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鋰離子電池的正極材料有哪些?

2022-07-18

鋰離子電池

鋰離子電池正極材料常見的有鋰鎳氧化物,鋰鈷氧化物,鋰鈦氧化物,鎳鈷多元氧化物,鋰鐵磷氧化物,鋰錳氧化物等,接下來小編將為大家詳細介紹一下:

1、鋰鈦氧化物:典型代表是鈦酸鋰,其優(yōu)點是充電快、安全性高、循環(huán)壽命高達2萬次以上,但其能量密度小、價格昂貴。

2、鋰鎳氧化物:主要代表為鎳酸鋰,其能量密度大,高達274 mah/g,是理想的鋰離子電池正極材料,但其安全性能較差,循環(huán)周期低,廠家使用其作為正極材料較少。

3、鋰錳氧化物:主要代表為錳酸鋰、高錳酸鋰,在我國資源相對豐富,是目前的研究熱點,其中LiMn2O4高能量密度高,但穩(wěn)定性低,在高溫條件下,LiMn2O4并不穩(wěn)定,但其主要優(yōu)勢明顯,產(chǎn)品無污染,安全性能好。

4、鋰鈷氧化物:主要代表為鈷酸鋰。價格高,產(chǎn)品單體的能量密度可達274mAh/g,但系統(tǒng)的能量密度只能達到138mAh/g,具有高能量密度、高價格、高功率、高商業(yè)化和高循環(huán)壽命等特點,但其價格高,鈷鹽必須進口。

5、鎳鈷多元氧化物:常見的是鎳鈷錳酸鋰和鎳鈷鋁酸鋰,其中鎳鈷鋁酸鋰相對用得少。

6、鋰鐵磷氧化物:主要代表是磷酸鐵鋰,比亞迪是使用多。產(chǎn)品性能平衡,能量密度135mAh/g,無毒無污染,循環(huán)次數(shù)不低于2000次。在零下20度和50度的高溫下,適當?shù)臏囟葘︿囯x子電池正極材料的影響也很小。作為乘用車的動力源,其安全性高。


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