A novel and low-cost iron source for synthesizing Cl-doped LiFePO4/C cathode materials for lithium-ion batteries
A novel and low-cost iron source for synthesizing Cl-doped LiFePO4/C cathode materials for lithium-ion batteries
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一种用于合成锂离子电池用 Cl 掺杂 LiFePO4/C 正极材料的新型低成本铁源
DOI：
10.1016/j.jelechem.2019.113434
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发表时间：
2019
影响因子：
4.5
通讯作者：
Ya-hui Zhang
中科院分区：
文献类型：
--
作者：
Huan Liu;Shao-hua Luo;Sheng-xue Yan;Ya-feng Wang;QingWang;Ming-qi Li;Ya-hui Zhang
通过正交实验确定了合成LFP/C正极材料的最佳实验条件（烧结时间为4 h，烧结温度为650°C，柠檬酸和酸洗氧化铁红的质量分数为80.25%）。为了进一步提高锂离子电池的电化学性能，以酸洗氧化铁红和柠檬酸分别为铁源和碳源，采用高温固相法成功合成了Cl掺杂的LiFePO 4/C正极材料。实验结果表明，以氧化铁红为原料，采用酸洗法制备LiFePO 4/C正极材料是降低生产成本的一种切实可行的方法。Cl的掺杂可以有效地改变LiFePO 4的微观结构，改善其结构稳定性，提高其倍率性能、循环性能和离子扩散速率。Cl掺杂LiFePO 4/C电极在0.1C下的初始容量为164.1 mAh g-1，约为理论容量的96.53（170 mAhg-1）。Cl掺杂的LiFePO 4/C电极材料在10 ℃下循环500次后，可逆容量达到105.3mAh g-1，容量留存率为91.5%，这远高于未掺杂的LiFePO 4/C电极材料（62.7%）。
The optimal experimental conditions (sintering time is 4h, the sintering temperature is 650°C, and the mass percentage of citric acid and pickled iron oxide red is 80.25%) for the synthesis of LFP/C cathode materials were determined by orthogonal experiments. To further improve electrochemical performance, Cl-doped LiFePO4/C cathode material was successfully synthesized by high-temperature solid phase method using pickling iron oxide red and citric acid as the iron source and carbon source, respectively. The experimental results reveal that it is a practical method to prepare LiFePO4/C cathode material by pickling iron oxide red as raw material to reduce production cost. It is also proved that Cl doping can effectively change the microstructure, improve.the structural stability and improve its rate performance, cycle performance and ion diffusion rate of LiFePO4. The initial capacity of Cl-doped LiFePO4/C electrode achieves 164.1 mAh g −1 at 0.1C, which is about 96.53% of thetheoreticalcapacity (170mAhg−1 ).The Cl-doped LiFePO4/C electrode material can achieve the reversible capacity of 105.3 mAh g−1 with the capacity retention rate of 91.5% after 500 cycles at 10C, which is much higher than that of undoped LiFePO4/C (62.7%) electrode materials.