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鈦酸鋰作鋰電池負(fù)極效果怎么樣?

2022-08-15

鋰電池

鈦酸鋰因其零應(yīng)變特性成為聚合物鋰電池的優(yōu)良負(fù)極材料,但其導(dǎo)電性差、鋰離子擴(kuò)散率低限制了其廣泛應(yīng)用。純鈦酸鋰的低Li擴(kuò)散系數(shù)和低電導(dǎo)率(10-10s /cm)導(dǎo)致聚合物鋰電池在大電流快速充放電時(shí)容量迅速衰減,因此對(duì)其進(jìn)行改性是十分必要的。鈦酸鋰的改性方法包括納米化、形貌控制、碳包覆、金屬摻雜和氮化處理。

鈦酸鋰是由過渡金屬鈦和低電位金屬鋰組成的復(fù)合氧化物。它是固溶體體系的成員。其晶體結(jié)構(gòu)為尖晶石型,空間晶格群為Fd3m,晶胞參數(shù)為0.836nm,具有鋰離子的三維擴(kuò)散通道。

控制鈦酸鋰的形貌,可以提高納米材料的離子導(dǎo)電性和電導(dǎo)率,但在循環(huán)過程中納米顆粒的團(tuán)聚會(huì)對(duì)循環(huán)的穩(wěn)定性產(chǎn)生負(fù)面影響,所以如何獲得相對(duì)穩(wěn)定的球形納米材料以及如何固化這種結(jié)構(gòu)是納米顆粒的發(fā)展方向。

鈦酸鋰作為鋰離子電池的負(fù)極材料,其制備方法主要有高溫相法、水熱法和溶膠-凝膠法,鈦酸鋰材料的改性對(duì)其性能的提高具有重要意義,通過材料的高倍放大可以提高納米級(jí)材料的性能,并且隨著電解液在碳材料表面與鈦酸鋰化合物的反應(yīng)增加,可以提高鈦酸鋰材料的導(dǎo)電性,石墨烯材料與鈦酸鋰化合物可以得到具有良好化學(xué)性能的導(dǎo)電復(fù)合材料。


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