六氟磷酸锂制备工艺的优化及电化学性能探讨研究
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摘要
以氢氧化锂、吡啶和六氟磷酸为原料,络合物解离法制备电池级六氟磷酸锂。通过正交试验的优化工艺得到六氟磷酸锂,纯度>99%。由其组装的纽扣电池充电电压平台在4.0V左右,放电电压平台在3.9V左右。在1.0C倍率下,循环20次放电比容量从134.4mAh/g下降至112.0mAh/g,容量保持率达到83.33%,循环效率平均保持在91.38%。
The method of complex dissociation was adopted to prepare LiPF_6 with battery level used lithium hydrate,pyridine and fluorophosphoric acid as the raw materials.The experiment prepared LiPF_6 with the condition by orthogonal optimization.The product can be determined as LiPF_6 with a purity of more than 99%.The recharging voltage platform of assembling button battery was about 4.0Vand discharging voltage platform was about 3.9V.The value of discharge specific capacity droped to 112.0mAh/g from 134.4mAh/g after looping 20 times under 1.0Crate,the capacity retention rate reached 83.33%,the cycle efficiency reminded at around 91.38%.
The method of complex dissociation was adopted to prepare LiPF_6 with battery level used lithium hydrate,pyridine and fluorophosphoric acid as the raw materials.The experiment prepared LiPF_6 with the condition by orthogonal optimization.The product can be determined as LiPF_6 with a purity of more than 99%.The recharging voltage platform of assembling button battery was about 4.0Vand discharging voltage platform was about 3.9V.The value of discharge specific capacity droped to 112.0mAh/g from 134.4mAh/g after looping 20 times under 1.0Crate,the capacity retention rate reached 83.33%,the cycle efficiency reminded at around 91.38%.
引文
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[2]张拯,崔芒伟,蒋海炜,等.锂离子电池复合负极材料研究进展[J].化工新型材料,2014,42(7):18-20.
[3]饶蕾,李萌,余仲宝,等.六氟磷酸锂浓度对锂离子电池性能的影响[J].电池,2015,45(1):6-9.
[4]Kim Y S,Jeoung T H,Nam S P,et al.Structural and electrical properties of lithium-ion rechargeable battery using the LiFePO4/carbon cathode material[J].Journal of Nanoscience and Nanotechnology,2015,15(3):2436-2440.
[5]Ohe M,Yonezawa S,Kim J H,et al.Preparation of LiPF6using ClF3below room temperature[J].Journal of Fluorine Chemistry,2014,161(1):11-14.
[6]薛旭金.国内外高性能六氟磷酸锂性能分析[J].无机盐工业,2014,46(3):1-4.
[7]付豪,陈俊彩,李宣丽,等.六氟磷酸锂的纯化[J].化工进展,2013,32(11):2675-2678.
[8]徐行.六氟磷酸锂的制备及其乙腈配合物的研究[D].长沙:中南大学,2013.