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淺談鋰離子電池的優(yōu)點和缺點

2022-05-18

鋰離子電池

一、鋰離子電池的優(yōu)點

1、電壓高。單節(jié)電池的工作電壓可達3.7-3.8V,是鎳氫電池、鎳鎘電池的三倍。

2、容量大。材料比容量可達150mAh/g以上,比能是Ni-Cd的3~4倍,Ni-MH的2~3倍。

3、循環(huán)壽命長。鋰離子電池的循環(huán)壽命可達500次以上,甚至1000次以上,磷酸鐵鋰可達2000次以上。

4、安全性能好,無污染,無記憶性能。

5、自放電低。鋰離子電池在儲存一個月后自放電率較低,約為2%,遠低于鎳鎘電池和鎳氫電池。

6、可快速充放電。1C充電容量可在30分鐘內(nèi)達到公稱容量的80%以上。磷鐵電池可以在10分鐘內(nèi)達到公稱容量的90%。

7、工作溫度范圍高,范圍為-25℃~ 45℃。

二、鋰離子電池的缺點

1、不合格率較高。約1%的聚合物鋰離子電池由于各種原因而導(dǎo)致不合格。

2、不耐過充。鋰離子電池過充電,過量嵌入的鋰離子會永久固定在晶格中,不能再次釋放,從而縮短電池壽命。

3、不耐過放電。過放電時,過多的鋰離子會使電極脫嵌,導(dǎo)致晶格坍塌,縮短壽命。

4、成本高。鋰離子電池高的生產(chǎn)成本和低的材料堆積密度不利于生產(chǎn)控制。

5、鋰離子電池需要多種保護機制。操作不當(dāng)有縮短電池使用壽命,嚴(yán)重導(dǎo)致電池爆炸,因此鋰電池需要配置多種保護機制,如防過充、防過放、過載、過熱等保護機制。


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