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研究了Na3AlF6-Al2O3-KF-LiF电解质体系中KF和LiF含量、电流密度和NaF/AlF3分子摩尔比对阴极石墨材料渗透过程的影响.结果表明,K和Na渗透到阴极碳块中形成石墨层间化合物,而Li在阴极表面生成Li2C2化合物;当钾盐含量为0～7%(ω)时,碱金属渗透深度可达28～40mm;当锂盐含量为0～7%(ω)时,渗透深度为28～15mm.此外,电解质的渗透程度还与电解工艺参数有关,随电流密度和分子比增加而增大;当锂盐含量在3%(ω)以内时,选择合适的电流密度和分子比均可减小K,Na,Li对阴极的破坏;3种金属对阴极的破坏作用随钾盐含量增加而增大.
The effect of KF and LiF content, current density and molar ratio of NaF / AlF3 molecules on the infiltration process of cathode graphite was studied in Na3AlF6-Al2O3-KF-LiF electrolyte system. The results showed that K and Na infiltrated into the cathode carbon block to form graphite layer Li2C2 compounds were formed on the cathode surface. When the content of potassium salt was 0 ~ 7% (ω), the penetration depth of alkali metal was up to 28 ~ 40mm. When the content of lithium salt was 0 ~ 7% (ω) The penetration depth is 28 ~ 15mm.In addition, the electrolyte penetration is also related to the parameters of the electrolysis process, with the current density and molecular ratio increases; when the lithium content is less than 3% (ω), select the appropriate current density and The molecular ratio can reduce the K, Na, Li damage to the cathode; the destruction of the three metals on the cathode increases with increasing potassium content.