Effect of milling method and time on the properties and electrochemical performance of LiFePO4/C composites prepared by ball milling and thermal treatment
Effect of milling method and time on the properties and electrochemical performance of LiFePO4/C composites prepared by ball milling and thermal treatment
复制标题
球磨方式和时间对球磨和热处理制备的LiFePO4/C复合材料性能和电化学性能的影响
DOI：
10.1016/j.electacta.2009.12.023
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发表时间：
2010-03-01
影响因子：
6.6
通讯作者：
Ma, Zi-Feng
中科院分区：
文献类型：
--
作者：
Zhang, Di;Cai, Rui;Ma, Zi-Feng
以Li 2CO 3、NH 4 H2 PO 4、FeC 2 O 4为原料，柠檬酸为有机碳源，采用高能球磨法制备了LiFePO 4/C复合材料，研究了球磨方式和球磨时间对复合材料的物相形成、颗粒形貌、碳含量及电极性能的影响。比较了3种球磨方式和5种不同的球磨时间（0 ~ 8h）。所有合成工艺均可得到LiFePO 4/C复合材料。TEM观察表明，在丙酮中球磨的LiFePO 4/C导致球形颗粒，其尺寸接近60 nm，观察到干球磨的LiFePO 4/C的类似尺寸，但形状更不规则。在苯中球磨导致类似于250 nm的大得多的尺寸。采用干法球磨和丙酮中球磨制备的LiFePO 4/C复合材料的电化学性能明显优于苯中球磨制备的LiFePO 4/C复合材料。SEM和BET测试表明，高能球磨有效地降低了晶粒尺寸。球磨4 h导致最佳的电化学性能，这可能是由于产生了适当量的碳和适当的碳结构。(C)2009爱思唯尔有限公司保留所有权利。
Effects of ball milling way and time on the phase formation, particulate morphology, carbon content, and consequent electrode performance of LiFePO4/C composite, prepared by high-energy ball milling of Li2CO3, NH4H2PO4, FeC2O4 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. LiFePO4/C composites could be obtained from all synthesis processes. TEM examinations demonstrated LiFePO4/C from ball milling in acetone resulted in sphere shape grains with a size of similar to 60 nm, similar size was observed for LiFePO4/C from dry ball milling but in a more irregular shape. The ball milling in benzene resulted in a much larger size of similar to 250 nm. The LiFePO4/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 4 h resulted in the best electrochemical performance, likely due to the proper amount of carbon and proper carbon structure were created. (C) 2009 Elsevier Ltd. All rights reserved.