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首页> 外文期刊>Electrochimica Acta >Effect of milling method and time on the properties and electrochemical performance of LiFePO_4/C composites prepared by ball milling and thermal treatment
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Effect of milling method and time on the properties and electrochemical performance of LiFePO_4/C composites prepared by ball milling and thermal treatment

机译：研磨方法和时间对球磨和热处理制备的LiFePO_4 / C复合材料性能和电化学性能的影响

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摘要

Effects of ball milling way and time on the phase formation, particulate morphology, carbon content, and consequent electrode performance of LiFePO_4/C composite, prepared by high-energy ball milling of Li_2CO_3, NH_4H_2PO_4, FeC_2O_4 raw materials with citric acid as organic carbon source followed by thermal treatment, were investigated. Three ball milling ways and five different milling durations varied from 0 to 8 h were compared. LiFePO_4/C composites could be obtained from all synthesis processes. TEM examinations demonstrated LiFePO_4/C from ball milling in acetone resulted in sphere shape grains with a size of ～60 nm, similar size was observed for LiFePO_4/C from dry ball milling but in a more irregular shape. The ball milling in benzene resulted in a much larger size of ～250 nm. The LiFePO_4/C composites prepared from dry ball milling and ball milling in acetone showed much better electrochemical performance than that from ball milling in benzene. SEM examinations and BET measurements demonstrated that the high-energy ball milling effectively reduced the grain size. A ball milling for 4h resulted in the best electrochemical performance, likely due to the proper amount of carbon and proper carbon structure were created.
机译：球磨方式和时间对以柠檬酸为有机碳源的高能球磨Li_2CO_3，NH_4H_2PO_4，FeC_2O_4原料制备的LiFePO_4 / C复合材料的相形成，颗粒形貌，碳含量及后续电极性能的影响随后进行热处理，进行了研究。比较了三种球磨方式以及从0到8 h的五种不同的研磨时间。 LiFePO_4 / C复合材料可以从所有合成过程中获得。 TEM检查表明，在丙酮中球磨得到的LiFePO_4 / C产生了约60 nm的球形颗粒，从干球磨得到的LiFePO_4 / C观察到了相似的大小，但形状更加不规则。在苯中进行球磨得到的粒径大得多，约为250 nm。干法球磨和丙酮球磨制备的LiFePO_4 / C复合材料的电化学性能比苯球磨更好。 SEM检查和BET测量表明，高能球磨有效地减小了晶粒尺寸。球磨4h可获得最佳的电化学性能，这可能是由于产生了适量的碳和适当的碳结构所致。

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