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磷酸鐵鋰電池的性能特點(diǎn)

2022-11-08

磷酸鐵鋰電池

磷酸鐵鋰電池是指以磷酸鐵鋰為正極材料的鋰離子電池。鋰離子電池正極材料種類(lèi)繁多,主要有鋰鉆酸、錳酸鋰、鎳酸鋰、三元材料、磷酸鐵鋰等。其中,鋰鉆酸是目前大多數(shù)鋰離子電池使用的正極材料,而其他正極材料由于各種原因尚未在市場(chǎng)上批量生產(chǎn)。磷酸鐵鋰電池也是鋰離子電池之一。就材料原理而言,磷酸鐵鋰也是一種嵌入/脫嵌過(guò)程。這個(gè)原理與鉆酸鋰和錳酸鋰完全相同。

磷酸鐵鋰電池的性能特點(diǎn):

(1) 高能量密度

磷酸鐵鋰的理論比容量為170 mAh/g,產(chǎn)品的實(shí)際比容量可超過(guò)140 mAh/g(0.2C,25 ℃);

(2) 安全

磷酸鐵鋰是目前安全的鋰離子電池正極材料; 不含任何對(duì)人體有害的重金屬元素;

(3) 壽命長(zhǎng)

在100% DOD條件下,可充放電2000次以上;磷酸鐵鋰晶格穩(wěn)定性好,鋰離子的插層和脫層對(duì)晶格影響不大,因而具有良好的可逆性,缺點(diǎn)是電子離子轉(zhuǎn)移速率差,不適用于大電流充放電,在應(yīng)用中受阻。解決方案: 在電極表面涂覆導(dǎo)電材料并摻雜電極改性。

(4) 無(wú)記憶效應(yīng)

(5) 充電性能

以磷酸鐵鋰為正極材料的鋰電池可以進(jìn)行較大的充電,快1小時(shí)內(nèi)可以使電池充滿(mǎn)電。


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