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鋰電池的電解質(zhì)哪種更好用?

2022-07-08

鋰電池

了解鋰電極在dn基電解液中的優(yōu)異性能對(duì)提高商用鋰電池的性能具有重要意義,它是目前報(bào)道的好的金屬鋰電池電解液體系,可用于商用鋰電池。

在以DN為基礎(chǔ)的電解液中,鋰的循環(huán)效率高,沉積形貌光滑,這主要是由于鋰在以DN為基礎(chǔ)的電解液中,其表面的I膜主要由一些離子成分如HCOOLi、CH3CH20CH20Li (DN還原產(chǎn)物)、LiF和LixAsFy(鋰還原產(chǎn)物)和DN (DN還原產(chǎn)物)的低聚物組成。DN的低聚物不溶于電解質(zhì),由于含有OLi+ 邊基團(tuán)而與鋰電極表面結(jié)合。由于鋰電極的SEI膜中含有彈性成分,因此鋰電極表面的EI膜具有很強(qiáng)的柔性。因此,當(dāng)鋰在該電解質(zhì)體系中沉積或溶解時(shí),可以更好地適應(yīng)金屬鋰的體積變化,從而為鋰沉積提供更好的鈍化作用。

充放電電流密度對(duì)鋰電極性能的影響及容量衰減機(jī)理鋰電極表面始終覆蓋著一層由Li20-LiOH組成的原始膜,當(dāng)它浸沒在DW基電解液中,仍然具有一定的穩(wěn)定性。當(dāng)它以較低的速率放電時(shí),原始薄膜不會(huì)迅速變化,而是保持部分穩(wěn)定。隨后,鋰電極的表面變得非常不均勻,因?yàn)橹挥幸徊糠咒嚤砻媾c電解質(zhì)的組成發(fā)生反應(yīng),而另一部分保留了原來的表面化合物。在這種情況下,鋰電極表面不均勻,導(dǎo)致鋰不均勻沉積,加速鋰的腐蝕,電池整體性能在循環(huán)壽命方面變差。

當(dāng)鋰離子電池系統(tǒng)高速放電時(shí),覆蓋在原始表面薄膜上的鋰會(huì)迅速耗盡,從而使表面變得非常不穩(wěn)定,并迅速被由溶劑還原產(chǎn)物組成的SEI薄膜所取代,因此鋰的沉積過程可能非常均勻,鋰的沉積形貌相對(duì)光滑。

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