摘要
本文系统介绍了不同晶体类型的FePO_(4)的制备方法,包括异磷铁锰矿FePO_(4),以及无定形、单斜和正交晶系的FePO_(4)·2H_(2)O和α-石英晶系FePO_(4),并比较了它们的电化学性能。异磷铁锰矿只在LiFePO_(4)脱Li的过程获得。无定形、单斜和正交晶系的FePO_(4)·2H_(2)O可由铁盐与磷盐反应得到,其中,单斜和正交晶系均可由不定形晶型转化而获得。α-石英晶系由FePO_(4)·2H_(2)O高温脱水制备。电化学性能优异性的顺序为:异磷铁锰矿~无定形>正交>单斜>α-石英晶系。用无定形FePO_(4)·2H_(2)O制备具有优异电化学性能的LiFePO_(4)材料,是一大发展趋势。
The preparation of several crystal types of iron phosphate were systematically summarized in this paper,included ferromanganese isophosphorite FePO_(4),amorphous,monoclinic and orthorhombic FePO_(4)·2H_(2)O,and α-quartz FePO_(4).The comparation of electrochemical properties of these types were also introduced.Ferromanganese isophosphorite could be only obtained via the delithiation of LiFePO_(4).Amorphous,monoclinic and orthorhombic FePO_(4)·2H_(2)O were prepared by the reaction of iron salts with phosphorus salts.In addition,both monoclinic and orthorhombic types also could be obtained via transformation of amorphous iron phosphate.α-quartz crystals were prepared by dehydration of FePO_(4)·2H_(2)O in high temperature.The order of excellent electrochemical properties were:ferromanganeseisophosphorite~amorphous>orthorhombic>monoclinic>α-quartz crystals,respectively.Preparation of excellent electrochemical performance of LiFePO_(4) material with amorphous FePO_(4)·2H_(2)O would be the further development trend.
作者
李立平
李煜乾
LI Liping;LI Yuqian(Guangdong Guanghua Sci-tech Co.,Ltd.,Shantou 515000,China)
出处
《化工技术与开发》
CAS
2022年第8期27-32,共6页
Technology & Development of Chemical Industry
基金
广东省重点领域研发计划“新能源汽车”重大科技专项项目(2020B090919003)。
关键词
磷酸铁
晶体结构
制备
电化学性能
iron phosphate
several crystal types
preparation
electrochemical properties
作者简介
李立平(1991-),男,博士,工程师,主要从事有色金属冶金工艺研究。
