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lake688123

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[求助] 关于碳基材料超电的问题

刚接触超电领域,遇到点问题,请教下:
目前在做自支撑碳基超电材料,直接把碳化后的材料用铂电极夹住测试,1A/g电容在280F/g,但是大电流下5A/g时, iR在250mV左右,压降很大;把同样的材料按照粉末碳材料去测试时,1A/g电容只有110F/g,大电流下5A/g时, iR在100mV左右,同样的材料,一种是直接测试,一种是磨成粉,为什么能性差距这么大,有没有虫友遇到这样的问题,是我材料本身有问题,还是样品处理及测试中出现问题了,麻烦虫友解答下,万分感谢!
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