【摘要】 以氧化石墨为模版剂,以FeSO₄·7H₂O、H₃PO₄、LiOH·H₂O、水合肼为原料,采用水热法在185℃下分别反应2、4、6 h合成磷酸铁锂前驱体,然后高温煅烧合成新型梭形LiFePO₄/C复合锂离子电池正极材料。通过TGDSC确定高温煅烧温度为600℃,采用XRD、SEM、LAND电池测试仪等分析测试手段对材料的结构、形貌及电化学性能进行测试,发现:185℃/（4 h）水热反应的前驱体经600℃/（2 h）获得的梭形LiFePO₄/C材料具有较好的电化学性能,室温、0.2 C下,2.7⁴.2 V电压范围进行充放电测试,放电比容量达141.2 m Ah/g。更多还原

【Abstract】 Using graphite oxide as template and FeSO₄·7H₂O、H₃PO₄、LiOH·H₂O,hydraine hydrate as material,the precursor of lithium iron phosphate is synthesized for 2,4,6 h respectively at temperature of185 ℃ by hydrothermal method. Then the spindle LiFePO₄/C cathode material is obtained by high temperature calcination. High calcination temperature is 600 ℃ with confirmed by TG-DSC. The structure,morphology and electrochemical properties of materials are tested by XRD,SEM,LAND battery tester and other test methods. The results shows: the sample which synthesized by hydrothermal method at 185 ℃/4h and subsequent high temperature sintering at 600 ℃/（2h） showes excellent electrochemical performances. The discharge capacity of the sample is 141. 2 m Ah/g at room temperature,0. 2 C when a cell（LiFePO₄/C/Li） is cycled in 2. 7 4. 2 V.更多还原