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磷酸鐵鋰電池材料特性缺陷

2022-09-01

磷酸鐵鋰電池

磷酸鐵鋰電池作為目前市場上受歡迎的鋰電池之一,但其在材料特性方面上具有一些缺陷,具體如下:

1、雖然單節(jié)電池的循環(huán)壽命比較長,但是電池組的壽命會因?yàn)閺S家的技術(shù)實(shí)力不同,差距較大而有所不同。電池壽命明顯低于單節(jié)電池。單個電池使用壽命較長,約為2000次,但磷酸鐵鋰電池組使用壽命較短,一般為500次左右。

2、存在安全隱患。電池制造和循環(huán)過程中會產(chǎn)生單質(zhì)鐵,鐵積聚容易刺穿電池隔膜,大幅度提高內(nèi)部短路的可能性。

3、不耐濫用。與鉛酸電池相比,正極材料導(dǎo)電性差,內(nèi)阻高。過充接受度低,啟動性能遠(yuǎn)不如鉛酸電池。

4、低溫性能差。當(dāng)溫度低于0℃時,磷酸鐵鋰電池容量下降迅速,低溫時循環(huán)性能很差。磷酸鐵鋰電池主要由正極材料、負(fù)極材料、隔膜和電解液組成。低溫環(huán)境下的磷酸鐵鋰電池具有放電電壓平臺下降、放電容量低、容量衰減快、倍率性能差等特點(diǎn)。

5、能量密度低,振動密度低。

6、同等重量體積下容量低,不適合小單體。

7、體積和重量大。

8、電導(dǎo)率差。鋰離子擴(kuò)散速度慢,充放電高,實(shí)際比容量低。


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