导电剂对LiFePO_(4)锂浆料电池性能的影响

The effect of conductive additives on electrochemical performance of LiFePO_(4)-based lithium slurry batteries

锂浆料电池由于其成本低、寿命长、容量和输出功率可独立设计等优点,在大规模储能领域具有广阔的应用前景.电极浆料作为锂浆料电池的重要组分,其导电性与流变性对电池电化学性能具有重要影响.本文以锂离子电池常用的磷酸铁锂为正极活性物质,探究了不同导电剂种类及添加量对正极浆料导电性和流变性的影响.通过对比不同正极浆料的悬浮稳定性、粘度以及导电性,确定出1.0 wt.%科琴黑添加量的浆料性能较为突出.基于该正极浆料的锂浆料流动电池能够稳定循环450 h.本工作将为锂浆料电池导电剂的选择提供指导.

Lithium slurry batteries are promising large-scale energy-storage devices because of their low cost,long life,and independent scalability of energy and power capabilities.Electrode slurry is the main component of lithium slurry batteries and its conductive and rheological properties play an important role in the electrochemical performance of batteries.Herein,the types and amounts of conductive additives on the conductivity and rheology of LiFePO_(4)-based cathode slurry were investigated.By comparing the viscosity,suspension stability and conductivity of different cathode slurries,the 1.0 wt.%LFP–KB cathode slurry displayed a better electrochemical performance.Based on this cathode slurry,the lithium slurry batteries exhibited a stable cycle performance over 450 h.This work provides a guidance to select conductive additives for lithium slurry batteries.