钠电池隔膜的孔径大小对电池性能有什么影响？

How does separator pore size affect the performance of sodium-ion batteries?

商用隔膜标准孔径 0.02-0.1μm，同步调控倍率、自放电与安全三大性能。孔径偏大时电解液浸润快，钠离子阻力低，快充、大功率放电表现突出，但大孔洞无法阻隔正负极碎屑、铝箔毛刺，长期存放自放电飙升，模组压差持续扩大。孔径偏小阻隔能力强，杂质难以穿透，存储稳定性好，但离子通道狭窄浸润缓慢，高倍率充电极化发热严重，缩短循环寿命。行业主流采用小孔径、高孔隙陶瓷隔膜，在保留充足离子通道基础上提升孔径均匀度与机械强度，平衡动力输出与长期安全，全面适配户用储能、工商业储能、低速电动车各类应用场景。

Commercial separators adopt a standard pore size of 0.02–0.1 μm, regulating rate capability, self-discharge and safety simultaneously. Larger pores accelerate electrolyte infiltration and lower sodium ion resistance for superior fast-charging and high-power performance, yet fail to block electrode debris and aluminum burrs, leading to soaring self-discharge and widening module voltage gaps during long storage. Small pores provide strong isolation against impurities and stable storage performance, but narrow ion channels slow infiltration, triggering severe polarization and heat generation under high rates to shorten cycle life. The mainstream industrial solution is small-pore, high-porosity ceramic separators. They boost pore uniformity and mechanical strength while retaining sufficient ion channels, balancing power output and long-term safety for household energy storage, commercial storage and low-speed electric vehicles.