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三元鋰電池和磷酸鐵鋰電池哪個更好?

2023-02-22



鋰電池的使用越來越廣泛。很多朋友經(jīng)常會問,三元鋰電池好不好?磷酸鐵鋰電池哪個更好?

讓我們具體比較一下:

三元鋰電池全稱為“三元材料鋰離子電池”,一般指使用錳酸鎳鈷鋰或鋁酸鎳鈷(NCA)三元正極材料的鋰電池。鎳鹽、鈷鹽和錳鹽按三種不同的成分比例進行不同的調(diào)整,因此通常被稱為“三元”,包括多種不同比例的電池。標(biāo)稱電壓為3.6-3.8V,充電截止電壓約為4.2V。

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三元鋰電池的特點是能量密度高,電壓更高,因此同等重量電池組的電池容量更大,汽車可以跑得更遠(yuǎn)更快。然而,它的弱點在于點穩(wěn)定性差。如果內(nèi)部短路或陰極材料遇到水,則會發(fā)生明火。鋰三元材料的化學(xué)反應(yīng)會更強烈,它會釋放氧分子。在高溫的作用下,電解液會迅速燃燒,產(chǎn)生連鎖反應(yīng)。簡單來說,三元鋰材料比磷酸鐵鋰材料更容易點燃。

磷酸鐵鋰電池是使用磷酸鐵鋰(LiFePO4)作為正極材料和碳作為負(fù)極材料的鋰離子電池。單體的額定電壓為3.2V,充電截止電壓為3.6V~3.65V。磷酸鐵鋰晶體中的P-O鍵穩(wěn)定,因此在零電壓下儲存時不會發(fā)生泄漏。在高溫或過度充電條件下,安全性非常高。它可以快速充電,放電功率高,無記憶效應(yīng),循環(huán)壽命長。缺點是低溫性能差、正極材料的振動密度低、能量密度低,并且產(chǎn)品產(chǎn)量和一致性也受到質(zhì)疑。在高溫下,鋰三元電池的三元材料會在200℃分解,而磷酸鋰電池的分解溫度為800℃,具有更好的高溫性能和更高的安全性。

三元鋰電池:高電壓平臺(標(biāo)稱電壓3.6V-3.8V)、高能量密度(相同體積下三元鋰蓄電池的容量更高),使用三元鋰的電動汽車往往里程更長。然而,高溫性能較差,相對安全性較差;

磷酸鐵鋰電池:高溫性能好,相對安全性高,循環(huán)壽命長(三元鋰電池的循環(huán)壽命為500-1000次,磷酸鐵鋰的循環(huán)壽命是2000-3000次)。然而,低能量密度和低溫性能;


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