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鋰電池隔膜抗穿刺性能檢驗(yàn)方法

2022-07-28

鋰電池

鋰電池隔膜作為正負(fù)電極的隔離材料是鋰電池的必要組成部分。隔膜材料的性能直接影響到電池的安全性和成本。

隨著科學(xué)技術(shù)的進(jìn)步和環(huán)保意識(shí)的日益提高,鋰離子電池具有工作電壓高、能量密度大、循環(huán)壽命長(zhǎng)、自放電率小、污染低、無(wú)記憶效應(yīng)等優(yōu)勢(shì),廣泛應(yīng)用于手機(jī)、筆記本電腦、平板電腦、數(shù)碼相機(jī)、電動(dòng)汽車、航空航天、導(dǎo)航、衛(wèi)星、小型醫(yī)療等領(lǐng)域。

抗穿刺性是評(píng)價(jià)隔膜材料性能的重要機(jī)械指標(biāo),它能有效反映隔膜在裝配過(guò)程中是否容易短路。將混合的活性物質(zhì)、炭黑、增塑劑和PVDF均勻地涂覆在金屬箔上,制成鋰電池電極后經(jīng)過(guò)高溫真空干燥,其表面由混合的活性物質(zhì)和炭黑顆粒而形成的不均勻結(jié)構(gòu),因此夾在隔膜內(nèi)的正負(fù)電極材料,需要承受很大的壓力,因此,隔膜材料應(yīng)具有較強(qiáng)的抗穿刺能力,防止鋰電池正負(fù)電極接觸造成短路。


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