的安全性显著提高.

英文摘要：

Safety issues have been attracted more and more attentions due to the wide applications of lithium ion batteries. Introducing flame retardant additives are one of the effective strategies to improve the safety of lithium-ion batteries. In this paper, tetrabutylammonium hexafluorophosphate （TBAPF6） as a flame retardant additive was added to the electrolyte to enhance the safety of lithium ion batteries. The self-extinguishing time （SET） and ionic conductivities of electrolytes with different TBAPF6 contents were investigated. It is found that TBAPF6 dramatically reduce the flammability of the electrolyte while slightly decreasing ionic conductivities. The electrochemistry performances of graphite half cells with higher content of TBAPF6 showed poor compatibility between TBAPF6 additive and graphite anode due to the lack of stable SEI layer formation. But LiCoO2/Graphite full battery with 5% TBAPF6 showed good electrochemical performance and extraordinary thermal stability within 300℃, representing a good flame retardant additive of TBAPF6.