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動力鋰電池哪個好?

2022-07-05

鋰電池

在生活中,常見的動力鋰電池的正極材料有錳酸鋰、磷酸鐵鋰和鎳鉆錳酸鋰三元材料,那么這幾種材料,哪種好呢?

磷酸鐵鋰電池的優(yōu)點:

1、安全性高:磷酸鐵鋰中的P-O鍵穩(wěn)定且不易分解,其在高溫環(huán)境下不會與鈷酸鋰一樣導(dǎo)致結(jié)構(gòu)崩塌或者生成強(qiáng)氧化性產(chǎn)物,其安全性高。

2、長壽命:鉛酸電池的循環(huán)壽命約為300次,高可達(dá)500次,磷酸鐵鋰動力電池的循環(huán)壽命為2000次以上,標(biāo)準(zhǔn)充電(5小時率)可達(dá)2000次。

3、高溫性能好:磷酸鐵鋰電熱峰值可達(dá)350℃-500℃,而錳鋰和鈷鋰僅在200℃左右。

4、容量大:當(dāng)電池不斷充電時,其容量會迅速下降到額定容量以下,這種現(xiàn)象稱為記憶效應(yīng)。和鎳氫電池一樣,鎳鎘電池也有記憶功能,而磷酸鐵鋰電池則沒有這種現(xiàn)象,隨用隨充。

5、重量輕:相同規(guī)格容量的磷酸鐵鋰電池為鉛酸電池體積的2/3、重量的1/3。

6、環(huán)保:磷酸鐵鋰電池一般認(rèn)為不含任何重金屬和稀有金屬(鎳氫電池需要稀有金屬),無毒(SGS認(rèn)證通過),無污染,符合歐洲RoHS規(guī)定。

磷酸鐵鋰電池的缺點:

低溫性能較差,正極材料振動密度小,等容量磷酸鐵鋰電池的體積比鈷酸鋰等鋰離子電池大,因此在微電池方面不具備優(yōu)勢。在動力電池方面,磷酸鐵鋰電池和其他電池一樣,面臨著同樣的電池一致性問題。

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