王华丹,陈富金,贡纬华,苏毅.共沉淀法制备磷酸铁锂的热处理过程研究[J].有色金属(冶炼部分),2019(11):75-80.
共沉淀法制备磷酸铁锂的热处理过程研究
Study on Heat Treatment Process of Preparation of Lithium Iron Phosphate by Coprecipitation Method
投稿时间:2019-06-17  修订日期:2019-06-20
DOI:doi:10.3969/j.issn.1007-7545.2019.11.016
中文关键词:  共沉淀法  磷酸铁锂  前驱体  热处理
英文关键词:coprecipitation method  lithium iron phosphate  precursor  heat treatment
基金项目:国家自然科学基金资助项目(21666015)
           
作者单位
王华丹 昆明理工大学化学工程学院
陈富金 昆明理工大学化学工程学院
贡纬华 昆明理工大学化学工程学院
苏毅 昆明理工大学化学工程学院
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中文摘要:
      以硫酸亚铁、磷酸、氢氧化锂为原料,通过共沉淀法合成磷酸铁锂前驱体,再经过焙烧得到高倍率性能磷酸铁锂复合材料(LiFePO4/C)。研究了前驱体焙烧过程中温度对样品形貌及电化学性能的影响。结果表明:产出物相为磷酸铁锂,颗粒呈现较好的球形形貌,750 ℃煅烧得到的样品显示出最高的电化学性能,电导率为5.10 S/m,振实密度为1.19 g/cm3,在0.1C倍率下首次放电比容量达145.8 mAh/g,内阻为139.64 Ω,循环伏安曲线上下对称,有很好的循环可逆性。
英文摘要:
      Lithium iron phosphate precursor was synthesized by coprecipitation method applying ferrous sulfate, phosphoric acid and lithium hydroxide as raw materials. High-rate lithium iron phosphate composite material (LiFePO4/C) was obtained after calcination. Effects of temperature on morphology and electrochemical properties of precursor during calcination were studied. The results show that the output phase calcined at 750 ℃ is lithium iron phosphate with good spherical morphology and has the best electrochemical performance with conductivity of 5.10 S/m, tap density of 1.19 g/cm3, and the first discharge specific capacity of 145.8 mAh/g at 0.1C rate. Its internal resistance is 139.64 Ω, cyclic volt-ampere curve is up and down in symmetrical with good cycle reversibility.
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