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[求助] 锂硫电池计时电流测试问题-电流有大量锯齿且随时间上升

我装的电池是2025锂对锂,中间为PP隔膜与改性PP隔膜,两侧分别加入商用电解液与含有LiTFSI和LiNO3的0.05M Li2S8电解液。计时电流参数为阶跃电位10mV,每个点记录时间为1s或0.1s,但电流均出现锯齿,且电流随时间推移上升,请问是哪里的问题呢?
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