LiFePO₄ (LFP) has been recommended as a promising cathode material due to its excellent cycle performance and high safety. However, the poor performance of low temperatures restricts the development and application of LFP cathode. Herein, the electrochemical properties of the previously synthesized LFP/C-P composite with carbon coating and phosphorus doping are discussed in the low temperature. In the low-temperature environment of − 40 °C, the first discharge-specific capacity of the LFP/C-P composite cathode at 0.1 C can reach 82.7 mAh g⁻¹, while discharge-specific capacity of pristine commercial LFP is only 72.2 mAh g⁻¹. To further improve the electrochemical performance of LFP/C-P at low temperatures, different charging-discharging methods were compared. It is noted that prolonging the constant voltage charging time can further improve the electrochemical performance of the cell, which increases the discharge capacity of LFP/C-P to 85.8 mAh g⁻¹. The LFP/C-P composite cathode therefore not only ameliorates the poor electrochemical performance of LFP but provides a new way to broaden its application range.

中文翻译：

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基于磷掺杂碳网络的LFP / CP复合材料低温电化学性能研究

LiFePO ₄（LFP）由于其出色的循环性能和高安全性而被推荐为有前途的正极材料。但是，低温性能差限制了LFP阴极的开发和应用。在此，在低温下讨论了先前合成的具有碳涂层和磷掺杂的LFP / CP复合材料的电化学性能。在− 40°C的低温环境下，LFP / CP复合阴极在0.1 C时的首次放电比容量可以达到82.7 mAh g ^-1，而原始商用LFP的放电比容量仅为72.2 mAh g ^-1。为了进一步提高LFP / CP在低温下的电化学性能，比较了不同的充放电方法。注意，延长恒定电压充电时间可以进一步改善电池的电化学性能，这将LFP / CP的放电容量增加至85.8mAh g ^-1。因此，LFP / CP复合阴极不仅改善了LFP较差的电化学性能，而且为扩大其应用范围提供了新途径。