隔膜扩散特性对全钒液流单电池性能的影响

Influence of membrane diffusivity on the performance of a single vanadium flow battery

为了研究隔膜扩散特性对全钒氧化还原液流单电池充放电性能的影响，利用设计的渗透池实验测定了VO^2＋和VO^2＋在两种离子交换膜中的扩散系数，约为10^-9～10^-7cm^2／s。使用扩散系数较小的离子交换膜组成的钒电池，充放电性能较好，电流效率达到90％。

In order to investigate the influence of membrane diffusivity on the charge-discharge performance of a single all vanadium redox flow battery（VRB）, the diffusion coefficients of VO^2＋ and VO^2＋ in two types of given ion exchange membranes were measured with a specific designed permeation cell,the diffusion coefficients were about 10^-9～10^-7cm^2/s. The VRB composed of the membrane with a lower diffusion ceefficient showed better charge-discharge performance, Its current efficiency approsched to 90%.