掺铝氧化锌包覆LiFePO4的合成与性能（英文）

以简单的固相法合成了橄榄石结构LiFePO4,并以导电掺铝氧化锌材料(AZO)对其表面进行包覆。充放电结果显示,表面包覆大幅度改善了LiFePO4材料的倍率和低温性能。在20C高倍率条件下,AZO包覆LiFePO4的放电比容量可达100.9mA·h/g;在低温20°C时进行0.2C充放电,未包覆LiFePO4和AZO包覆LiFePO4的放电比容量分别为50.3mA·h/g和119.4mA·h/g。经分析,这可能是由于采用导电AZO包覆措施而增加了LiFePO4材料的电导率,从而极大地提高了其比容量。另外,导电AZO包覆措施还增加了LiFePO4材料的振实密度。这些结果表明AZO包覆LiFePO4材料是一种很好的适用于锂离子动力电池的正极材料。

Synthesis and characterization of LiFePO4 coating with aluminum doped zinc oxide

Aluminum doped zinc oxide (AZO), as an electrically conductive material, was applied to coating on the surface of olivine-type LiFePO₄ synthesized by solid-state method. The charge-discharge test results show that the rate performance and low-temperature performance of LiFePO₄ are greatly improved by the surface treatment. Even at 20C rate, the discharge specific capacity of 100.9 mA·h/g was obtained by the AZO-coated LiFePO₄ at room temperature. At ?20 °C, the discharge specific capacity at 0.2C for un-coated LiFePO₄ and the coated one are 50.3 mA·h/g and 119.4 mA·h/g, respectively. It should be attributed to the electrically conductive AZO-coating which increases the electronic conductivity of LiFePO₄. Furthermore, the surface-coating increases the tap-density of LiFePO₄. The results indicate that the AZO-coated LiFePO₄ is a good candidate of cathode material for applying in lithium power batteries.