PAA黏结剂用于高比容量锂离子电池磷@碳负极

Application of PAA binder in high capacity phosphorus@carbon composite anode for lithium ion batteries

磷-碳复合材料用于锂离子电池负极材料,具有比容量高、安全性好、价格低廉的优点,有望应用于高比能量电池,但是其锂化前后较大的体积变化对极片工艺提出了挑战。本文探讨了聚丙烯酸(PAA)黏结剂在高比容量磷-碳复合基锂离子电池负极极片中的应用,并与PVDF黏结剂进行了比较。研究表明,PAA黏结剂制备的电极具有相对更优的极片外观和电化学性能,极片的首次库仑效率可以达到85.5%,平均循环库仑效率高达99.7%。其中黏结剂与集流体间的黏接强度是影响电极性能的主要原因。本研究有助于推动新型高比容量磷基负极的应用,为高比能量二次电池技术的研发提供理论和实验依据。

Phosphorus@carbon composite anode material has high specific capacity,good safety and low cost.It is expected to be applied to high specific energy battery,but its large volume expansion during lithiation/delithiation shows a great challenge to electrodes process.In this paper,the application of polyacrylic acid（PAA） binder in high specific capacity phosphorous based anode electrodes of lithium ion battery was discussed.The results show that the PAA binder is superior to PVDF binder for phosphorus-carbon composite electrodes according to electrochemical performance evaluation.The first cycle efficiency of the electrodes can reach 85.5%,and the average cycle capacity efficiency is as high as 99.7%.In particular,the bonding strength between the binder and the current collector is the key issue for the electrode performance.This study is helpful to promote the application of the high-capacity phosphorus-based anode and enrich the technology development of high energy density battery.