锂离子液流电池电极悬浮液的电子导电性建模及仿真

锂离子液流电池是一种新型可充电池，其电极悬浮液的电子电导率直接影响电池的充放电性能。研究针对电极颗粒为球形导电颗柱的静态电极悬浮液，通过建立电极颗粒导电网络的统计模型，分析电极颗粒连通率及平均接触数，计算其电子电导率随颗粒含量的变化关系。设计了一种导电通路搜索算法，结合电阻网络法进行计算机模拟。结果显示，当导电电极颗粒含量达16vol％左右时，电极悬浮液开始具有连续的电子导电特征。悬浮液电子电导率随电板颗粒含量的增加而增大。当导电电极颗粒含量为40vol％时，悬浮液电子电导率可达固态密实电极的50％。

Electronic Conductivity Model and Simulation of Electrode Suspension of Lithium-ion Flow Battery

Lithium-ion flow battery is a new type of green rechargeable battery.The electronic conductivity of the electrode suspensions directly affects the charge-discharge performance of battery.For the static electrode suspensions with spherical conductive particles,the particle connectivity and the average contact number were analyzed quantitatively and the dependence of the electronic conductivity on the volume fraction of electrode particles was calculated through a statistical model for the particle conductive network.Furthermore,the conductive path searching algorithm was designed to simulate the electronic conductivities of the electrode suspensions,combining with the resistance network method. The results showed that,when the volume fraction of the conductive electrode particles reaches 16% approximately, the electrode suspension has the continuous electronic conductivity.The conductivity increases with the volume fraction and it reaches about 50% of that of the compact solid electrode when the volume fraction reaches 40% .