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  • 锂电池对隔膜有什么要求
  • 本站编辑:杭州极速电子跑狗网发布日期:2019-05-08 09:10 浏览次数:

对隔膜的要求包括:

(1)具有电子绝缘性,保证正负极的机械隔离;

 

(2)孔隙率保证低的电阻和高的离子电导率,对锂离子有很好的透过性;

 

(3)电解质的溶剂为强极性的有机化合物,有足够的化学和电化学稳定性;

 

(4)具有良好的电解液的浸润性,并且吸液保湿能力强;

 

跑狗网 (5)力学稳定性高,包括穿刺强度、拉伸强度等,但厚度尽可能小;

 

(6)空间稳定性和平整性好;

 

(7)热稳定性和自动关断保护性能好;

 

(8)受热收缩率小,否则会引起短路,引发电池热失控。除此之外,动力电池通常采用复合膜,对隔膜的要求更高。


Requirements of lithium battery for separator include:
(1) It has electronic insulation to ensure the mechanical isolation of positive and negative electrodes;

(2) Porosity ensures low resistance and high ionic conductivity, and has good permeability to lithium ions;

(3) The solvent of the electrolyte is a strong polar organic compound with sufficient chemical and electrochemical stability;

(4) It has good wettability of electrolyte and strong liquid absorption and moisture retention capability;

(5) The mechanical stability is high, including puncture strength and tensile strength, but the thickness is as small as possible;

(6) good spatial stability and smoothness;

(7) Good thermal stability and automatic shutdown protection performance;

(8) The thermal shrinkage rate is small, otherwise it will cause short circuit and lead to thermal runaway of the battery. In addition, composite membranes are usually used for power batteries, which requires higher separators.

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