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如何設(shè)置鋰電池的正負(fù)極配比?

2022-05-21

鋰電池

合理設(shè)置鋰電池正極、負(fù)極的配比系數(shù)是設(shè)計電池時經(jīng)常面臨的問題,今天小編就來為大家詳細(xì)講解這一問題。

鋰電池的正負(fù)極配比,其實也是指負(fù)極的用量要多少才是合適的,量過多,就會浪費,就需要提高正極的容量,量少,就會有析鋰的問題,正極容量難以發(fā)揮,也就是人們常說的低容。

CB=單位面積負(fù)極容量/單位面積正極容量,CB值取決于以下三點:

1、活性物質(zhì)的首次效率;

2、涂層精度;

3、正循環(huán)和負(fù)循環(huán)的衰減率。

如果涂層精度可以達(dá)到100%,且正電極效率大于負(fù)電極首次效率,則CB值理論上可以接近1。但由于負(fù)電極的衰減一般大于正電極的衰減,故CB值仍需提高。

鋰電池的正極材料以鋰鉆為例,設(shè)計容量140mAh/g(鋰鉆首次效率一般為95%),負(fù)極材料為人造石墨,設(shè)計容量340mAh/g(人造石墨首次效率一般為90%);假設(shè)涂層精度偏差為2.5%,CB值大于1.05即為0K。如果加上循環(huán)損失,則CB值設(shè)置為1.08就足夠了。因為正極效率大于負(fù)極的效率,首次正極的容量可以接受負(fù)極,不會導(dǎo)致離子盈余,只需要考慮涂層準(zhǔn)確性和循環(huán)衰減。如果正極效率低于負(fù)極效率,鋰電池在次充電時,正極釋放出大量的離子,而負(fù)極無法接受,所以必須增大CB值。


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